Function assertReadableStream

out/cli.cjs:10753–10757

(x5, context)

        return x5;
      }
      function assertReadableStream(x5, context) {
        if (!IsReadableStream(x5)) {
          throw new TypeError(`${context} is not a ReadableStream.`);
        }
      }
      function AcquireReadableStreamDefaultReader(stream4) {
        return new ReadableStreamDefaultReader2(stream4);
      }