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es-shims

133 indexed repositories · View on GitHub

es5-shim
ECMAScript 5 compatibility shims for legacy (and modern) JavaScript engines

JavaScript · 7074 stars
globalThis
ECMAScript spec-compliant polyfill/shim for `globalThis`.

JavaScript · 157 stars
Promise.prototype.finally
ES Proposal spec-compliant shim for Promise.prototype.finally

JavaScript · 140 stars
es-shim-api
API contract, and rudimentary tests, for modules that conform to the *es-shim API*

JavaScript · 83 stars
Object.values
ES2017 spec-compliant shim for Object.values

JavaScript · 72 stars
Object.entries
ES2017 spec-compliant shim for Object.entries

JavaScript · 59 stars
array-includes
Array.prototype.includes spec-compliant polyfill

JavaScript · 43 stars
DisposableStack
An ESnext spec-compliant `DisposableStack`, `AsyncDisposableStack`, `Symbol.dispose`, and `Symbol.asyncDispose` shim/polyfill/replacement...

JavaScript · 38 stars
String.prototype.replaceAll
Spec-compliant polyfill for String.prototype.replaceAll ESnext proposal.

JavaScript · 36 stars
Array.prototype.flatMap
An ESnext spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.

JavaScript · 33 stars
Object.fromEntries
Official ES spec-compliant polyfill for Object.fromEntries

JavaScript · 32 stars
Array.prototype.flat
An ESnext spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.

JavaScript · 31 stars
Array.prototype.at
An ES-spec-compliant (proposed) `Array.prototype.at`shim/polyfill/replacement that works as far down as ES3.

JavaScript · 30 stars
object-is
ES6-compliant shim for Object.is - differentiates between -0 and +0, and can compare to NaN.

JavaScript · 24 stars
String.prototype.padStart
ES spec-compliant shim for String.prototype.padStart

JavaScript · 23 stars
get-own-property-symbols
ES6 Object.getOwnPropertySymbols partial polyfill

JavaScript · 23 stars
iterator-helpers
An ESnext spec-compliant iterator helpers shim/polyfill/replacement that works as far down as ES3.

JavaScript · 22 stars
Object.getOwnPropertyDescriptors
Spec-compliant shim for `Object.getOwnPropertyDescriptors` that works in ES5.

JavaScript · 20 stars
error-cause
An ES-spec-compliant shim/polyfill/replacement for the `.cause` property on all Error types that works as far down as ES3

JavaScript · 19 stars
Object.hasOwn
Official ES spec-compliant polyfill for Object.hasOwn

JavaScript · 17 stars
113 more repositories live on View on GitHub

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es-shims/Promise.allSettledKeyed#1 · Opened Jul 6, 2026
Dependency Dashboard Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

es-shims/Promise.allKeyed#1 · Opened Jul 6, 2026
A dependency doesn't work in the browser Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

es-shims/es-arraybuffer-base64#3 · 9 comments · Opened Apr 4, 2026
What's the point? Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

es-shims/Array.prototype.join#2 · Opened Feb 1, 2026
Error building with Plasmo Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

es-shims/math-intrinsics#3 · 5 comments · Opened Jan 24, 2026
Dependency Dashboard Open

Difficulty 2/5 1-3 hours Newbie friendliness 20/100

es-shims/WeakMap.prototype.getOrInsertComputed#1 · Opened Apr 24, 2025
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

es-shims/WeakMap.prototype.getOrInsert#1 · Opened Apr 24, 2025
Dependency Dashboard Open

Difficulty 1/5 Under an hour Newbie friendliness 25/100

es-shims/Map.prototype.getOrInsertComputed#1 · Opened Apr 22, 2025
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 20/100

es-shims/Map.prototype.getOrInsert#1 · Opened Apr 22, 2025
Object.defineProperty bug Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

es-shims/es5-shim#485 · 1 comment · Opened Apr 11, 2025
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

es-shims/TypedArray.prototype.at#1 · Opened Mar 5, 2025
Dependency Dashboard Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

es-shims/Date.prototype.getYear#1 · Opened Mar 4, 2025
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 15/100

es-shims/Array.isArray#1 · Opened Mar 4, 2025
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

es-shims/Array.prototype.reverse#1 · Opened Mar 4, 2025
Build error with Parcel Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

es-shims/math-intrinsics#2 · 1 comment · 2 reactions · Opened Dec 12, 2024
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

es-shims/math-intrinsics#1 · Opened Dec 11, 2024
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

es-shims/dunder-proto#1 · Opened Dec 4, 2024
`isError` returns `false` for `DOMException` instances Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

es-shims/Error.isError#2 · 5 comments · Opened Nov 12, 2024
Dependency Dashboard Open

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es-shims/Error.isError#1 · Opened Oct 15, 2024
72 unit tests now fail when running tests-only in Node 20-22 Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

es-shims/Date#3 · 4 comments · Opened Sep 15, 2024
Assertion failed: `SortCompare` must be an abstract closure taking 2 arguments Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

es-shims/Array.prototype.toSorted#4 · 10 comments · Opened Jun 9, 2024
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

es-shims/Math.sumPrecise#1 · Opened Apr 9, 2024
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 20/100

es-shims/es-object-atoms#1 · Opened Mar 17, 2024
Rename to `array.fromasync` and update to the es-shims interface Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

es-shims/array-from-async#1 · 1 comment · Opened Oct 9, 2023
Cannot find module 'es-abstract/2023/CreateDataProperty' Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

es-shims/Object.getOwnPropertyDescriptors#50 · 1 comment · Opened Sep 8, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/TypedArray.prototype.slice#1 · Opened Jul 11, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/Promise.withResolvers#1 · Opened Jul 11, 2023
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 20/100

es-shims/ArrayBuffer.prototype.slice#1 · Opened Jul 9, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/es-arraybuffer-base64#1 · Opened May 20, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

es-shims/Object.groupBy#1 · Opened May 18, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

es-shims/Map.groupBy#1 · Opened May 18, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/es-constants#1 · Opened May 18, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 18/100

es-shims/Math.f16round#1 · Opened May 16, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 12/100

es-shims/ArrayBuffer.prototype.transferToFixedLength#1 · Opened Feb 1, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/ArrayBuffer.prototype.transfer#1 · Opened Feb 1, 2023
Dependency Dashboard Open

Difficulty 1/5 Under an hour Newbie friendliness 15/100

es-shims/ArrayBuffer.prototype.detached#1 · Opened Jan 18, 2023
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/es-set-tostringtag#1 · Opened Dec 21, 2022
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 15/100

es-shims/SuppressedError#1 · Opened Dec 20, 2022
Dependency Dashboard Open

Difficulty 2/5 1-3 hours Newbie friendliness 15/100

es-shims/DisposableStack#1 · Opened Dec 20, 2022
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

es-shims/Iterator.prototype#1 · Opened Dec 6, 2022
Dependency Dashboard Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

es-shims/Set.prototype.isDisjointFrom#1 · Opened Dec 5, 2022
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/Set.prototype.isSupersetOf#1 · Opened Dec 5, 2022
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/Set.prototype.isSubsetOf#1 · Opened Dec 5, 2022
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

es-shims/Set.prototype.symmetricDifference#1 · Opened Dec 5, 2022
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 20/100

es-shims/Set.prototype.difference#1 · Opened Dec 3, 2022
Dependency Dashboard Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

es-shims/Set.prototype.intersection#1 · Opened Dec 3, 2022
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

es-shims/iterator-helpers#1 · Opened Dec 1, 2022
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/Set.prototype.union#1 · Opened Nov 30, 2022
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

es-shims/String.prototype.toWellFormed#1 · Opened Sep 13, 2022
Dependency Dashboard Open

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es-shims/String.prototype.isWellFormed#1 · Opened Sep 13, 2022

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