bd028579
 易尊强
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let wmUniqueIndex = Math.round(Math.random() * 9);
const supportDefineProperty = typeof Object.defineProperty === 'function';
export default class WeakMap<K extends object, V> {
protected _id: string;
constructor() {
this._id = '__ec_inner_' + wmUniqueIndex++;
}
get(key: K): V {
return (this._guard(key) as any)[this._id];
}
set(key: K, value: V): WeakMap<K, V> {
const target = this._guard(key) as any;
if (supportDefineProperty) {
Object.defineProperty(target, this._id, {
value: value,
enumerable: false,
configurable: true
});
}
else {
target[this._id] = value;
}
return this;
}
delete(key: K): boolean {
if (this.has(key)) {
delete (this._guard(key) as any)[this._id];
return true;
}
return false;
}
has(key: K): boolean {
return !!(this._guard(key) as any)[this._id];
}
protected _guard(key: K): K {
if (key !== Object(key)) {
throw TypeError('Value of WeakMap is not a non-null object.');
}
return key;
}
}
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