type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

Allows users to use generators in order to write common functions that can be both sync or async.

Fast (and loose) selective `process.env` replacer using js-tokens instead of an AST

Buffers events from a stream until you are ready to handle them.

A small polyfill for Object.setprototypeof

The Node.js `util.deprecate()` function with browser support

Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.

Safer Node.js Buffer API

Merge multiple streams into one stream in sequence or parallel.

ES2015 `Object.assign()` ponyfill

An Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim

Fast deep equal

Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.

Normalize slashes in a file path to be posix/unix-like forward slashes. Also condenses repeat slashes to a single slash and removes and trailing slashes, unless disabled.

extend like a boss

A stream that emits multiple other streams one after another.

process.nextTick but always with args

Create a stream that emits events from multiple other streams

Use node's fs.realpath, but fall back to the JS implementation if the native one fails

[](https://travis-ci.org/stefanpenner/get-caller-file) [](https://ci.a