ECMAScript spec abstract operations.
Like a Set, but provides the index of the `key` in the backing array
Esprima-compatible implementation of the Mozilla JS Parser API
Power Assert feature instrumentor on the fly
Power Assert instrumentor from source to source, with source-map
ES2015-compliant shim for Object.is - differentiates between -0 and +0
Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?
Is this value a JS WeakSet? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Convert assert to power-assert on ESTree AST
Is this value a JS Set? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Robustly get an object's own property keys (strings and symbols), including non-enumerables when possible
Get and robustly cache all JS language-level intrinsics at first require time
Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Shorthands for commonly used doctypes
Helper function for exhaustive checks of discriminated unions in TypeScript
ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.
calculates width of given string
Stringify an object so it can be safely inlined in JavaScript code
A querystring parser that supports nesting and arrays, with a depth limit
parse SPDX license expressions
Does this JS environment support the `name` property on functions?
If available, the `Object.prototype.__proto__` accessor and mutator, call-bound
Store information about any JS value in a side channel. Uses WeakMap if available.
validate SPDX license expressions