name : case-insensitive-map.js // package children are represented with a Map object, but many file systems // are case-insensitive and unicode-normalizing, so we need to treat // node.children.get('FOO') and node.children.get('foo') as the same thing. module.exports = class CIMap extends Map { #keys = new Map() constructor (items = []) { super() for (const [key, val] of items) { this.set(key, val) } } #normKey (key) { if (typeof key !== 'string') { return key } return key.normalize('NFKD').toLowerCase() } get (key) { const normKey = this.#normKey(key) return this.#keys.has(normKey) ? super.get(this.#keys.get(normKey)) : undefined } set (key, val) { const normKey = this.#normKey(key) if (this.#keys.has(normKey)) { super.delete(this.#keys.get(normKey)) } this.#keys.set(normKey, key) return super.set(key, val) } delete (key) { const normKey = this.#normKey(key) if (this.#keys.has(normKey)) { const prevKey = this.#keys.get(normKey) this.#keys.delete(normKey) return super.delete(prevKey) } } has (key) { const normKey = this.#normKey(key) return this.#keys.has(normKey) && super.has(this.#keys.get(normKey)) } }