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

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

ES2015 `Object.assign()` ponyfill

YAML 1.2 parser and serializer

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.

Merge multiple streams into one stream in sequence or parallel.

process.nextTick but always with args

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

extend like a boss

Create a stream that emits events from multiple other streams

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

Fast deep equal

A stream that emits multiple other streams one after another.

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

Constant-time comparison of Buffers

return list of CallSite objects from a captured stacktrace

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

Support for representing 64-bit integers in JavaScript

An arbitrary-precision Decimal type for JavaScript.

A cross browser microtask library