# is-deep-strict-equal-x > node's isDeepStrictEqual algorithm. Latest version **1.1.2** (published 2019-08-28) · MIT license · 0 weekly downloads ## Install ```sh npm install is-deep-strict-equal-x pnpm add is-deep-strict-equal-x yarn add is-deep-strict-equal-x bun add is-deep-strict-equal-x ``` ## Health **Score 20/100 (F)** — status: abandoned. Positive: esm support; no vulnerabilities. Warnings: low downloads; no types. Negative: abandoned; low maintenance score. ## Facts | | | |---|---| | Version | 1.1.2 | | Published | 2019-08-28 | | First published | 2019-07-19 | | Weekly downloads | 0 | | License | MIT | | TypeScript types | none | | Module format | ESM + CommonJS | | Node | >=8.11.4 | | Dependencies | 34 | | Unpacked size | 1.1 MB | | Known vulnerabilities | 0 | | Install scripts | no | | GitHub stars | 0 | | Author | Graham Fairweather | | Maintainers | xotic750 | | Keywords | es6, isDeepStrictEqual, library, javascript, testing, nodejs, browser, commonjs, test | ## Links - npm: https://www.npmjs.com/package/is-deep-strict-equal-x - Repository: https://github.com/Xotic750/is-deep-strict-equal-x - Issues: https://github.com/Xotic750/is-deep-strict-equal-x/issues - npm.io page: https://npm.io/package/is-deep-strict-equal-x ## Dependencies (34) - [is-map-x](https://npm.io/package/is-map-x.md) ^2.1.2 - [is-nan-x](https://npm.io/package/is-nan-x.md) ^2.1.1 - [is-set-x](https://npm.io/package/is-set-x.md) ^2.1.2 - [attempt-x](https://npm.io/package/attempt-x.md) ^2.1.2 - [is-bigint](https://npm.io/package/is-bigint.md) ^1.0.0 - [is-buffer](https://npm.io/package/is-buffer.md) ^2.0.3 - [is-string](https://npm.io/package/is-string.md) ^1.0.4 - [is-symbol](https://npm.io/package/is-symbol.md) ^1.0.2 - [is-array-x](https://npm.io/package/is-array-x.md) ^2.1.2 - [is-error-x](https://npm.io/package/is-error-x.md) ^2.1.2 - [is-index-x](https://npm.io/package/is-index-x.md) ^2.1.2 - [is-regexp-x](https://npm.io/package/is-regexp-x.md) ^3.1.2 - [same-value-x](https://npm.io/package/same-value-x.md) ^2.1.1 - [to-boolean-x](https://npm.io/package/to-boolean-x.md) ^2.1.1 - [collections-x](https://npm.io/package/collections-x.md) ^3.1.2 - [object-keys-x](https://npm.io/package/object-keys-x.md) ^3.1.2 - [array-filter-x](https://npm.io/package/array-filter-x.md) ^3.1.2 - [is-data-view-x](https://npm.io/package/is-data-view-x.md) ^2.1.2 - [is-date-object](https://npm.io/package/is-date-object.md) ^1.0.1 - [to-string-tag-x](https://npm.io/package/to-string-tag-x.md) ^2.1.2 - [is-number-object](https://npm.io/package/is-number-object.md) ^1.0.3 - [arraybuffer-equal](https://npm.io/package/arraybuffer-equal.md) ^1.0.4 - [is-array-buffer-x](https://npm.io/package/is-array-buffer-x.md) ^2.1.2 - [is-boolean-object](https://npm.io/package/is-boolean-object.md) ^1.0.0 - [which-typed-array](https://npm.io/package/which-typed-array.md) ^1.1.0 - [get-prototype-of-x](https://npm.io/package/get-prototype-of-x.md) ^2.1.2 - [has-own-property-x](https://npm.io/package/has-own-property-x.md) ^4.1.2 - [is-boxed-primitive](https://npm.io/package/is-boxed-primitive.md) ^1.0.0 - [simple-methodize-x](https://npm.io/package/simple-methodize-x.md) ^1.0.4 - [has-symbol-support-x](https://npm.io/package/has-symbol-support-x.md) ^2.1.2 - [get-own-property-names-x](https://npm.io/package/get-own-property-names-x.md) ^3.1.2 - [property-is-enumerable-x](https://npm.io/package/property-is-enumerable-x.md) ^2.1.2 - [get-own-property-symbols-x](https://npm.io/package/get-own-property-symbols-x.md) ^2.1.2 - [to-string-symbols-supported-x](https://npm.io/package/to-string-symbols-supported-x.md) ^2.1.2 ## Alternatives - [duck](https://npm.io/package/duck.md) — 4.2M weekly downloads - [ava](https://npm.io/package/ava.md) — 560.2K weekly downloads - [storybook-addon-module-mock](https://npm.io/package/storybook-addon-module-mock.md) — 71.7K weekly downloads - [vest](https://npm.io/package/vest.md) — 50.1K weekly downloads - [@ethereum-waffle/mock-contract](https://npm.io/package/@ethereum-waffle/mock-contract.md) — 40.0K weekly downloads ## Recent versions - 1.1.2 (latest) — 2019-08-28 - 1.1.1 — 2019-08-20 - 1.1.0 — 2019-08-14 - 1.0.15 — 2019-08-05 - 1.0.14 — 2019-08-05 - 1.0.13 — 2019-08-05 - 1.0.12 — 2019-07-31 - 1.0.11 — 2019-07-27 - 1.0.10 — 2019-07-26 - 1.0.9 — 2019-07-25 - 1.0.8 — 2019-07-24 - 1.0.7 — 2019-07-24 - 1.0.6 — 2019-07-22 - 1.0.5 — 2019-07-21 - 1.0.4 — 2019-07-21 - … 4 more at https://npm.io/package/is-deep-strict-equal-x/versions ## README Travis status Dependency status devDependency status npm version jsDelivr hits bettercodehub score Coverage Status ## is-deep-strict-equal-x node's isDeepStrictEqual algorithm. - [is-deep-strictequal-x](#module_is-deep-strictequal-x) - [`.isDeepStrictEqual`](#module_is-deep-strictequal-x.isDeepStrictEqual) ⇒ boolean - [`.isDeepEqual`](#module_is-deep-strictequal-x.isDeepEqual) ⇒ boolean ### `is-deep-strict-equal-x.isDeepStrictEqual` ⇒ boolean Tests for deep equality between the actual and expected parameters. "Deep" equality means that the enumerable "own" properties of child objects are recursively evaluated also by the following rules. #Comparison details Primitive values are compared using the SameValue Comparison, used by Object.is(). Type tags of objects should be the same. [[Prototype]] of objects are compared using the Strict Equality Comparison. Only enumerable "own" properties are considered. Error names and messages are always compared, even if these are not enumerable properties. Enumerable own Symbol properties are compared as well. Object wrappers are compared both as objects and unwrapped values. Object properties are compared unordered. Map keys and Set items are compared unordered. Recursion stops when both sides differ or both sides encounter a circular reference. WeakMap and WeakSet comparison does not rely on their values. See below for further details. **Kind**: Exported function **Returns**: boolean - `true` if `val1` and `val2` are deemed equal, otherwise `false`. **See**: https://nodejs.org/dist/latest-v10.x/docs/api/util.html#util_util_isdeepstrictequal_val1_val2 | Param | Type | Description | | ----- | --------------- | ------------------------- | | val1 | \* | First comparison object. | | val2 | \* | Second comparison object. | **Example** ```js import {isDeepStrictEqual} from 'is-deep-strict-equal-x'; // This fails because 1 !== '1'. isDeepStrictEqual({a: 1}, {a: '1'}); // false // The following objects don't have own properties const date = new Date(); const object = {}; const fakeDate = {}; isDeepStrictEqual(fakeDate, Date.prototype); // Different [[Prototype]]: isDeepStrictEqual(object, fakeDate); // false // Different type tags: isDeepStrictEqual(date, fakeDate); // false isDeepStrictEqual(NaN, NaN); // true // Different unwrapped numbers: isDeepStrictEqual(Object(1), Object(2)); // false isDeepStrictEqual(Object('foo'), Object('foo')); // true isDeepStrictEqual(-0, -0); // true // Different zeros using the SameValue Comparison: isDeepStrictEqual(0, -0); // false const symbol1 = Symbol(); const symbol2 = Symbol(); isDeepStrictEqual({[symbol1]: 1}, {[symbol1]: 1}); // true isDeepStrictEqual({[symbol1]: 1}, {[symbol2]: 1}); // false const weakMap1 = new WeakMap(); const weakMap2 = new WeakMap([[{}, {}]]); const weakMap3 = new WeakMap(); weakMap3.unequal = true; isDeepStrictEqual(weakMap1, weakMap2); // true // Fails because weakMap3 has a property that weakMap1 does not contain: isDeepStrictEqual(weakMap1, weakMap3); // false ``` ### `is-deep-strict-equal-x.isDeepEqual` ⇒ boolean #Deprecated - Use isDeepStrictEqual instead! **Kind**: Exported function **Returns**: boolean - `true` if `val1` and `val2` are deemed equal, otherwise `false`. | Param | Type | Description | | ----- | --------------- | ------------------------- | | val1 | \* | First comparison object. | | val2 | \* | Second comparison object. | **Example** ```js import {isDeepEqual} from 'is-deep-strict-equal-x'; isDeepEqual(Error('a'), Error('b')); // true isDeepEqual(4, '4'); // => true isDeepEqual({a: 4, b: '1'}, {b: '1', a: 4}); // => true isDeepEqual(new Date(), new Date(2000, 3, 14)); // => false isDeepEqual(4, '4', true); // => false ``` --- _Source: https://npm.io/package/is-deep-strict-equal-x · Machine-readable twin of the npm.io package page. 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