// 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. const _keys = Symbol('keys') const _normKey = Symbol('normKey') const normalize = s => s.normalize('NFKD').toLowerCase() const OGMap = Map module.exports = class Map extends OGMap { constructor (items = []) { super() this[_keys] = new OGMap() for (const [key, val] of items) { this.set(key, val) } } [_normKey] (key) { return typeof key === 'string' ? normalize(key) : key } 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)) } }