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

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

$ 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

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].

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

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

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

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

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

• negative-array - ES6 Proxy wrapper

1.0.3

• Dan Rouse
• chocolateboy - maintainer

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.