first commit

2026-09-23 17:31:02 +05:30
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@@ -0,0 +1,5 @@
+{
+	"root": true,
+
+	"extends": "@ljharb",
+}
@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [ljharb]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: npm/es-errors
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with a single custom sponsorship URL
@@ -0,0 +1,40 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [v1.3.0](https://github.com/ljharb/es-errors/compare/v1.2.1...v1.3.0) - 2024-02-05
+
+### Commits
+
+- [New] add `EvalError` and `URIError` [`1927627`](https://github.com/ljharb/es-errors/commit/1927627ba68cb6c829d307231376c967db53acdf)
+
+## [v1.2.1](https://github.com/ljharb/es-errors/compare/v1.2.0...v1.2.1) - 2024-02-04
+
+### Commits
+
+- [Fix] add missing `exports` entry [`5bb5f28`](https://github.com/ljharb/es-errors/commit/5bb5f280f98922701109d6ebb82eea2257cecc7e)
+
+## [v1.2.0](https://github.com/ljharb/es-errors/compare/v1.1.0...v1.2.0) - 2024-02-04
+
+### Commits
+
+- [New] add `ReferenceError` [`6d8cf5b`](https://github.com/ljharb/es-errors/commit/6d8cf5bbb6f3f598d02cf6f30e468ba2caa8e143)
+
+## [v1.1.0](https://github.com/ljharb/es-errors/compare/v1.0.0...v1.1.0) - 2024-02-04
+
+### Commits
+
+- [New] add base Error [`2983ab6`](https://github.com/ljharb/es-errors/commit/2983ab65f7bc5441276cb021dc3aa03c78881698)
+
+## v1.0.0 - 2024-02-03
+
+### Commits
+
+- Initial implementation, tests, readme, type [`8f47631`](https://github.com/ljharb/es-errors/commit/8f476317e9ad76f40ad648081829b1a1a3a1288b)
+- Initial commit [`ea5d099`](https://github.com/ljharb/es-errors/commit/ea5d099ef18e550509ab9e2be000526afd81c385)
+- npm init [`6f5ebf9`](https://github.com/ljharb/es-errors/commit/6f5ebf9cead474dadd72b9e63dad315820a089ae)
+- Only apps should have lockfiles [`e1a0aeb`](https://github.com/ljharb/es-errors/commit/e1a0aeb7b80f5cfc56be54d6b2100e915d47def8)
+- [meta] add `sideEffects` flag [`a9c7d46`](https://github.com/ljharb/es-errors/commit/a9c7d460a492f1d8a241c836bc25a322a19cc043)
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Jordan Harband
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
@@ -0,0 +1,55 @@
+# es-errors <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+A simple cache for a few of the JS Error constructors.
+
+## Example
+
+```js
+const assert = require('assert');
+
+const Base = require('es-errors');
+const Eval = require('es-errors/eval');
+const Range = require('es-errors/range');
+const Ref = require('es-errors/ref');
+const Syntax = require('es-errors/syntax');
+const Type = require('es-errors/type');
+const URI = require('es-errors/uri');
+
+assert.equal(Base, Error);
+assert.equal(Eval, EvalError);
+assert.equal(Range, RangeError);
+assert.equal(Ref, ReferenceError);
+assert.equal(Syntax, SyntaxError);
+assert.equal(Type, TypeError);
+assert.equal(URI, URIError);
+```
+
+## Tests
+Simply clone the repo, `npm install`, and run `npm test`
+
+## Security
+
+Please email [@ljharb](https://github.com/ljharb) or see https://tidelift.com/security if you have a potential security vulnerability to report.
+
+[package-url]: https://npmjs.org/package/es-errors
+[npm-version-svg]: https://versionbadg.es/ljharb/es-errors.svg
+[deps-svg]: https://david-dm.org/ljharb/es-errors.svg
+[deps-url]: https://david-dm.org/ljharb/es-errors
+[dev-deps-svg]: https://david-dm.org/ljharb/es-errors/dev-status.svg
+[dev-deps-url]: https://david-dm.org/ljharb/es-errors#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/es-errors.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/es-errors.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/es-errors.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=es-errors
+[codecov-image]: https://codecov.io/gh/ljharb/es-errors/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/ljharb/es-errors/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/es-errors
+[actions-url]: https://github.com/ljharb/es-errors/actions
@@ -0,0 +1,3 @@
+declare const EvalError: EvalErrorConstructor;
+
+export = EvalError;
@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('./eval')} */
+module.exports = EvalError;
@@ -0,0 +1,3 @@
+declare const Error: ErrorConstructor;
+
+export = Error;
@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('.')} */
+module.exports = Error;
@@ -0,0 +1,80 @@
+{
+	"name": "es-errors",
+	"version": "1.3.0",
+	"description": "A simple cache for a few of the JS Error constructors.",
+	"main": "index.js",
+	"exports": {
+		".": "./index.js",
+		"./eval": "./eval.js",
+		"./range": "./range.js",
+		"./ref": "./ref.js",
+		"./syntax": "./syntax.js",
+		"./type": "./type.js",
+		"./uri": "./uri.js",
+		"./package.json": "./package.json"
+	},
+	"sideEffects": false,
+	"scripts": {
+		"prepack": "npmignore --auto --commentLines=autogenerated",
+		"prepublishOnly": "safe-publish-latest",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"pretest": "npm run lint",
+		"test": "npm run tests-only",
+		"tests-only": "nyc tape 'test/**/*.js'",
+		"posttest": "aud --production",
+		"prelint": "evalmd README.md",
+		"lint": "eslint --ext=js,mjs .",
+		"postlint": "tsc -p . && eclint check $(git ls-files | xargs find 2> /dev/null | grep -vE 'node_modules|\\.git' | grep -v dist/)",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
+	},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/ljharb/es-errors.git"
+	},
+	"keywords": [
+		"javascript",
+		"ecmascript",
+		"error",
+		"typeerror",
+		"syntaxerror",
+		"rangeerror"
+	],
+	"author": "Jordan Harband <ljharb@gmail.com>",
+	"license": "MIT",
+	"bugs": {
+		"url": "https://github.com/ljharb/es-errors/issues"
+	},
+	"homepage": "https://github.com/ljharb/es-errors#readme",
+	"devDependencies": {
+		"@ljharb/eslint-config": "^21.1.0",
+		"@types/tape": "^5.6.4",
+		"aud": "^2.0.4",
+		"auto-changelog": "^2.4.0",
+		"eclint": "^2.8.1",
+		"eslint": "^8.8.0",
+		"evalmd": "^0.0.19",
+		"in-publish": "^2.0.1",
+		"npmignore": "^0.3.1",
+		"nyc": "^10.3.2",
+		"safe-publish-latest": "^2.0.0",
+		"tape": "^5.7.4",
+		"typescript": "next"
+	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false,
+		"hideCredit": true
+	},
+	"publishConfig": {
+		"ignore": [
+			".github/workflows"
+		]
+	},
+	"engines": {
+		"node": ">= 0.4"
+	}
+}
@@ -0,0 +1,3 @@
+declare const RangeError: RangeErrorConstructor;
+
+export = RangeError;
@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('./range')} */
+module.exports = RangeError;
@@ -0,0 +1,3 @@
+declare const ReferenceError: ReferenceErrorConstructor;
+
+export = ReferenceError;
@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('./ref')} */
+module.exports = ReferenceError;
@@ -0,0 +1,3 @@
+declare const SyntaxError: SyntaxErrorConstructor;
+
+export = SyntaxError;
@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('./syntax')} */
+module.exports = SyntaxError;
@@ -0,0 +1,19 @@
+'use strict';
+
+var test = require('tape');
+
+var E = require('../');
+var R = require('../range');
+var Ref = require('../ref');
+var S = require('../syntax');
+var T = require('../type');
+
+test('errors', function (t) {
+	t.equal(E, Error);
+	t.equal(R, RangeError);
+	t.equal(Ref, ReferenceError);
+	t.equal(S, SyntaxError);
+	t.equal(T, TypeError);
+
+	t.end();
+});
@@ -0,0 +1,49 @@
+{
+	"compilerOptions": {
+		/* Visit https://aka.ms/tsconfig.json to read more about this file */
+
+		/* Projects */
+
+		/* Language and Environment */
+		"target": "es5",																	/* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
+		// "lib": [],																				/* Specify a set of bundled library declaration files that describe the target runtime environment. */
+		// "noLib": true,																		/* Disable including any library files, including the default lib.d.ts. */
+		"useDefineForClassFields": true,										 /* Emit ECMAScript-standard-compliant class fields. */
+		// "moduleDetection": "auto",												/* Control what method is used to detect module-format JS files. */
+
+		/* Modules */
+		"module": "commonjs",																/* Specify what module code is generated. */
+		// "rootDir": "./",																	/* Specify the root folder within your source files. */
+		// "moduleResolution": "node",											 /* Specify how TypeScript looks up a file from a given module specifier. */
+		// "baseUrl": "./",																	/* Specify the base directory to resolve non-relative module names. */
+		// "paths": {},																			/* Specify a set of entries that re-map imports to additional lookup locations. */
+		// "rootDirs": [],																	 /* Allow multiple folders to be treated as one when resolving modules. */
+		// "typeRoots": ["types"],													 /* Specify multiple folders that act like `./node_modules/@types`. */
+		"resolveJsonModule": true,													 /* Enable importing .json files. */
+		// "allowArbitraryExtensions": true,								 /* Enable importing files with any extension, provided a declaration file is present. */
+
+		/* JavaScript Support */
+		"allowJs": true,																		 /* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files. */
+		"checkJs": true,																		 /* Enable error reporting in type-checked JavaScript files. */
+		"maxNodeModuleJsDepth": 1,													 /* Specify the maximum folder depth used for checking JavaScript files from `node_modules`. Only applicable with `allowJs`. */
+
+		/* Emit */
+		"declaration": true,																 /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+		"declarationMap": true,															/* Create sourcemaps for d.ts files. */
+		"noEmit": true,																			/* Disable emitting files from a compilation. */
+
+		/* Interop Constraints */
+		"allowSyntheticDefaultImports": true,								/* Allow `import x from y` when a module doesn't have a default export. */
+		"esModuleInterop": true,														 /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
+		"forceConsistentCasingInFileNames": true,						/* Ensure that casing is correct in imports. */
+
+		/* Type Checking */
+		"strict": true,																			/* Enable all strict type-checking options. */
+
+		/* Completeness */
+		// "skipLibCheck": true															/* Skip type checking all .d.ts files. */
+	},
+	"exclude": [
+		"coverage",
+	],
+}
@@ -0,0 +1,3 @@
+declare const TypeError: TypeErrorConstructor
+
+export = TypeError;
@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('./type')} */
+module.exports = TypeError;
@@ -0,0 +1,3 @@
+declare const URIError: URIErrorConstructor;
+
+export = URIError;
@@ -0,0 +1,4 @@
+'use strict';
+
+/** @type {import('./uri')} */
+module.exports = URIError;
@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [ljharb]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: npm/hasown
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with a single custom sponsorship URL
@@ -0,0 +1,13 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"lines": 86,
+	"statements": 85.93,
+	"functions": 82.43,
+	"branches": 76.06,
+	"exclude": [
+		"coverage",
+		"test"
+	]
+}
@@ -0,0 +1,51 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [v2.0.3](https://github.com/inspect-js/hasOwn/compare/v2.0.2...v2.0.3) - 2026-04-17
+
+### Commits
+
+- [actions] update workflows [`fb837b8`](https://github.com/inspect-js/hasOwn/commit/fb837b849bcdb8416fdc8fd344edfacd5574696c)
+- [Dev Deps] update `@arethetypeswrong/cli`, `@ljharb/eslint-config`, `@ljharb/tsconfig`, `@types/tape`, `auto-changelog`, `eslint`, `mock-property`, `npmignore`, `tape` [`f4b279b`](https://github.com/inspect-js/hasOwn/commit/f4b279bd682be34b3f0ede2a58d4e8acb58d6d47)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`; migrate to flat config [`7e415ce`](https://github.com/inspect-js/hasOwn/commit/7e415cee55ebf43b3c34d7fd86db73a9928b05f7)
+- [Dev Deps] update `eslint` [`ef313da`](https://github.com/inspect-js/hasOwn/commit/ef313da342d33b60e23e738b9f5a86f6065f39ef)
+- [meta] use `npm audit` instead of `aud` [`d5c6d4d`](https://github.com/inspect-js/hasOwn/commit/d5c6d4d7a19c6ca4f14ac173b30d8bf25abcabee)
+- [types] add overload that narrows the key [`cc03a09`](https://github.com/inspect-js/hasOwn/commit/cc03a097e9402fb8b86d413050e67f790dd6c8c5)
+
+## [v2.0.2](https://github.com/inspect-js/hasOwn/compare/v2.0.1...v2.0.2) - 2024-03-10
+
+### Commits
+
+- [types] use shared config [`68e9d4d`](https://github.com/inspect-js/hasOwn/commit/68e9d4dab6facb4f05f02c6baea94a3f2a4e44b2)
+- [actions] remove redundant finisher; use reusable workflow [`241a68e`](https://github.com/inspect-js/hasOwn/commit/241a68e13ea1fe52bec5ba7f74144befc31fae7b)
+- [Tests] increase coverage [`4125c0d`](https://github.com/inspect-js/hasOwn/commit/4125c0d6121db56ae30e38346dfb0c000b04f0a7)
+- [Tests] skip `npm ls` in old node due to TS [`01b9282`](https://github.com/inspect-js/hasOwn/commit/01b92822f9971dea031eafdd14767df41d61c202)
+- [types] improve predicate type [`d340f85`](https://github.com/inspect-js/hasOwn/commit/d340f85ce02e286ef61096cbbb6697081d40a12b)
+- [Dev Deps] update `tape` [`70089fc`](https://github.com/inspect-js/hasOwn/commit/70089fcf544e64acc024cbe60f5a9b00acad86de)
+- [Tests] use `@arethetypeswrong/cli` [`50b272c`](https://github.com/inspect-js/hasOwn/commit/50b272c829f40d053a3dd91c9796e0ac0b2af084)
+
+## [v2.0.1](https://github.com/inspect-js/hasOwn/compare/v2.0.0...v2.0.1) - 2024-02-10
+
+### Commits
+
+- [types] use a handwritten d.ts file; fix exported type [`012b989`](https://github.com/inspect-js/hasOwn/commit/012b9898ccf91dc441e2ebf594ff70270a5fda58)
+- [Dev Deps] update `@types/function-bind`, `@types/mock-property`, `@types/tape`, `aud`, `mock-property`, `npmignore`, `tape`, `typescript` [`977a56f`](https://github.com/inspect-js/hasOwn/commit/977a56f51a1f8b20566f3c471612137894644025)
+- [meta] add `sideEffects` flag [`3a60b7b`](https://github.com/inspect-js/hasOwn/commit/3a60b7bf42fccd8c605e5f145a6fcc83b13cb46f)
+
+## [v2.0.0](https://github.com/inspect-js/hasOwn/compare/v1.0.1...v2.0.0) - 2023-10-19
+
+### Commits
+
+- revamped implementation, tests, readme [`72bf8b3`](https://github.com/inspect-js/hasOwn/commit/72bf8b338e77a638f0a290c63ffaed18339c36b4)
+- [meta] revamp package.json [`079775f`](https://github.com/inspect-js/hasOwn/commit/079775fb1ec72c1c6334069593617a0be3847458)
+- Only apps should have lockfiles [`6640e23`](https://github.com/inspect-js/hasOwn/commit/6640e233d1bb8b65260880f90787637db157d215)
+
+## v1.0.1 - 2023-10-10
+
+### Commits
+
+- Initial commit [`8dbfde6`](https://github.com/inspect-js/hasOwn/commit/8dbfde6e8fb0ebb076fab38d138f2984eb340a62)
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) Jordan Harband and contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
@@ -0,0 +1,40 @@
+# hasown <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+A robust, ES3 compatible, "has own property" predicate.
+
+## Example
+
+```js
+const assert = require('assert');
+const hasOwn = require('hasown');
+
+assert.equal(hasOwn({}, 'toString'), false);
+assert.equal(hasOwn([], 'length'), true);
+assert.equal(hasOwn({ a: 42 }, 'a'), true);
+```
+
+## Tests
+Simply clone the repo, `npm install`, and run `npm test`
+
+[package-url]: https://npmjs.org/package/hasown
+[npm-version-svg]: https://versionbadg.es/inspect-js/hasown.svg
+[deps-svg]: https://david-dm.org/inspect-js/hasOwn.svg
+[deps-url]: https://david-dm.org/inspect-js/hasOwn
+[dev-deps-svg]: https://david-dm.org/inspect-js/hasOwn/dev-status.svg
+[dev-deps-url]: https://david-dm.org/inspect-js/hasOwn#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/hasown.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/hasown.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/hasown.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=hasown
+[codecov-image]: https://codecov.io/gh/inspect-js/hasOwn/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/inspect-js/hasOwn/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/hasOwn
+[actions-url]: https://github.com/inspect-js/hasOwn/actions
@@ -0,0 +1,6 @@
+import ljharbConfig from '@ljharb/eslint-config/flat';
+
+export default [
+	...ljharbConfig,
+	{ rules: { 'no-extra-parens': 'off' } },
+];
@@ -0,0 +1,4 @@
+declare function hasOwn<O, K extends PropertyKey>(o: O, p: K): p is K & keyof O;
+declare function hasOwn<O, K extends PropertyKey, V = unknown>(o: O, p: K): o is O & Record<K, V>;
+
+export = hasOwn;
@@ -0,0 +1,8 @@
+'use strict';
+
+var call = Function.prototype.call;
+var $hasOwn = Object.prototype.hasOwnProperty;
+var bind = require('function-bind');
+
+/** @type {import('.')} */
+module.exports = bind.call(call, $hasOwn);
@@ -0,0 +1,92 @@
+{
+	"name": "hasown",
+	"version": "2.0.3",
+	"description": "A robust, ES3 compatible, \"has own property\" predicate.",
+	"main": "index.js",
+	"exports": {
+		".": "./index.js",
+		"./package.json": "./package.json"
+	},
+	"types": "index.d.ts",
+	"sideEffects": false,
+	"scripts": {
+		"prepack": "npmignore --auto --commentLines=autogenerated",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"prepublishOnly": "safe-publish-latest",
+		"prelint": "evalmd README.md",
+		"lint": "eslint .",
+		"postlint": "npm run tsc",
+		"pretest": "npm run lint",
+		"tsc": "tsc -p .",
+		"posttsc": "attw -P",
+		"tests-only": "nyc tape 'test/**/*.js'",
+		"test": "npm run tests-only",
+		"posttest": "npx npm@\">= 10.2\" audit --production",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
+	},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/inspect-js/hasOwn.git"
+	},
+	"keywords": [
+		"has",
+		"hasOwnProperty",
+		"hasOwn",
+		"has-own",
+		"own",
+		"has",
+		"property",
+		"in",
+		"javascript",
+		"ecmascript"
+	],
+	"author": "Jordan Harband <ljharb@gmail.com>",
+	"license": "MIT",
+	"bugs": {
+		"url": "https://github.com/inspect-js/hasOwn/issues"
+	},
+	"homepage": "https://github.com/inspect-js/hasOwn#readme",
+	"dependencies": {
+		"function-bind": "^1.1.2"
+	},
+	"devDependencies": {
+		"@arethetypeswrong/cli": "^0.18.2",
+		"@ljharb/eslint-config": "^22.2.2",
+		"@ljharb/tsconfig": "^0.3.2",
+		"@types/function-bind": "^1.1.10",
+		"@types/tape": "^5.8.1",
+		"auto-changelog": "^2.5.0",
+		"encoding": "^0.1.13",
+		"eslint": "^10.2.0",
+		"evalmd": "^0.0.19",
+		"in-publish": "^2.0.1",
+		"jiti": "^0.0.0",
+		"mock-property": "^1.1.0",
+		"npmignore": "^0.3.5",
+		"nyc": "^10.3.2",
+		"safe-publish-latest": "^2.0.0",
+		"tape": "^5.9.0",
+		"typescript": "next"
+	},
+	"engines": {
+		"node": ">= 0.4"
+	},
+	"testling": {
+		"files": "test/index.js"
+	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false,
+		"hideCredit": true
+	},
+	"publishConfig": {
+		"ignore": [
+			".github/workflows",
+			"test"
+		]
+	}
+}
@@ -0,0 +1,6 @@
+{
+  "extends": "@ljharb/tsconfig",
+  "exclude": [
+    "coverage",
+  ],
+}
@@ -0,0 +1,5 @@
+{
+	"ignoreRules": [
+		"named-exports"
+	]
+}
@@ -0,0 +1,20 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 150
+
+[CHANGELOG.md]
+indent_style = space
+indent_size = 2
+
+[*.json]
+max_line_length = off
+
+[Makefile]
+max_line_length = off
@@ -0,0 +1,11 @@
+{
+	"root": true,
+
+	"extends": "@ljharb",
+
+	"rules": {
+		"max-params": [2, 3],
+		"new-cap": [2, { "capIsNewExceptions": ["GetIntrinsic"] }],
+		"no-magic-numbers": 0,
+	},
+}
@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [ljharb]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: npm/internal-slot
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with a single custom sponsorship URL
@@ -0,0 +1,9 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"exclude": [
+		"coverage",
+		"test"
+	]
+}
@@ -0,0 +1,114 @@
+### Changelog
+
+All notable changes to this project will be documented in this file. Dates are displayed in UTC.
+
+Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
+
+#### [v1.1.0](https://github.com/ljharb/internal-slot/compare/v1.0.7...v1.1.0)
+
+> 13 December 2024
+
+- [New] add types [`295d25d`](https://github.com/ljharb/internal-slot/commit/295d25d55cfcb6ba1dd2520b36f4270c5a613c09)
+- [actions] split out node 10-20, and 20+ [`9c9a2ab`](https://github.com/ljharb/internal-slot/commit/9c9a2ab345f0cb6d202cc92297060889e9ed5e06)
+- [Dev Deps] update `@ljharb/eslint-config`, `auto-changelog`, `object-inspect`, `tape` [`9c5621b`](https://github.com/ljharb/internal-slot/commit/9c5621bc88dd9fcf20e2347a7c26af7fdcd509a2)
+- [Deps] update `hasown`, `side-channel` [`5281391`](https://github.com/ljharb/internal-slot/commit/52813911eb534cda56e414810b6e2bfe85fa340c)
+- [Tests] replace `aud` with `npm audit` [`64ce191`](https://github.com/ljharb/internal-slot/commit/64ce191a0603f10017854cb7dc5629da2b5fca6b)
+- [Dev Deps] add missing peer dep [`d500343`](https://github.com/ljharb/internal-slot/commit/d5003432d47d7d5dced1c5c5f3543a4f1b65bb1f)
+
+#### [v1.0.7](https://github.com/ljharb/internal-slot/compare/v1.0.6...v1.0.7)
+
+> 5 February 2024
+
+- [Dev Deps] update `aud`, `npmignore`, `tape` [`89c88c1`](https://github.com/ljharb/internal-slot/commit/89c88c1ed8de7c681fd3cec7bb2f045db0268d84)
+- [Refactor] use `es-errors`, so things that only need those do not need `get-intrinsic` [`b437631`](https://github.com/ljharb/internal-slot/commit/b4376312d4a5d7bc99fb383cae3f15bd2f3d36d1)
+
+#### [v1.0.6](https://github.com/ljharb/internal-slot/compare/v1.0.5...v1.0.6)
+
+> 20 October 2023
+
+- [Dev Deps] update `@ljharb/eslint-config`, `aud`, `object-inspect`, `tape` [`4d568d2`](https://github.com/ljharb/internal-slot/commit/4d568d2897a2efe9b0604ae240bc89787924070f)
+- [Refactor] use `hasown` instead of `has` [`f946e94`](https://github.com/ljharb/internal-slot/commit/f946e94885f5fa092a4de04f366d746c0c5a2f2f)
+- [Deps] update `get-intrinsic` [`1bbc885`](https://github.com/ljharb/internal-slot/commit/1bbc885b0225dadac6e50f421cda5814c242b0bb)
+- [meta] remove unused `.eslintignore` [`6fdde1a`](https://github.com/ljharb/internal-slot/commit/6fdde1a25348cf9fc41c9808d342e6502f37658d)
+
+#### [v1.0.5](https://github.com/ljharb/internal-slot/compare/v1.0.4...v1.0.5)
+
+> 9 February 2023
+
+- [Dev Deps] update `@ljharb/eslint-config`, `aud`, `object-inspect`, `tape` [`e427703`](https://github.com/ljharb/internal-slot/commit/e427703bfc669c590a863ec77ecd3789d7b7c458)
+- [Deps] update `get-intrinsic` [`aa652f0`](https://github.com/ljharb/internal-slot/commit/aa652f05c5c15b4ed1a118be60f0565e47bd7208)
+- [Fix] improve assertion message [`8df86e3`](https://github.com/ljharb/internal-slot/commit/8df86e3ea21786b5eb7654f22202665c8b63accf)
+
+#### [v1.0.4](https://github.com/ljharb/internal-slot/compare/v1.0.3...v1.0.4)
+
+> 13 December 2022
+
+- [actions] reuse common workflows [`82a1aee`](https://github.com/ljharb/internal-slot/commit/82a1aee603bce8627930597edb3a04b4970ed151)
+- [meta] use `npmignore` to autogenerate an npmignore file [`56f7e71`](https://github.com/ljharb/internal-slot/commit/56f7e7182dd934dd6c1b80497a110670d02a91b9)
+- [actions] use `node/install` instead of `node/run`; use `codecov` action [`e25ff67`](https://github.com/ljharb/internal-slot/commit/e25ff67d568f77c1b66168957d82b080779e1c0a)
+- [actions] update rebase action to use reusable workflow [`227e81e`](https://github.com/ljharb/internal-slot/commit/227e81eaef7230a265103ef1ef0618d2920c3f30)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `auto-changelog`, `foreach`, `object-inspect`, `tape` [`fc9f319`](https://github.com/ljharb/internal-slot/commit/fc9f319d136ddf2e79910390d1e7ad279d41cc01)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `auto-changelog`, `object-inspect`, `safe-publish-latest`, `tape` [`0a72a0f`](https://github.com/ljharb/internal-slot/commit/0a72a0f389511b41645f441da19257a266cb37f7)
+- [actions] update codecov uploader [`e2b993f`](https://github.com/ljharb/internal-slot/commit/e2b993f143278a30424ebd5526019e59828989d0)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `object-inspect`, `tape` [`8f0ab80`](https://github.com/ljharb/internal-slot/commit/8f0ab808afdd458001c35c828962dc714d824754)
+- [actions] update checkout action [`8da4b91`](https://github.com/ljharb/internal-slot/commit/8da4b91c3454671da2e53a831ca0928147965a09)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `@safe-publish-latest`, `tape` [`7ab37aa`](https://github.com/ljharb/internal-slot/commit/7ab37aabf01ded2605fa583a9866b62172f82e30)
+- [readme] add github actions/codecov badges [`71234be`](https://github.com/ljharb/internal-slot/commit/71234bef4ef99e2f17d72ae3a1b7c0522519b7d7)
+- [Fix] `assert`: throw on a nonexistent slot even when an object already has other slots [`12580bd`](https://github.com/ljharb/internal-slot/commit/12580bd26fe9f8603566e9e076092b5e1fb7340b)
+- [Tests] use `for-each` instead of `foreach` [`7229df0`](https://github.com/ljharb/internal-slot/commit/7229df01666ccb022dde82686d84b97b7bcfc53a)
+- [meta] use `prepublishOnly` script for npm 7+ [`8728872`](https://github.com/ljharb/internal-slot/commit/8728872cfbd735d3ae87e885c081a08d5b26edf0)
+- [Deps] update `get-intrinsic` [`1b7088f`](https://github.com/ljharb/internal-slot/commit/1b7088fa970c33757816b08357814bdbf6d722b6)
+- [Deps] update `get-intrinsic` [`063621e`](https://github.com/ljharb/internal-slot/commit/063621ec99d1b9262d3898c0ecad0e1e98be5f75)
+
+#### [v1.0.3](https://github.com/ljharb/internal-slot/compare/v1.0.2...v1.0.3)
+
+> 26 January 2021
+
+- [Tests] use shared travis-ci configs [`0ef2263`](https://github.com/ljharb/internal-slot/commit/0ef22634fa2269d9df0d784aca3c5748e8eabd3b)
+- [Tests] migrate tests to Github Actions [`6253915`](https://github.com/ljharb/internal-slot/commit/6253915d28721df2eda5630849bc6b57647e3ee2)
+- [meta] do not publish github action workflow files [`ef94e55`](https://github.com/ljharb/internal-slot/commit/ef94e555727ed6a649ef64010904fe89a468d459)
+- [Tests] run `nyc` on all tests; use `tape` runner [`917d6ca`](https://github.com/ljharb/internal-slot/commit/917d6ca630cdcd6b4da9a2c300c6a3abb6e724fe)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `auto-changelog`, `object-inspect`, `tape` [`8dcb6fe`](https://github.com/ljharb/internal-slot/commit/8dcb6fe01d6a45e1af17a9dace95ca47c99b4328)
+- [actions] add "Allow Edits" workflow [`7aa3e86`](https://github.com/ljharb/internal-slot/commit/7aa3e86edb0149fd882717481885760aeb28474e)
+- [Refactor] use `get-intrinsic` instead of `es-abstract`; update `side-channel` [`11ad17d`](https://github.com/ljharb/internal-slot/commit/11ad17d4255adcbc55fd4eca0bf6733bac59f1bf)
+- [readme] remove travis badge [`5b75452`](https://github.com/ljharb/internal-slot/commit/5b754523aa07e8f67d0135df75059a18047292bb)
+- [actions] switch Automatic Rebase workflow to `pull_request_target` event [`d531688`](https://github.com/ljharb/internal-slot/commit/d5316880956b4dd83e6b6c9ab48fdd8171a4a268)
+- [Dev Deps] update `@ljharb/eslint-config`, `tape` [`c76fa91`](https://github.com/ljharb/internal-slot/commit/c76fa91a7e623a738e22332bee4e985aea41122e)
+- [Dev Deps] update `eslint`, `tape` [`e733ccd`](https://github.com/ljharb/internal-slot/commit/e733ccd68e81c72ef2e02726e001895053de7887)
+- [Dev Deps] update `auto-changelog`; add `aud` [`df20bf5`](https://github.com/ljharb/internal-slot/commit/df20bf5d3943a533c20799d8cc1449997e85d53b)
+- [meta] fix autochangelog [`e89e6f1`](https://github.com/ljharb/internal-slot/commit/e89e6f1ff9f10f386e6400b586db78ad9c0f1309)
+- [Tests] only audit prod deps [`71317b9`](https://github.com/ljharb/internal-slot/commit/71317b95ec6bbd9877807da0c0316ee9f5f30fab)
+- [Deps] update `es-abstract` [`c17ccf4`](https://github.com/ljharb/internal-slot/commit/c17ccf45f4cb0d3b7a1536e9cd3a7ff9a7dafd21)
+- [Dev Deps] update `tape` [`d81ae03`](https://github.com/ljharb/internal-slot/commit/d81ae030a0e8f58cee00f752601ce60405a93d78)
+- [Deps] update `es-abstract` [`b56303b`](https://github.com/ljharb/internal-slot/commit/b56303b4c3af7a510f9f51860895a46fd2e14752)
+- [Deps] update `es-abstract` [`9996d1c`](https://github.com/ljharb/internal-slot/commit/9996d1cf3507750c7a6845a2fb0d0f849ea898a1)
+
+#### [v1.0.2](https://github.com/ljharb/internal-slot/compare/v1.0.1...v1.0.2)
+
+> 20 December 2019
+
+- [Deps] update `es-abstract`, `side-channel` [`5c9df03`](https://github.com/ljharb/internal-slot/commit/5c9df03a25518f5c482cff4e1447a26fa071df9a)
+- [Dev Deps] update `@ljharb/eslint-config`, `tape` [`7820f98`](https://github.com/ljharb/internal-slot/commit/7820f984e523a64ddf3068c4e5631abf61eb1ea4)
+
+#### [v1.0.1](https://github.com/ljharb/internal-slot/compare/v1.0.0...v1.0.1)
+
+> 1 December 2019
+
+- [Refactor] use `side-channel` package [`d38639f`](https://github.com/ljharb/internal-slot/commit/d38639f0a3cdb5090711179d0e78df857ecbd5d3)
+- [actions] add automatic rebasing / merge commit blocking [`74267e6`](https://github.com/ljharb/internal-slot/commit/74267e6e591e18ba39186cb99139d3fd7a757c9f)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `auto-changelog`, `object-inspect`, `safe-publish-latest` [`b042eef`](https://github.com/ljharb/internal-slot/commit/b042eefc067b830bbd370833f7f21754e802b0b2)
+- [Deps] update `es-abstract` [`98cf4e8`](https://github.com/ljharb/internal-slot/commit/98cf4e86c1bfe99eda7b11a8ea70394368f33e4f)
+
+#### v1.0.0
+
+> 20 October 2019
+
+- Tests [`b50fa41`](https://github.com/ljharb/internal-slot/commit/b50fa41b6f47aba39ac4cb733658580974a0b00a)
+- implementation [`c5a59f3`](https://github.com/ljharb/internal-slot/commit/c5a59f3753677f81aa12a0226d3b1187846d06dd)
+- Initial commit [`15ebe4d`](https://github.com/ljharb/internal-slot/commit/15ebe4dc6d46885f67969d64c9c3e705780963f8)
+- readme [`382a3f5`](https://github.com/ljharb/internal-slot/commit/382a3f53d8975e6488373a0fc2abcdc7c4c44247)
+- npm init [`d5e7c97`](https://github.com/ljharb/internal-slot/commit/d5e7c977ef694e89c245fd11165f63c06a7a5040)
+- [meta] add FUNDING.yml [`685b608`](https://github.com/ljharb/internal-slot/commit/685b6087613f6735f4411a558500d92f8a3ec3f2)
+- [meta] add `auto-changelog`, `safe-publish-latest` [`f8fdf1c`](https://github.com/ljharb/internal-slot/commit/f8fdf1c3f0c592f71746da6d7f8bea18f8946dda)
+- [Tests] add `npm run lint` [`baaaa09`](https://github.com/ljharb/internal-slot/commit/baaaa09ab6e5bc5fcc0e7c76e10c55aa18f4ca7e)
+- Only apps should have lockfiles [`dfa7efa`](https://github.com/ljharb/internal-slot/commit/dfa7efa3d5cd23261cb75c2adab6ee3c06790fee)
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 Jordan Harband
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
@@ -0,0 +1,58 @@
+# internal-slot <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![dependency status][deps-svg]][deps-url]
+[![dev dependency status][dev-deps-svg]][dev-deps-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+Truly private storage, akin to the JS spec’s concept of internal slots.
+
+Uses a WeakMap when available; a Map when not; and a regular object in even older engines. Performance and garbage collection behavior will reflect the environment’s capabilities accordingly.
+
+## Example
+
+```js
+var SLOT = require('internal-slot');
+var assert = require('assert');
+
+var o = {};
+
+assert.throws(function () { SLOT.assert(o, 'foo'); });
+
+assert.equal(SLOT.has(o, 'foo'), false);
+assert.equal(SLOT.get(o, 'foo'), undefined);
+
+SLOT.set(o, 'foo', 42);
+
+assert.equal(SLOT.has(o, 'foo'), true);
+assert.equal(SLOT.get(o, 'foo'), 42);
+
+assert.doesNotThrow(function () { SLOT.assert(o, 'foo'); });
+```
+
+## Tests
+Simply clone the repo, `npm install`, and run `npm test`
+
+## Security
+
+Please email [@ljharb](https://github.com/ljharb) or see https://tidelift.com/security if you have a potential security vulnerability to report.
+
+[package-url]: https://npmjs.org/package/internal-slot
+[npm-version-svg]: https://versionbadg.es/ljharb/internal-slot.svg
+[deps-svg]: https://david-dm.org/ljharb/internal-slot.svg
+[deps-url]: https://david-dm.org/ljharb/internal-slot
+[dev-deps-svg]: https://david-dm.org/ljharb/internal-slot/dev-status.svg
+[dev-deps-url]: https://david-dm.org/ljharb/internal-slot#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/internal-slot.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/internal-slot.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/internal-slot.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=internal-slot
+[codecov-image]: https://codecov.io/gh/ljharb/internal-slot/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/ljharb/internal-slot/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/internal-slot
+[actions-url]: https://github.com/ljharb/internal-slot/actions
@@ -0,0 +1,12 @@
+declare namespace SLOT {
+	type InternalSlot = string; // `[[${string}]]`; // TODO: restrict this to require the brackets
+}
+
+declare const SLOT: {
+	assert(O: object, slot: SLOT.InternalSlot): void;
+	get(O: object, slot: SLOT.InternalSlot): unknown;
+	set(O: object, slot: SLOT.InternalSlot, value?: unknown): void;
+	has(O: object, slot: SLOT.InternalSlot): boolean;
+}
+
+export = SLOT;
@@ -0,0 +1,69 @@
+'use strict';
+
+/** @typedef {`$${import('.').InternalSlot}`} SaltedInternalSlot */
+/** @typedef {{ [k in SaltedInternalSlot]?: unknown }} SlotsObject */
+
+var hasOwn = require('hasown');
+/** @type {import('side-channel').Channel<object, SlotsObject>} */
+var channel = require('side-channel')();
+
+var $TypeError = require('es-errors/type');
+
+/** @type {import('.')} */
+var SLOT = {
+	assert: function (O, slot) {
+		if (!O || (typeof O !== 'object' && typeof O !== 'function')) {
+			throw new $TypeError('`O` is not an object');
+		}
+		if (typeof slot !== 'string') {
+			throw new $TypeError('`slot` must be a string');
+		}
+		channel.assert(O);
+		if (!SLOT.has(O, slot)) {
+			throw new $TypeError('`' + slot + '` is not present on `O`');
+		}
+	},
+	get: function (O, slot) {
+		if (!O || (typeof O !== 'object' && typeof O !== 'function')) {
+			throw new $TypeError('`O` is not an object');
+		}
+		if (typeof slot !== 'string') {
+			throw new $TypeError('`slot` must be a string');
+		}
+		var slots = channel.get(O);
+		// eslint-disable-next-line no-extra-parens
+		return slots && slots[/** @type {SaltedInternalSlot} */ ('$' + slot)];
+	},
+	has: function (O, slot) {
+		if (!O || (typeof O !== 'object' && typeof O !== 'function')) {
+			throw new $TypeError('`O` is not an object');
+		}
+		if (typeof slot !== 'string') {
+			throw new $TypeError('`slot` must be a string');
+		}
+		var slots = channel.get(O);
+		// eslint-disable-next-line no-extra-parens
+		return !!slots && hasOwn(slots, /** @type {SaltedInternalSlot} */ ('$' + slot));
+	},
+	set: function (O, slot, V) {
+		if (!O || (typeof O !== 'object' && typeof O !== 'function')) {
+			throw new $TypeError('`O` is not an object');
+		}
+		if (typeof slot !== 'string') {
+			throw new $TypeError('`slot` must be a string');
+		}
+		var slots = channel.get(O);
+		if (!slots) {
+			slots = {};
+			channel.set(O, slots);
+		}
+		// eslint-disable-next-line no-extra-parens
+		slots[/** @type {SaltedInternalSlot} */ ('$' + slot)] = V;
+	}
+};
+
+if (Object.freeze) {
+	Object.freeze(SLOT);
+}
+
+module.exports = SLOT;
@@ -0,0 +1,79 @@
+{
+	"name": "internal-slot",
+	"version": "1.1.0",
+	"description": "ES spec-like internal slots",
+	"main": "index.js",
+	"scripts": {
+		"prepack": "npmignore --auto --commentLines=autogenerated",
+		"prepublishOnly": "safe-publish-latest",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\"",
+		"pretest": "npm run lint",
+		"lint": "eslint --ext=js,mjs .",
+		"postlint": "tsc && attw -P",
+		"tests-only": "nyc tape 'test/**/*.js'",
+		"test": "npm run tests-only",
+		"posttest": "npx npm@'>= 10.2' audit --production"
+	},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/ljharb/internal-slot.git"
+	},
+	"keywords": [
+		"internal",
+		"slot",
+		"internal slot",
+		"ecmascript",
+		"es",
+		"spec",
+		"private",
+		"data",
+		"private data",
+		"weakmap"
+	],
+	"author": "Jordan Harband <ljharb@gmail.com>",
+	"license": "MIT",
+	"bugs": {
+		"url": "https://github.com/ljharb/internal-slot/issues"
+	},
+	"homepage": "https://github.com/ljharb/internal-slot#readme",
+	"engines": {
+		"node": ">= 0.4"
+	},
+	"devDependencies": {
+		"@arethetypeswrong/cli": "^0.17.1",
+		"@ljharb/eslint-config": "^21.1.1",
+		"@ljharb/tsconfig": "^0.2.2",
+		"@types/for-each": "^0.3.3",
+		"@types/object-inspect": "^1.13.0",
+		"@types/tape": "^5.6.5",
+		"auto-changelog": "^2.5.0",
+		"encoding": "^0.1.13",
+		"eslint": "=8.8.0",
+		"for-each": "^0.3.3",
+		"in-publish": "^2.0.1",
+		"npmignore": "^0.3.1",
+		"nyc": "^10.3.2",
+		"object-inspect": "^1.13.3",
+		"safe-publish-latest": "^2.0.0",
+		"tape": "^5.9.0",
+		"typescript": "next"
+	},
+	"dependencies": {
+		"es-errors": "^1.3.0",
+		"hasown": "^2.0.2",
+		"side-channel": "^1.1.0"
+	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false
+	},
+	"publishConfig": {
+		"ignore": [
+			".github/workflows"
+		]
+	}
+}
@@ -0,0 +1,129 @@
+'use strict';
+
+var test = require('tape');
+var inspect = require('object-inspect');
+var forEach = require('for-each');
+
+var SLOT = require('../');
+
+test('assert', function (t) {
+	forEach([null, undefined, true, false, 'foo', '', 42, 0], function (primitive) {
+		t['throws'](
+			// @ts-expect-error
+			function () { SLOT.assert(primitive, ''); },
+			TypeError,
+			inspect(primitive) + ' is not an Object'
+		);
+	});
+
+	forEach([null, undefined, true, false, 42, 0, {}, [], function () {}, /a/g], function (nonString) {
+		t['throws'](
+			// @ts-expect-error
+			function () { SLOT.assert({}, nonString); },
+			TypeError,
+			inspect(nonString) + ' is not a String'
+		);
+	});
+
+	t['throws'](
+		function () { SLOT.assert({}, '[[whatever]]'); },
+		TypeError,
+		'nonexistent slot throws'
+	);
+
+	var o = {};
+	SLOT.set(o, 'x');
+	t.doesNotThrow(function () { SLOT.assert(o, 'x'); }, 'existent slot noops');
+	t['throws'](function () { SLOT.assert(o, 'y'); }, 'thing with a slot throws on a nonexistent slot');
+
+	t.end();
+});
+
+test('has', function (t) {
+	forEach([null, undefined, true, false, 'foo', '', 42, 0], function (primitive) {
+		t['throws'](
+			// @ts-expect-error
+			function () { SLOT.has(primitive, ''); },
+			TypeError,
+			inspect(primitive) + ' is not an Object'
+		);
+	});
+
+	forEach([null, undefined, true, false, 42, 0, {}, [], function () {}, /a/g], function (nonString) {
+		t['throws'](
+			// @ts-expect-error
+			function () { SLOT.has({}, nonString); },
+			TypeError,
+			inspect(nonString) + ' is not a String'
+		);
+	});
+
+	var o = {};
+
+	t.equal(SLOT.has(o, '[[nonexistent]]'), false, 'nonexistent slot yields false');
+
+	SLOT.set(o, 'foo');
+	t.equal(SLOT.has(o, 'foo'), true, 'existent slot yields true');
+
+	t.end();
+});
+
+test('get', function (t) {
+	forEach([null, undefined, true, false, 'foo', '', 42, 0], function (primitive) {
+		t['throws'](
+			// @ts-expect-error
+			function () { SLOT.get(primitive, ''); },
+			TypeError,
+			inspect(primitive) + ' is not an Object'
+		);
+	});
+
+	forEach([null, undefined, true, false, 42, 0, {}, [], function () {}, /a/g], function (nonString) {
+		t['throws'](
+			// @ts-expect-error
+			function () { SLOT.get({}, nonString); },
+			TypeError,
+			inspect(nonString) + ' is not a String'
+		);
+	});
+
+	var o = {};
+	t.equal(SLOT.get(o, 'nonexistent'), undefined, 'nonexistent slot is undefined');
+
+	var v = {};
+	SLOT.set(o, 'f', v);
+	t.equal(SLOT.get(o, 'f'), v, '"get" retrieves value set by "set"');
+
+	t.end();
+});
+
+test('set', function (t) {
+	forEach([null, undefined, true, false, 'foo', '', 42, 0], function (primitive) {
+		t['throws'](
+			// @ts-expect-error
+			function () { SLOT.set(primitive, ''); },
+			TypeError,
+			inspect(primitive) + ' is not an Object'
+		);
+	});
+
+	forEach([null, undefined, true, false, 42, 0, {}, [], function () {}, /a/g], function (nonString) {
+		t['throws'](
+			// @ts-expect-error
+			function () { SLOT.set({}, nonString); },
+			TypeError,
+			inspect(nonString) + ' is not a String'
+		);
+	});
+
+	var o = function () {};
+	t.equal(SLOT.get(o, 'f'), undefined, 'slot not set');
+
+	SLOT.set(o, 'f', 42);
+	t.equal(SLOT.get(o, 'f'), 42, 'slot was set');
+
+	SLOT.set(o, 'f', Infinity);
+	t.equal(SLOT.get(o, 'f'), Infinity, 'slot was set again');
+
+	t.end();
+});
@@ -0,0 +1,9 @@
+{
+	"extends": "@ljharb/tsconfig",
+	"compilerOptions": {
+		//"target": "es2021",
+	},
+	"exclude": [
+		"coverage",
+	],
+}
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 2
+trim_trailing_whitespace = true
@@ -0,0 +1,12 @@
+{
+	"root": true,
+
+	"extends": "@ljharb",
+
+	"rules": {
+		"id-length": 0,
+		"max-lines-per-function": 0,
+		"multiline-comment-style": 1,
+		"new-cap": [2, { "capIsNewExceptions": ["GetIntrinsic"] }],
+	},
+}
@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [ljharb]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: npm/side-channel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
@@ -0,0 +1,13 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"lines": 86,
+	"statements": 85.93,
+	"functions": 82.43,
+	"branches": 76.06,
+	"exclude": [
+		"coverage",
+		"test"
+	]
+}
@@ -0,0 +1,110 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [v1.1.0](https://github.com/ljharb/side-channel/compare/v1.0.6...v1.1.0) - 2024-12-11
+
+### Commits
+
+- [Refactor] extract implementations to `side-channel-weakmap`, `side-channel-map`, `side-channel-list` [`ada5955`](https://github.com/ljharb/side-channel/commit/ada595549a5c4c6c853756d598846b180941c6da)
+- [New] add `channel.delete` [`c01d2d3`](https://github.com/ljharb/side-channel/commit/c01d2d3fd51dbb1ce6da72ad7916e61bd6172aad)
+- [types] improve types [`0c54356`](https://github.com/ljharb/side-channel/commit/0c5435651417df41b8cc1a5f7cdce8bffae68cde)
+- [readme] add content [`be24868`](https://github.com/ljharb/side-channel/commit/be248682ac294b0e22c883092c45985aa91c490a)
+- [actions] split out node 10-20, and 20+ [`c4488e2`](https://github.com/ljharb/side-channel/commit/c4488e241ef3d49a19fe266ac830a2e644305911)
+- [types] use shared tsconfig [`0e0d57c`](https://github.com/ljharb/side-channel/commit/0e0d57c2ff17c7b45c6cbd43ebcf553edc9e3adc)
+- [Dev Deps] update `@ljharb/eslint-config`, `@ljharb/tsconfig`, `@types/get-intrinsic`, `@types/object-inspect`, `@types/tape`, `auto-changelog`, `tape` [`fb4f622`](https://github.com/ljharb/side-channel/commit/fb4f622e64a99a1e40b6e5cd7691674a9dc429e4)
+- [Deps] update `call-bind`, `get-intrinsic`, `object-inspect` [`b78336b`](https://github.com/ljharb/side-channel/commit/b78336b886172d1b457d414ac9e28de8c5fecc78)
+- [Tests] replace `aud` with `npm audit` [`ee3ab46`](https://github.com/ljharb/side-channel/commit/ee3ab4690d954311c35115651bcfd45edd205aa1)
+- [Dev Deps] add missing peer dep [`c03e21a`](https://github.com/ljharb/side-channel/commit/c03e21a7def3b67cdc15ae22316884fefcb2f6a8)
+
+## [v1.0.6](https://github.com/ljharb/side-channel/compare/v1.0.5...v1.0.6) - 2024-02-29
+
+### Commits
+
+- add types [`9beef66`](https://github.com/ljharb/side-channel/commit/9beef6643e6d717ea57bedabf86448123a7dd9e9)
+- [meta] simplify `exports` [`4334cf9`](https://github.com/ljharb/side-channel/commit/4334cf9df654151504c383b62a2f9ebdc8d9d5ac)
+- [Deps] update `call-bind` [`d6043c4`](https://github.com/ljharb/side-channel/commit/d6043c4d8f4d7be9037dd0f0419c7a2e0e39ec6a)
+- [Dev Deps] update `tape` [`6aca376`](https://github.com/ljharb/side-channel/commit/6aca3761868dc8cd5ff7fd9799bf6b95e09a6eb0)
+
+## [v1.0.5](https://github.com/ljharb/side-channel/compare/v1.0.4...v1.0.5) - 2024-02-06
+
+### Commits
+
+- [actions] reuse common workflows [`3d2e1ff`](https://github.com/ljharb/side-channel/commit/3d2e1ffd16dd6eaaf3e40ff57951f840d2d63c04)
+- [meta] use `npmignore` to autogenerate an npmignore file [`04296ea`](https://github.com/ljharb/side-channel/commit/04296ea17d1544b0a5d20fd5bfb31aa4f6513eb9)
+- [meta] add `.editorconfig`; add `eclint` [`130f0a6`](https://github.com/ljharb/side-channel/commit/130f0a6adbc04d385c7456a601d38344dce3d6a9)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `auto-changelog`, `safe-publish-latest`, `tape` [`d480c2f`](https://github.com/ljharb/side-channel/commit/d480c2fbe757489ae9b4275491ffbcc3ac4725e9)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `auto-changelog`, `tape` [`ecbe70e`](https://github.com/ljharb/side-channel/commit/ecbe70e53a418234081a77971fec1fdfae20c841)
+- [actions] update rebase action [`75240b9`](https://github.com/ljharb/side-channel/commit/75240b9963b816e8846400d2287cb68f88c7fba7)
+- [Dev Deps] update `@ljharb/eslint-config`, `aud`, `npmignore`, `tape` [`ae8d281`](https://github.com/ljharb/side-channel/commit/ae8d281572430099109870fd9430d2ca3f320b8d)
+- [Dev Deps] update `@ljharb/eslint-config`, `aud`, `tape` [`7125b88`](https://github.com/ljharb/side-channel/commit/7125b885fd0eacad4fee9b073b72d14065ece278)
+- [Deps] update `call-bind`, `get-intrinsic`, `object-inspect` [`82577c9`](https://github.com/ljharb/side-channel/commit/82577c9796304519139a570f82a317211b5f3b86)
+- [Deps] update `call-bind`, `get-intrinsic`, `object-inspect` [`550aadf`](https://github.com/ljharb/side-channel/commit/550aadf20475a6081fd70304cc54f77259a5c8a8)
+- [Tests] increase coverage [`5130877`](https://github.com/ljharb/side-channel/commit/5130877a7b27c862e64e6d1c12a178b28808859d)
+- [Deps] update `get-intrinsic`, `object-inspect` [`ba0194c`](https://github.com/ljharb/side-channel/commit/ba0194c505b1a8a0427be14cadd5b8a46d4d01b8)
+- [meta] add missing `engines.node` [`985fd24`](https://github.com/ljharb/side-channel/commit/985fd249663cb06617a693a94fe08cad12f5cb70)
+- [Refactor] use `es-errors`, so things that only need those do not need `get-intrinsic` [`40227a8`](https://github.com/ljharb/side-channel/commit/40227a87b01709ad2c0eebf87eb4223a800099b9)
+- [Deps] update `get-intrinsic` [`a989b40`](https://github.com/ljharb/side-channel/commit/a989b4024958737ae7be9fbffdeff2078f33a0fd)
+- [Deps] update `object-inspect` [`aec42d2`](https://github.com/ljharb/side-channel/commit/aec42d2ec541a31aaa02475692c87d489237d9a3)
+
+## [v1.0.4](https://github.com/ljharb/side-channel/compare/v1.0.3...v1.0.4) - 2020-12-29
+
+### Commits
+
+- [Tests] migrate tests to Github Actions [`10909cb`](https://github.com/ljharb/side-channel/commit/10909cbf8ce9c0bf96f604cf13d7ffd5a22c2d40)
+- [Refactor] Use a linked list rather than an array, and move accessed nodes to the beginning [`195613f`](https://github.com/ljharb/side-channel/commit/195613f28b5c1e6072ef0b61b5beebaf2b6a304e)
+- [meta] do not publish github action workflow files [`290ec29`](https://github.com/ljharb/side-channel/commit/290ec29cd21a60585145b4a7237ec55228c52c27)
+- [Tests] run `nyc` on all tests; use `tape` runner [`ea6d030`](https://github.com/ljharb/side-channel/commit/ea6d030ff3fe6be2eca39e859d644c51ecd88869)
+- [actions] add "Allow Edits" workflow [`d464d8f`](https://github.com/ljharb/side-channel/commit/d464d8fe52b5eddf1504a0ed97f0941a90f32c15)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `auto-changelog` [`02daca8`](https://github.com/ljharb/side-channel/commit/02daca87c6809821c97be468d1afa2f5ef447383)
+- [Refactor] use `call-bind` and `get-intrinsic` instead of `es-abstract` [`e09d481`](https://github.com/ljharb/side-channel/commit/e09d481528452ebafa5cdeae1af665c35aa2deee)
+- [Deps] update `object.assign` [`ee83aa8`](https://github.com/ljharb/side-channel/commit/ee83aa81df313b5e46319a63adb05cf0c179079a)
+- [actions] update rebase action to use checkout v2 [`7726b0b`](https://github.com/ljharb/side-channel/commit/7726b0b058b632fccea709f58960871defaaa9d7)
+
+## [v1.0.3](https://github.com/ljharb/side-channel/compare/v1.0.2...v1.0.3) - 2020-08-23
+
+### Commits
+
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `aud`, `auto-changelog`, `tape` [`1f10561`](https://github.com/ljharb/side-channel/commit/1f105611ef3acf32dec8032ae5c0baa5e56bb868)
+- [Deps] update `es-abstract`, `object-inspect` [`bc20159`](https://github.com/ljharb/side-channel/commit/bc201597949a505e37cef9eaf24c7010831e6f03)
+- [Dev Deps] update `@ljharb/eslint-config`, `tape` [`b9b2b22`](https://github.com/ljharb/side-channel/commit/b9b2b225f9e0ea72a6ec2b89348f0bd690bc9ed1)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `tape` [`7055ab4`](https://github.com/ljharb/side-channel/commit/7055ab4de0860606efd2003674a74f1fe6ebc07e)
+- [Dev Deps] update `auto-changelog`; add `aud` [`d278c37`](https://github.com/ljharb/side-channel/commit/d278c37d08227be4f84aa769fcd919e73feeba40)
+- [actions] switch Automatic Rebase workflow to `pull_request_target` event [`3bcf982`](https://github.com/ljharb/side-channel/commit/3bcf982faa122745b39c33ce83d32fdf003741c6)
+- [Tests] only audit prod deps [`18d01c4`](https://github.com/ljharb/side-channel/commit/18d01c4015b82a3d75044c4d5ba7917b2eac01ec)
+- [Deps] update `es-abstract` [`6ab096d`](https://github.com/ljharb/side-channel/commit/6ab096d9de2b482cf5e0717e34e212f5b2b9bc9a)
+- [Dev Deps] update `tape` [`9dc174c`](https://github.com/ljharb/side-channel/commit/9dc174cc651dfd300b4b72da936a0a7eda5f9452)
+- [Deps] update `es-abstract` [`431d0f0`](https://github.com/ljharb/side-channel/commit/431d0f0ff11fbd2ae6f3115582a356d3a1cfce82)
+- [Deps] update `es-abstract` [`49869fd`](https://github.com/ljharb/side-channel/commit/49869fd323bf4453f0ba515c0fb265cf5ab7b932)
+- [meta] Add package.json to package's exports [`77d9cdc`](https://github.com/ljharb/side-channel/commit/77d9cdceb2a9e47700074f2ae0c0a202e7dac0d4)
+
+## [v1.0.2](https://github.com/ljharb/side-channel/compare/v1.0.1...v1.0.2) - 2019-12-20
+
+### Commits
+
+- [Dev Deps] update `@ljharb/eslint-config`, `tape` [`4a526df`](https://github.com/ljharb/side-channel/commit/4a526df44e4701566ed001ec78546193f818b082)
+- [Deps] update `es-abstract` [`d4f6e62`](https://github.com/ljharb/side-channel/commit/d4f6e629b6fb93a07415db7f30d3c90fd7f264fe)
+
+## [v1.0.1](https://github.com/ljharb/side-channel/compare/v1.0.0...v1.0.1) - 2019-12-01
+
+### Commits
+
+- [Fix] add missing "exports" [`d212907`](https://github.com/ljharb/side-channel/commit/d2129073abf0701a5343bf28aa2145617604dc2e)
+
+## v1.0.0 - 2019-12-01
+
+### Commits
+
+- Initial implementation [`dbebd3a`](https://github.com/ljharb/side-channel/commit/dbebd3a4b5ed64242f9a6810efe7c4214cd8cde4)
+- Initial tests [`73bdefe`](https://github.com/ljharb/side-channel/commit/73bdefe568c9076cf8c0b8719bc2141aec0e19b8)
+- Initial commit [`43c03e1`](https://github.com/ljharb/side-channel/commit/43c03e1c2849ec50a87b7a5cd76238a62b0b8770)
+- npm init [`5c090a7`](https://github.com/ljharb/side-channel/commit/5c090a765d66a5527d9889b89aeff78dee91348c)
+- [meta] add `auto-changelog` [`a5c4e56`](https://github.com/ljharb/side-channel/commit/a5c4e5675ec02d5eb4d84b4243aeea2a1d38fbec)
+- [actions] add automatic rebasing / merge commit blocking [`bab1683`](https://github.com/ljharb/side-channel/commit/bab1683d8f9754b086e94397699fdc645e0d7077)
+- [meta] add `funding` field; create FUNDING.yml [`63d7aea`](https://github.com/ljharb/side-channel/commit/63d7aeaf34f5650650ae97ca4b9fae685bd0937c)
+- [Tests] add `npm run lint` [`46a5a81`](https://github.com/ljharb/side-channel/commit/46a5a81705cd2664f83df232c01dbbf2ee952885)
+- Only apps should have lockfiles [`8b16b03`](https://github.com/ljharb/side-channel/commit/8b16b0305f00895d90c4e2e5773c854cfea0e448)
+- [meta] add `safe-publish-latest` [`2f098ef`](https://github.com/ljharb/side-channel/commit/2f098ef092a39399cfe548b19a1fc03c2fd2f490)
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 Jordan Harband
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
@@ -0,0 +1,61 @@
+# side-channel <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+Store information about any JS value in a side channel. Uses WeakMap if available.
+
+Warning: in an environment that lacks `WeakMap`, this implementation will leak memory until you `delete` the `key`.
+
+## Getting started
+
+```sh
+npm install --save side-channel
+```
+
+## Usage/Examples
+
+```js
+const assert = require('assert');
+const getSideChannel = require('side-channel');
+
+const channel = getSideChannel();
+
+const key = {};
+assert.equal(channel.has(key), false);
+assert.throws(() => channel.assert(key), TypeError);
+
+channel.set(key, 42);
+
+channel.assert(key); // does not throw
+assert.equal(channel.has(key), true);
+assert.equal(channel.get(key), 42);
+
+channel.delete(key);
+assert.equal(channel.has(key), false);
+assert.throws(() => channel.assert(key), TypeError);
+```
+
+## Tests
+
+Clone the repo, `npm install`, and run `npm test`
+
+[package-url]: https://npmjs.org/package/side-channel
+[npm-version-svg]: https://versionbadg.es/ljharb/side-channel.svg
+[deps-svg]: https://david-dm.org/ljharb/side-channel.svg
+[deps-url]: https://david-dm.org/ljharb/side-channel
+[dev-deps-svg]: https://david-dm.org/ljharb/side-channel/dev-status.svg
+[dev-deps-url]: https://david-dm.org/ljharb/side-channel#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/side-channel.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/side-channel.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/side-channel.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=side-channel
+[codecov-image]: https://codecov.io/gh/ljharb/side-channel/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/ljharb/side-channel/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/side-channel
+[actions-url]: https://github.com/ljharb/side-channel/actions
@@ -0,0 +1,14 @@
+import getSideChannelList from 'side-channel-list';
+import getSideChannelMap from 'side-channel-map';
+import getSideChannelWeakMap from 'side-channel-weakmap';
+
+declare namespace getSideChannel {
+	type Channel<K, V> =
+		| getSideChannelList.Channel<K, V>
+		| ReturnType<Exclude<typeof getSideChannelMap<K, V>, false>>
+		| ReturnType<Exclude<typeof getSideChannelWeakMap<K, V>, false>>;
+}
+
+declare function getSideChannel<K, V>(): getSideChannel.Channel<K, V>;
+
+export = getSideChannel;
@@ -0,0 +1,43 @@
+'use strict';
+
+var $TypeError = require('es-errors/type');
+var inspect = require('object-inspect');
+var getSideChannelList = require('side-channel-list');
+var getSideChannelMap = require('side-channel-map');
+var getSideChannelWeakMap = require('side-channel-weakmap');
+
+var makeChannel = getSideChannelWeakMap || getSideChannelMap || getSideChannelList;
+
+/** @type {import('.')} */
+module.exports = function getSideChannel() {
+	/** @typedef {ReturnType<typeof getSideChannel>} Channel */
+
+	/** @type {Channel | undefined} */ var $channelData;
+
+	/** @type {Channel} */
+	var channel = {
+		assert: function (key) {
+			if (!channel.has(key)) {
+				throw new $TypeError('Side channel does not contain ' + inspect(key));
+			}
+		},
+		'delete': function (key) {
+			return !!$channelData && $channelData['delete'](key);
+		},
+		get: function (key) {
+			return $channelData && $channelData.get(key);
+		},
+		has: function (key) {
+			return !!$channelData && $channelData.has(key);
+		},
+		set: function (key, value) {
+			if (!$channelData) {
+				$channelData = makeChannel();
+			}
+
+			$channelData.set(key, value);
+		}
+	};
+	// @ts-expect-error TODO: figure out why this is erroring
+	return channel;
+};
@@ -0,0 +1,85 @@
+{
+	"name": "side-channel",
+	"version": "1.1.0",
+	"description": "Store information about any JS value in a side channel. Uses WeakMap if available.",
+	"main": "index.js",
+	"exports": {
+		".": "./index.js",
+		"./package.json": "./package.json"
+	},
+	"types": "./index.d.ts",
+	"scripts": {
+		"prepack": "npmignore --auto --commentLines=autogenerated",
+		"prepublishOnly": "safe-publish-latest",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"prelint": "eclint check $(git ls-files | xargs find 2> /dev/null | grep -vE 'node_modules|\\.git')",
+		"lint": "eslint --ext=js,mjs .",
+		"postlint": "tsc -p . && attw -P",
+		"pretest": "npm run lint",
+		"tests-only": "nyc tape 'test/**/*.js'",
+		"test": "npm run tests-only",
+		"posttest": "npx npm@'>=10.2' audit --production",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
+	},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/ljharb/side-channel.git"
+	},
+	"keywords": [
+		"weakmap",
+		"map",
+		"side",
+		"channel",
+		"metadata"
+	],
+	"author": "Jordan Harband <ljharb@gmail.com>",
+	"funding": {
+		"url": "https://github.com/sponsors/ljharb"
+	},
+	"license": "MIT",
+	"bugs": {
+		"url": "https://github.com/ljharb/side-channel/issues"
+	},
+	"homepage": "https://github.com/ljharb/side-channel#readme",
+	"dependencies": {
+		"es-errors": "^1.3.0",
+		"object-inspect": "^1.13.3",
+		"side-channel-list": "^1.0.0",
+		"side-channel-map": "^1.0.1",
+		"side-channel-weakmap": "^1.0.2"
+	},
+	"devDependencies": {
+		"@arethetypeswrong/cli": "^0.17.1",
+		"@ljharb/eslint-config": "^21.1.1",
+		"@ljharb/tsconfig": "^0.2.2",
+		"@types/object-inspect": "^1.13.0",
+		"@types/tape": "^5.6.5",
+		"auto-changelog": "^2.5.0",
+		"eclint": "^2.8.1",
+		"encoding": "^0.1.13",
+		"eslint": "=8.8.0",
+		"in-publish": "^2.0.1",
+		"npmignore": "^0.3.1",
+		"nyc": "^10.3.2",
+		"safe-publish-latest": "^2.0.0",
+		"tape": "^5.9.0",
+		"typescript": "next"
+	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false,
+		"hideCredit": true
+	},
+	"publishConfig": {
+		"ignore": [
+			".github/workflows"
+		]
+	},
+	"engines": {
+		"node": ">= 0.4"
+	}
+}
@@ -0,0 +1,104 @@
+'use strict';
+
+var test = require('tape');
+
+var getSideChannel = require('../');
+
+test('getSideChannel', function (t) {
+	t.test('export', function (st) {
+		st.equal(typeof getSideChannel, 'function', 'is a function');
+
+		st.equal(getSideChannel.length, 0, 'takes no arguments');
+
+		var channel = getSideChannel();
+		st.ok(channel, 'is truthy');
+		st.equal(typeof channel, 'object', 'is an object');
+		st.end();
+	});
+
+	t.test('assert', function (st) {
+		var channel = getSideChannel();
+		st['throws'](
+			function () { channel.assert({}); },
+			TypeError,
+			'nonexistent value throws'
+		);
+
+		var o = {};
+		channel.set(o, 'data');
+		st.doesNotThrow(function () { channel.assert(o); }, 'existent value noops');
+
+		st.end();
+	});
+
+	t.test('has', function (st) {
+		var channel = getSideChannel();
+		/** @type {unknown[]} */ var o = [];
+
+		st.equal(channel.has(o), false, 'nonexistent value yields false');
+
+		channel.set(o, 'foo');
+		st.equal(channel.has(o), true, 'existent value yields true');
+
+		st.equal(channel.has('abc'), false, 'non object value non existent yields false');
+
+		channel.set('abc', 'foo');
+		st.equal(channel.has('abc'), true, 'non object value that exists yields true');
+
+		st.end();
+	});
+
+	t.test('get', function (st) {
+		var channel = getSideChannel();
+		var o = {};
+		st.equal(channel.get(o), undefined, 'nonexistent value yields undefined');
+
+		var data = {};
+		channel.set(o, data);
+		st.equal(channel.get(o), data, '"get" yields data set by "set"');
+
+		st.end();
+	});
+
+	t.test('set', function (st) {
+		var channel = getSideChannel();
+		var o = function () {};
+		st.equal(channel.get(o), undefined, 'value not set');
+
+		channel.set(o, 42);
+		st.equal(channel.get(o), 42, 'value was set');
+
+		channel.set(o, Infinity);
+		st.equal(channel.get(o), Infinity, 'value was set again');
+
+		var o2 = {};
+		channel.set(o2, 17);
+		st.equal(channel.get(o), Infinity, 'o is not modified');
+		st.equal(channel.get(o2), 17, 'o2 is set');
+
+		channel.set(o, 14);
+		st.equal(channel.get(o), 14, 'o is modified');
+		st.equal(channel.get(o2), 17, 'o2 is not modified');
+
+		st.end();
+	});
+
+	t.test('delete', function (st) {
+		var channel = getSideChannel();
+		var o = {};
+		st.equal(channel['delete']({}), false, 'nonexistent value yields false');
+
+		channel.set(o, 42);
+		st.equal(channel.has(o), true, 'value is set');
+
+		st.equal(channel['delete']({}), false, 'nonexistent value still yields false');
+
+		st.equal(channel['delete'](o), true, 'deleted value yields true');
+
+		st.equal(channel.has(o), false, 'value is no longer set');
+
+		st.end();
+	});
+
+	t.end();
+});
@@ -0,0 +1,9 @@
+{
+	"extends": "@ljharb/tsconfig",
+	"compilerOptions": {
+		"target": "es2021",
+	},
+	"exclude": [
+		"coverage",
+	],
+}