README.md

babel-plugin-transform-negative-indices

• NAME
• INSTALLATION
• SYNOPSIS
• DESCRIPTION
• USAGE
  • .babelrc
  • CLI
  • API
• DEVELOPMENT
  • NPM Scripts
• COMPATIBILITY
• SEE ALSO
  • Babel Plugins
  • Other
• VERSION
• AUTHOR
• COPYRIGHT AND LICENSE

NAME

babel-plugin-transform-negative-indices - turn negative array indices into offsets from the end of the array

INSTALLATION

$ npm install babel-plugin-transform-negative-indices

SYNOPSIS

$ cat test.js

const array = [1, 2, 3]
const foo = array[-1]

array[-2] = 42

$ babel --plugins transform-negative-indices test.js

const array = [1, 2, 3]
const foo = array[array.length - 1]

array[array.length - 2] = 42

DESCRIPTION

This is a Babel plugin which transforms negative array indices into offsets from the end of the array, e.g. array[-1] becomes array[array.length - 1].

USAGE

.babelrc

$ cat .babelrc

{
    "plugins": ["transform-negative-indices"]
}

CLI

$ babel --plugins transform-negative-indices script.js

API

require('@babel/core').transform(code, {
    plugins: ['transform-negative-indices']
})

DEVELOPMENT

NPM Scripts

The following NPM scripts are available:

• build - compile the plugin and save it to the target directory
• clean - remove the target directory and its contents
• doctoc - generate the TOC (table of contents) in the README
• rebuild - clean the target directory and recompile the plugin
• test - recompile and run the test suite
• test:unit - run the test suite

COMPATIBILITY

• Babel 6+ (only Babel 7+ is tested/supported)
• Maintained node versions

SEE ALSO

Babel Plugins

• babel-plugin-negative-array-indices - doesn't install / unmaintained
• babel-plugin-array-last-index

Other

• negative-array - ES6 Proxy wrapper

VERSION

1.0.3

AUTHOR

• Dan Rouse
• chocolateboy - maintainer

COPYRIGHT AND LICENSE

Copyright © 2016-2020 by Dan Rouse.

This is free software; you can redistribute it and/or modify it under the terms of the MIT License.