Function onChange

compiler/packages/snap/src/runner.ts:118–161

(
  worker: Worker & typeof runnerWorker,
  state: RunnerState,
)

// Callback to re-run tests after some change
async function onChange(
  worker: Worker & typeof runnerWorker,
  state: RunnerState,
) {
  const {compilerVersion, isCompilerBuildValid, mode, filter} = state;
  if (isCompilerBuildValid) {
    const start = performance.now();

    // console.clear() only works when stdout is connected to a TTY device.
    // we're currently piping stdout (see main.ts), so let's do a 'hack'
    console.log('\u001Bc');

    // we don't clear console after this point, since
    // it may contain debug console logging
    const results = await runFixtures(
      worker,
      mode.filter ? filter : null,
      compilerVersion,
    );
    const end = performance.now();
    if (mode.action === RunnerAction.Update) {
      update(results);
      state.lastUpdate = end;
    } else {
      report(results);
    }
    console.log(`Completed in ${Math.floor(end - start)} ms`);
  } else {
    console.error(
      `${mode}: Found errors in Forget source code, skipping test fixtures.`,
    );
  }
  console.log(
    '\n' +
      (mode.filter
        ? `Current mode = FILTER, filter test fixtures by "${FILTER_PATH}".`
        : 'Current mode = NORMAL, run all test fixtures.') +
      '\nWaiting for input or file changes...\n' +
      'u     - update all fixtures\n' +
      `f     - toggle (turn ${mode.filter ? 'off' : 'on'}) filter mode\n` +
      'q     - quit\n' +
      '[any] - rerun tests\n',
  );
}

/**
 * Runs the compiler in watch or single-execution mode