ECMAScript spec abstract operations.
JavaScript
123
30
MIT License
es-abstract is a JavaScript library that provides implementations of ECMAScript specification abstract operations. It allows developers to access these operations by edition/year and by name, enabling precise control over JavaScript engine behavior. This library is primarily intended for library authors and developers who need to ensure their code adheres to specific ECMAScript specifications or require fine-grained control over JavaScript operations.
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Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.
ES spec-compliant shim for ArrayBuffer.prototype.slice
Returns an array of Typed Array names that are available in the current environment
Robustly `.call.bind()` a function
Robust call-bound JavaScript intrinsics, using `call-bind` and `get-intrinsic`.
Get the ArrayBuffer out of a DataView, robustly.
Get the byteLength out of a DataView, robustly.
Get the byteOffset out of a DataView, robustly.
`Object.defineProperty`, but not IE 8's broken one.
A simple cache for a few of the JS Error constructors.
ES Object-related atoms: Object, ToObject, RequireObjectCoercible
A helper to optimistically set Symbol.toStringTag, when possible.
ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.
An ES2015 spec-compliant `Function.prototype.name` shim
Get and robustly cache all JS language-level intrinsics at first require time
Robustly get the [[Prototype]] of an object
Gets the description of a Symbol. Handles `Symbol()` vs `Symbol('')` properly when possible.
ECMAScript spec-compliant polyfill/shim for `globalThis`
`Object.getOwnPropertyDescriptor`, but accounts for IE's broken implementation.
Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.
Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?
Determine if the JS environment has Symbol support. Supports spec, or shams.
A robust, ES3 compatible, "has own property" predicate.
ES spec-like internal slots
Is this value a JS ArrayBuffer?
Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.
Is this value a JS DataView? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.
Is this value negative zero? === will lie to you
Is this value a JS regex? Works cross-realm/iframe, and despite ES6 @@toStringTag
Is this value a JS Set? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value a JS SharedArrayBuffer?
Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.
Is this value a JS WeakRef? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
ES Math-related intrinsics and helpers, robustly cached.
string representations of objects in node and the browser
An Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim
ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim
Robustly get an object's own property keys (strings and symbols), including non-enumerables when possible
ES6 spec-compliant RegExp.prototype.flags shim.
`Array.prototype.concat`, but made safe by ignoring Symbol.isConcatSpreadable
Push an array of items into an array, while being robust against prototype modification
Give a regex, get a robust predicate function that tests it against a string.
Robustly set the [[Prototype]] of an object
Firefox 17-26 iterators throw a StopIteration object to indicate "done". This normalizes it.
ES5 spec-compliant shim for String.prototype.trim
ES2019 spec-compliant String.prototype.trimEnd shim.
ES2019 spec-compliant String.prototype.trimStart shim.
Get the ArrayBuffer out of a TypedArray, robustly.
Robustly get the byte length of a Typed Array
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