is-regex

node's assert.deepEqual algorithm

Escape RegExp special characters

Returns `true` if the given string looks like a glob pattern or an extglob pattern. This makes it easy to create code that only uses external modules like node-glob when necessary, resulting in much faster code execution and initialization time, and a bet

Matches strings against configurable strings, globs, regular expressions, and/or functions

Returns true if a string has an extglob.

Tokenizes a string that represents a regular expression.

ES6 spec-compliant RegExp.prototype.flags shim.

Compile regular expressions using named groups to ES5.

Regular expression for matching a shebang line

Express style path to RegExp utility

detect possibly catastrophic, exponential-time regular expressions

Is this value a JS SharedArrayBuffer?

Match balanced character pairs, like "{" and "}"

The semantic version parser used by npm.

Store information about any JS value in a side channel. Uses WeakMap if available.

Get an iterator for any JS language value. Works robustly across all environments, all versions.

ES6 spec-compliant RegExp.prototype.flags shim.

Which kind of boxed JS primitive is this?

Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.

Robustly `.call.bind()` a function

Array#isArray for older browsers

ES2015-compliant shim for Object.is - differentiates between -0 and +0

Is this an arguments object? It's a harder question than you think.

Is this value a JS SharedArrayBuffer?

An AST-based pattern checker for JavaScript.