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6000 packages found
Robustly `.call.bind()` a function
BDD/TDD assertion library for node.js and the browser. Test framework agnostic.
Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?
Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.
Get and robustly cache all JS language-level intrinsics at first require time
Define a data property on an object. Will fall back to assignment in an engine without descriptors.
the complete solution for node.js command-line programs
Determine if the JS environment has `Symbol.toStringTag` support. Supports spec, or shams.
Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
- array
- TypedArray
- typed array
- which
- typed
- Int8Array
- Uint8Array
- Uint8ClampedArray
- Int16Array
- Uint16Array
- Int32Array
- Uint32Array
- Float32Array
- Float64Array
- View more
Is this value negative zero? === will lie to you
`Object.defineProperty`, but not IE 8's broken one.
Returns an array of Typed Array names that are available in the current environment
- typed
- arrays
- Float32Array
- Float64Array
- Int8Array
- Int16Array
- Int32Array
- Uint8Array
- Uint8ClampedArray
- Uint16Array
- Uint32Array
- BigInt64Array
- BigUint64Array
Reactive Extensions for modern JavaScript
A simple cache for a few of the JS Error constructors.
ES6 spec-compliant RegExp.prototype.flags shim.
TypeScript-first schema declaration and validation library with static type inference
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.
- array
- TypedArray
- typed array
- is
- typed
- Int8Array
- Uint8Array
- Uint8ClampedArray
- Int16Array
- Uint16Array
- Int32Array
- Uint32Array
- Float32Array
- Float64Array
- View more
Gets the description of a Symbol. Handles `Symbol()` vs `Symbol('')` properly when possible.
ES spec-like internal slots
ES2019 spec-compliant String.prototype.trimStart shim.