Package Exports

@a11d/bidirectional-map
@a11d/bidirectional-map/dist/index.js

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Readme

`@a11d/bidirectional-map`

A Map implementation that maintains a bidirectional relationship between keys and values, allowing lookups in both directions.

import '@a11d/bidirectional-map'

const map = new BidirectionalMap([
    ['en', 'English'],
    ['fr', 'French'],
])

map.get('en') // 'English'
map.getKey('English') // 'en'

Installation

npm install @a11d/bidirectional-map

API

Implements the standard Map<K, V> interface with additional methods:

getKey(value: V): K | undefined — Get key by value (reverse lookup)

const map = new BidirectionalMap([['en', 'English'], ['fr', 'French']])
map.getKey('English') // 'en'
map.getKey('Spanish') // undefined

hasValue(value: V): boolean — Check if a value exists

const map = new BidirectionalMap([['en', 'English']])
map.hasValue('English') // true
map.hasValue('French') // false

deleteValue(value: V): boolean — Remove entry by value

const map = new BidirectionalMap([['en', 'English']])
map.deleteValue('English') // true
map.has('en') // false

Global Type

The package automatically registers itself globally, so TypeScript recognizes BidirectionalMap without explicit imports:

// Type is available globally
const map: BidirectionalMap<string, number> = new BidirectionalMap()