benchmark.js

/*
 * Copyright (C) 2025 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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const EXPECTED_LOG_LENGTH = 6824;

class Benchmark extends StartupBenchmark {
  lastResult;

  constructor({iterationCount}) {
    super({
      iterationCount,
      expectedCacheCommentCount: 464,
      sourceCodeReuseCount: 8,
    });
  }

  runIteration(iteration) {
    // Module is loaded into MobXBenchmark
    let MobXBenchmark;
    // super.prepareForNextIteration() sets this up for us.
    eval(this.currentIterationSourceCode);
    this.lastResult = MobXBenchmark.runTest();
  }

  validate() {
    console.assert(
      this.lastResult.length === EXPECTED_LOG_LENGTH,
      `Expected this.lastResult.length to be ${EXPECTED_LOG_LENGTH}, but got ${this.lastResult.length}`
    );
  }
}