Method keys

packages/socket.io/test/support/expectjs.d.ts:146–146

* Assert exact keys or inclusion of keys by using the `.own` modifier.

(keys: string[])

     * Assert exact keys or inclusion of keys by using the `.own` modifier.
     */
    keys(keys: string[]): Assertion;
    /**
     * Assert exact keys or inclusion of keys by using the `.own` modifier.
     */