Function append

scripts/run-javascript-canvas-debug.mjs:37–44

(line)

let suiteFinished = false;

function append(line) {
  const text = `[playwright] ${line}\n`;
  if (logFile) {
    fs.appendFileSync(logFile, text, 'utf8');
  } else {
    process.stdout.write(text);
  }
}

function writePngFromDataUrl(targetPath, dataUrl) {
  const comma = String(dataUrl || '').indexOf(',');