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js-utils/README.md

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# JS Utils
This project is a collection of utilities, collected from my other Typescript projects, lightly documented and heavily
tested.
## Contents
- [JS Utils](#js-utils)
- [Contents](#contents)
- [Status](#status)
- [Releases](#releases)
- [Usage](#usage)
- [Features](#features)
## Status
[![Pipeline status](https://img.shields.io/gitlab/pipeline/ssube/js-utils/master.svg?gitlab_url=https%3A%2F%2Fgit.apextoaster.com&logo=gitlab)](https://git.apextoaster.com/ssube/js-utils/commits/master)
[![Lines of Code](https://sonarcloud.io/api/project_badges/measure?project=ssube_js-utils&metric=ncloc)](https://sonarcloud.io/dashboard?id=ssube_js-utils)
[![Test coverage](https://codecov.io/gh/ssube/js-utils/branch/master/graph/badge.svg)](https://codecov.io/gh/ssube/js-utils)
[![MIT license](https://img.shields.io/github/license/ssube/js-utils.svg)](https://github.com/ssube/js-utils/blob/master/LICENSE.md)
[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fssube%2Fjs-utils.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2Fssube%2Fjs-utils?ref=badge_shield)
[![Open bug count](https://img.shields.io/github/issues-raw/ssube/js-utils/type-bug.svg)](https://github.com/ssube/js-utils/issues?q=is%3Aopen+is%3Aissue+label%3Atype%2Fbug)
[![Open issue count](https://img.shields.io/github/issues-raw/ssube/js-utils.svg)](https://github.com/ssube/js-utils/issues?q=is%3Aopen+is%3Aissue)
[![Closed issue count](https://img.shields.io/github/issues-closed-raw/ssube/js-utils.svg)](https://github.com/ssube/js-utils/issues?q=is%3Aissue+is%3Aclosed)
[![Renovate badge](https://img.shields.io/badge/renovate-enabled-brightgreen.svg)](https://renovatebot.com)
[![Dependency status](https://img.shields.io/david/ssube/js-utils.svg)](https://david-dm.org/ssube/js-utils)
[![Dev dependency status](https://img.shields.io/david/dev/ssube/js-utils.svg)](https://david-dm.org/ssube/js-utils?type=dev)
[![Known vulnerabilities](https://snyk.io/test/github/ssube/js-utils/badge.svg)](https://snyk.io/test/github/ssube/js-utils)
[![Maintainability score](https://api.codeclimate.com/v1/badges/2cb00161d1eaa63cf7c6/maintainability)](https://codeclimate.com/github/ssube/js-utils/maintainability)
[![Technical debt ratio](https://img.shields.io/codeclimate/tech-debt/ssube/js-utils.svg)](https://codeclimate.com/github/ssube/js-utils/trends/technical_debt)
[![Quality issues](https://img.shields.io/codeclimate/issues/ssube/js-utils.svg)](https://codeclimate.com/github/ssube/js-utils/issues)
[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/ssube/js-utils.svg?logo=lgtm)](https://lgtm.com/projects/g/ssube/js-utils/context:javascript)
[![Total alerts](https://img.shields.io/lgtm/alerts/g/ssube/js-utils.svg)](https://lgtm.com/projects/g/ssube/js-utils/alerts/)
## Releases
[![github release link](https://img.shields.io/badge/github-release-blue?logo=github)](https://github.com/ssube/js-utils/releases)
[![github release version](https://img.shields.io/github/tag/ssube/js-utils.svg)](https://github.com/ssube/js-utils/releases)
[![github commits since release](https://img.shields.io/github/commits-since/ssube/js-utils/v0.1.6.svg)](https://github.com/ssube/js-utils/compare/v0.1.6...master)
[![npm package link](https://img.shields.io/badge/npm-package-blue?logo=npm)](https://www.npmjs.com/package/@apextoaster/js-utils)
[![npm release version](https://img.shields.io/npm/v/@apextoaster/js-utils.svg)](https://www.npmjs.com/package/@apextoaster/js-utils)
[![Typescript definitions](https://img.shields.io/npm/types/@apextoaster/js-utils.svg)](https://www.npmjs.com/package/@apextoaster/js-utils)
## Usage
Install:
```shell
yarn add -D @apextoaster/js-utils
```
And import:
```typescript
import { mustExist } from '@apextoaster/js-utils';
```
The library is bundled and has no dependencies.
## Features
[Please see the complete API docs](https://github.com/ssube/js-utils/blob/master/docs/api/js-utils.md) for the full
function list.
Features utilities and helpers for:
- Array
- assertions/guards:
- `hasItems`
- `isArray` for both `Array`/`ReadonlyArray`
- `isEmpty`
- `lengthOf`
- conversion
- `filterZip`
- `toArray`
- Array Mapper
- array-to-map converter, reduces an array of values to a map, using an array of keys
- Async
- timed promises
- `defer`/`deferValue`
- `deferUntil`
- `timeout`
- Buffer
- concatenation
- `concat`
- `encode`
- Checklist
- allow/deny list
- Child Process
- `childResult`
- `writeInput`
- Env Vars
- `isDebug`
- Errors
- nestable, typed error
- `ChildProcessError`
- `InvalidArgumentError`
- `MissingKeyError`
- `NotFoundError`
- `NotImplementedError`
- `TimeoutError`
- Logger
- test logging helpers
- Map
- types
- `MapLike`
- assertions/guards:
- `mustGet`
- null-safe helpers
- `getOrDefault`
- helpers for `Map<K, Array<V>>`
- `getHead`/`getHeadOrDefault`
- `setOrPush`
- concat/merge
- `mergeMap`
- `pushMergeMap`
- conversion
- `entriesOf`
- `makeDict`
- `makeMap`
- `pairsToMap`
- Math
- predicates for functional methods
- `sum`
- Maybe
- types
- `Maybe`
- `None`
- assertions/guards
- `doesExist`
- `mustExist`
- `mustDefault`
- `mustFind`
- `removeNone`
- null-safe helpers
- `isNone`
- `isSome`
- Predicate
- types for functional methods
- Reflect
- `getConstructor`
- `getMethods`
- Signal
- wait for OS signal
- `signal`
- String
- `leftPad`
- `trim` with suffix