Method assert

src/utils/log.js:388–402

* Throws an error if the first argument isn't trueish. * * Supports argument substitution into the message via %s placeholders. * * Throws an error object that has two extra properties: * - associatedElement: This is the first element provided in the var args. * It can be used fo

(shouldBeTrueish, opt_message, var_args)

   * @closurePrimitive {asserts.truthy}
   */
  assert(shouldBeTrueish, opt_message, var_args) {
    if (isArray(opt_message)) {
      return this.assert.apply(
        this,
        [shouldBeTrueish].concat(
          this.expandMessageArgs_(/** @type {!Array} */ (opt_message))
        )
      );
    }

    return assertions.assert.apply(
      null,
      [this.suffix_].concat(Array.prototype.slice.call(arguments))
    );
  }

  /**
   * Throws an error if the first argument isn't an Element