Function IsWritableStream

out/cli.cjs:12237–12245

(x5)

        stream4._backpressure = false;
      }
      function IsWritableStream(x5) {
        if (!typeIsObject(x5)) {
          return false;
        }
        if (!Object.prototype.hasOwnProperty.call(x5, "_writableStreamController")) {
          return false;
        }
        return x5 instanceof WritableStream2;
      }
      function IsWritableStreamLocked(stream4) {
        if (stream4._writer === void 0) {
          return false;