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# 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).
## [v1.0.1](https://github.com/es-shims/dunder-proto/compare/v1.0.0...v1.0.1) - 2024-12-16
### Commits
- [Fix] do not crash when `--disable-proto=throw` [`6c367d9`](https://github.com/es-shims/dunder-proto/commit/6c367d919bc1604778689a297bbdbfea65752847)
- [Tests] ensure noproto tests only use the current version of dunder-proto [`b02365b`](https://github.com/es-shims/dunder-proto/commit/b02365b9cf889c4a2cac7be0c3cfc90a789af36c)
- [Dev Deps] update `@arethetypeswrong/cli`, `@types/tape` [`e3c5c3b`](https://github.com/es-shims/dunder-proto/commit/e3c5c3bd81cf8cef7dff2eca19e558f0e307f666)
- [Deps] update `call-bind-apply-helpers` [`19f1da0`](https://github.com/es-shims/dunder-proto/commit/19f1da028b8dd0d05c85bfd8f7eed2819b686450)
## v1.0.0 - 2024-12-06
### Commits
- Initial implementation, tests, readme, types [`a5b74b0`](https://github.com/es-shims/dunder-proto/commit/a5b74b0082f5270cb0905cd9a2e533cee7498373)
- Initial commit [`73fb5a3`](https://github.com/es-shims/dunder-proto/commit/73fb5a353b51ac2ab00c9fdeb0114daffd4c07a8)
- npm init [`80152dc`](https://github.com/es-shims/dunder-proto/commit/80152dc98155da4eb046d9f67a87ed96e8280a1d)
- Only apps should have lockfiles [`03e6660`](https://github.com/es-shims/dunder-proto/commit/03e6660a1d70dc401f3e217a031475ec537243dd)
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MIT License
Copyright (c) 2024 ECMAScript Shims
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.
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# dunder-proto <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]
If available, the `Object.prototype.__proto__` accessor and mutator, call-bound.
## Getting started
```sh
npm install --save dunder-proto
```
## Usage/Examples
```js
const assert = require('assert');
const getDunder = require('dunder-proto/get');
const setDunder = require('dunder-proto/set');
const obj = {};
assert.equal('toString' in obj, true);
assert.equal(getDunder(obj), Object.prototype);
setDunder(obj, null);
assert.equal('toString' in obj, false);
assert.equal(getDunder(obj), null);
```
## Tests
Clone the repo, `npm install`, and run `npm test`
[package-url]: https://npmjs.org/package/dunder-proto
[npm-version-svg]: https://versionbadg.es/es-shims/dunder-proto.svg
[deps-svg]: https://david-dm.org/es-shims/dunder-proto.svg
[deps-url]: https://david-dm.org/es-shims/dunder-proto
[dev-deps-svg]: https://david-dm.org/es-shims/dunder-proto/dev-status.svg
[dev-deps-url]: https://david-dm.org/es-shims/dunder-proto#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/dunder-proto.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/dunder-proto.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/dunder-proto.svg
[downloads-url]: https://npm-stat.com/charts.html?package=dunder-proto
[codecov-image]: https://codecov.io/gh/es-shims/dunder-proto/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/es-shims/dunder-proto/
[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/dunder-proto
[actions-url]: https://github.com/es-shims/dunder-proto/actions
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declare function getDunderProto(target: {}): object | null;
declare const x: false | typeof getDunderProto;
export = x;
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'use strict';
var callBind = require('call-bind-apply-helpers');
var gOPD = require('gopd');
var hasProtoAccessor;
try {
// eslint-disable-next-line no-extra-parens, no-proto
hasProtoAccessor = /** @type {{ __proto__?: typeof Array.prototype }} */ ([]).__proto__ === Array.prototype;
} catch (e) {
if (!e || typeof e !== 'object' || !('code' in e) || e.code !== 'ERR_PROTO_ACCESS') {
throw e;
}
}
// eslint-disable-next-line no-extra-parens
var desc = !!hasProtoAccessor && gOPD && gOPD(Object.prototype, /** @type {keyof typeof Object.prototype} */ ('__proto__'));
var $Object = Object;
var $getPrototypeOf = $Object.getPrototypeOf;
/** @type {import('./get')} */
module.exports = desc && typeof desc.get === 'function'
? callBind([desc.get])
: typeof $getPrototypeOf === 'function'
? /** @type {import('./get')} */ function getDunder(value) {
// eslint-disable-next-line eqeqeq
return $getPrototypeOf(value == null ? value : $Object(value));
}
: false;
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{
"name": "dunder-proto",
"version": "1.0.1",
"description": "If available, the `Object.prototype.__proto__` accessor and mutator, call-bound",
"main": false,
"exports": {
"./get": "./get.js",
"./set": "./set.js",
"./package.json": "./package.json"
},
"sideEffects": false,
"scripts": {
"prepack": "npmignore --auto --commentLines=autogenerated",
"prepublish": "not-in-publish || npm run prepublishOnly",
"prepublishOnly": "safe-publish-latest",
"prelint": "evalmd README.md",
"lint": "eslint --ext=.js,.mjs .",
"postlint": "tsc -p . && attw -P",
"pretest": "npm run lint",
"tests-only": "nyc tape 'test/**/*.js'",
"test": "npm run tests-only",
"posttest": "npx npm@'>= 10.2' audit --production",
"version": "auto-changelog && git add CHANGELOG.md",
"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
},
"repository": {
"type": "git",
"url": "git+https://github.com/es-shims/dunder-proto.git"
},
"author": "Jordan Harband <ljharb@gmail.com>",
"license": "MIT",
"bugs": {
"url": "https://github.com/es-shims/dunder-proto/issues"
},
"homepage": "https://github.com/es-shims/dunder-proto#readme",
"dependencies": {
"call-bind-apply-helpers": "^1.0.1",
"es-errors": "^1.3.0",
"gopd": "^1.2.0"
},
"devDependencies": {
"@arethetypeswrong/cli": "^0.17.1",
"@ljharb/eslint-config": "^21.1.1",
"@ljharb/tsconfig": "^0.2.2",
"@types/tape": "^5.7.0",
"auto-changelog": "^2.5.0",
"encoding": "^0.1.13",
"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": "^5.9.0",
"typescript": "next"
},
"auto-changelog": {
"output": "CHANGELOG.md",
"template": "keepachangelog",
"unreleased": false,
"commitLimit": false,
"backfillLimit": false,
"hideCredit": true
},
"testling": {
"files": "test/index.js"
},
"publishConfig": {
"ignore": [
".github/workflows"
]
},
"engines": {
"node": ">= 0.4"
}
}
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declare function setDunderProto<P extends null | object>(target: {}, proto: P): P;
declare const x: false | typeof setDunderProto;
export = x;
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'use strict';
var callBind = require('call-bind-apply-helpers');
var gOPD = require('gopd');
var $TypeError = require('es-errors/type');
/** @type {{ __proto__?: object | null }} */
var obj = {};
try {
obj.__proto__ = null; // eslint-disable-line no-proto
} catch (e) {
if (!e || typeof e !== 'object' || !('code' in e) || e.code !== 'ERR_PROTO_ACCESS') {
throw e;
}
}
var hasProtoMutator = !('toString' in obj);
// eslint-disable-next-line no-extra-parens
var desc = gOPD && gOPD(Object.prototype, /** @type {keyof typeof Object.prototype} */ ('__proto__'));
/** @type {import('./set')} */
module.exports = hasProtoMutator && (
// eslint-disable-next-line no-extra-parens
(!!desc && typeof desc.set === 'function' && /** @type {import('./set')} */ (callBind([desc.set])))
|| /** @type {import('./set')} */ function setDunder(object, proto) {
// this is node v0.10 or older, which doesn't have Object.setPrototypeOf and has undeniable __proto__
if (object == null) { // eslint-disable-line eqeqeq
throw new $TypeError('set Object.prototype.__proto__ called on null or undefined');
}
// eslint-disable-next-line no-proto, no-param-reassign, no-extra-parens
/** @type {{ __proto__?: object | null }} */ (object).__proto__ = proto;
return proto;
}
);
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'use strict';
var test = require('tape');
var getDunderProto = require('../get');
test('getDunderProto', { skip: !getDunderProto }, function (t) {
if (!getDunderProto) {
throw 'should never happen; this is just for type narrowing'; // eslint-disable-line no-throw-literal
}
// @ts-expect-error
t['throws'](function () { getDunderProto(); }, TypeError, 'throws if no argument');
// @ts-expect-error
t['throws'](function () { getDunderProto(undefined); }, TypeError, 'throws with undefined');
// @ts-expect-error
t['throws'](function () { getDunderProto(null); }, TypeError, 'throws with null');
t.equal(getDunderProto({}), Object.prototype);
t.equal(getDunderProto([]), Array.prototype);
t.equal(getDunderProto(function () {}), Function.prototype);
t.equal(getDunderProto(/./g), RegExp.prototype);
t.equal(getDunderProto(42), Number.prototype);
t.equal(getDunderProto(true), Boolean.prototype);
t.equal(getDunderProto('foo'), String.prototype);
t.end();
});
test('no dunder proto', { skip: !!getDunderProto }, function (t) {
t.notOk('__proto__' in Object.prototype, 'no __proto__ in Object.prototype');
t.end();
});
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'use strict';
require('./get');
require('./set');
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'use strict';
var test = require('tape');
var setDunderProto = require('../set');
test('setDunderProto', { skip: !setDunderProto }, function (t) {
if (!setDunderProto) {
throw 'should never happen; this is just for type narrowing'; // eslint-disable-line no-throw-literal
}
// @ts-expect-error
t['throws'](function () { setDunderProto(); }, TypeError, 'throws if no arguments');
// @ts-expect-error
t['throws'](function () { setDunderProto(undefined); }, TypeError, 'throws with undefined and nothing');
// @ts-expect-error
t['throws'](function () { setDunderProto(undefined, undefined); }, TypeError, 'throws with undefined and undefined');
// @ts-expect-error
t['throws'](function () { setDunderProto(null); }, TypeError, 'throws with null and undefined');
// @ts-expect-error
t['throws'](function () { setDunderProto(null, undefined); }, TypeError, 'throws with null and undefined');
/** @type {{ inherited?: boolean }} */
var obj = {};
t.ok('toString' in obj, 'object initially has toString');
setDunderProto(obj, null);
t.notOk('toString' in obj, 'object no longer has toString');
t.notOk('inherited' in obj, 'object lacks inherited property');
setDunderProto(obj, { inherited: true });
t.equal(obj.inherited, true, 'object has inherited property');
t.end();
});
test('no dunder proto', { skip: !!setDunderProto }, function (t) {
if ('__proto__' in Object.prototype) {
t['throws'](
// @ts-expect-error
function () { ({}).__proto__ = null; }, // eslint-disable-line no-proto
Error,
'throws when setting Object.prototype.__proto__'
);
} else {
t.notOk('__proto__' in Object.prototype, 'no __proto__ in Object.prototype');
}
t.end();
});
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{
"extends": "@ljharb/tsconfig",
"compilerOptions": {
"target": "ES2021",
},
"exclude": [
"coverage",
],
}
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