main() — react Function Reference

Source Code

compiler/scripts/enable-feature-flag.js lines 267–344

async function main() {
  const flagName = parseArgs();

  console.log(`\nEnabling flag: '${flagName}'`);

  try {
    // Step 1: Enable flag in Environment.ts
    enableFlagInEnvironment(flagName);

    // Step 2: Run tests to find failures
    const {output} = runTests();
    const failingTests = parseFailingTests(output);

    console.log(`\nFound ${failingTests.length} failing tests`);

    if (failingTests.length === 0) {
      console.log('No failing tests! Feature flag enabled successfully.');
      process.exit(0);
    }

    // Step 3: Add pragma to each failing fixture
    console.log(`\nAdding '@${flagName}:false' pragma to failing fixtures...`);

    const notFound = [];
    let notFoundCount = 0;

    for (const testName of failingTests) {
      const fixturePath = findFixtureFile(testName);

      if (!fixturePath) {
        console.warn(`Could not find fixture file for: ${testName}`);
        notFound.push(fixturePath);
        continue;
      }

      const updated = addPragmaToFixture(fixturePath, flagName);
      if (updated) {
        updatedCount++;
        console.log(`  Updated: ${testName}`);
      }
    }

    console.log(
      `\nSummary: Updated ${updatedCount} fixtures, ${notFoundCount} not found`
    );

    if (notFoundCount.length !== 0) {
      console.error(
        '\nFailed to update snapshots, could not find:\n' + notFound.join('\n')
      );
      process.exit(1);
    }

    // Step 4: Update snapshots
    if (!updateSnapshots()) {
      console.error('\nFailed to update snapshots');
      process.exit(1);
    }

    // Step 5: Verify all tests pass
    if (!verifyAllTestsPass()) {
      console.error('\nVerification failed: Some tests are still failing');
      process.exit(1);
    }

    console.log('\nSuccess! Feature flag enabled and all tests passing.');
    console.log(`\nSummary:`);
    console.log(`  - Enabled "${flagName}" in Environment.ts`);
    console.log(`  - Updated ${updatedCount} fixture files with pragma`);
    console.log(`  - All tests passing`);

    process.exit(0);
  } catch (error) {
    console.error('\nFatal error:', error.message);
    console.error(error.stack);
    process.exit(1);
  }
}