Function formatStackTrace

packages/jest-message-util/src/index.ts:341–384

(
  stack: string,
  config: StackTraceConfig,
  options: StackTraceOptions,
  testPath?: string,
)

}

export function formatStackTrace(
  stack: string,
  config: StackTraceConfig,
  options: StackTraceOptions,
  testPath?: string,
): string {
  const lines = getStackTraceLines(stack, options);
  let renderedCallsite = '';
  const relativeTestPath = testPath
    ? slash(path.relative(config.rootDir, testPath))
    : null;

  if (!options.noStackTrace && !options.noCodeFrame) {
    const topFrame = getTopFrame(lines);
    if (topFrame) {
      const {column, file: filename, line} = topFrame;

      if (line && filename && path.isAbsolute(filename)) {
        let fileContent;
        try {
          // TODO: check & read HasteFS instead of reading the filesystem:
          // see: https://github.com/jestjs/jest/pull/5405#discussion_r164281696
          fileContent = fs.readFileSync(filename, 'utf8');
          renderedCallsite = getRenderedCallsite(fileContent, line, column);
        } catch {
          // the file does not exist or is inaccessible, we ignore
        }
      }
    }
  }

  const stacktrace =
    lines.length === 0
      ? ''
      : `\n${lines
          .map(
            line =>
              STACK_INDENT +
              formatPath(trimPaths(line), config, relativeTestPath),
          )
          .join('\n')}`;

  return renderedCallsite + stacktrace;
}

type FailedResults = Array<{
  /** Stringified version of the error */