Function stringifyKey

packages/mobx/src/utils/utils.ts:194–202

(key: any)

        : /* istanbul ignore next */ Object.getOwnPropertyNames

export function stringifyKey(key: any): string {
    if (typeof key === "string") {
        return key
    }
    if (typeof key === "symbol") {
        return key.toString()
    }
    return new String(key).toString()
}

export function toPrimitive(value: any) {
    return value === null ? null : typeof value === "object" ? "" + value : value