Method assertNumber

src/utils/log.js:453–459

* Throws an error if the first argument isn't a number. The allowed values * include `0` and `NaN`. * * For more details see `assert`. * * @param {*} shouldBeNumber * @param {!Array|string=} opt_message The assertion message * @return {number} The number value. The allowed value

(shouldBeNumber, opt_message)

   * @closurePrimitive {asserts.matchesReturn}
   */
  assertNumber(shouldBeNumber, opt_message) {
    return assertions.assertNumber(
      this.boundAssertFn_,
      shouldBeNumber,
      opt_message
    );
  }

  /**
   * Throws an error if the first argument is not an array.