Function launchEditor

packages/react-devtools-core/src/editor.js:143–194

(
  maybeRelativePath: string,
  lineNumber: number,
  absoluteProjectRoots: Array<string>,
)

}

export function launchEditor(
  maybeRelativePath: string,
  lineNumber: number,
  absoluteProjectRoots: Array<string>,
) {
  const filePath = getValidFilePath(maybeRelativePath, absoluteProjectRoots);
  if (filePath === null) {
    return;
  }

  // Sanitize lineNumber to prevent malicious use on win32
  // via: https://github.com/nodejs/node/blob/c3bb4b1aa5e907d489619fb43d233c3336bfc03d/lib/child_process.js#L333
  if (lineNumber && isNaN(lineNumber)) {
    return;
  }

  const [editor, ...destructuredArgs] = guessEditor();
  if (!editor) {
    return;
  }

  let args = destructuredArgs;

  if (lineNumber) {
    args = args.concat(getArgumentsForLineNumber(editor, filePath, lineNumber));
  } else {
    args.push(filePath);
  }

  if (childProcess && isTerminalEditor(editor)) {
    // There's an existing editor process already and it's attached
    // to the terminal, so go kill it. Otherwise two separate editor
    // instances attach to the stdin/stdout which gets confusing.
    // $FlowFixMe[incompatible-use] found when upgrading Flow
    childProcess.kill('SIGKILL');
  }

  if (process.platform === 'win32') {
    // On Windows, launch the editor in a shell because spawn can only
    // launch .exe files.
    childProcess = spawn('cmd.exe', ['/C', editor].concat(args), {
      stdio: 'inherit',
    });
  } else {
    childProcess = spawn(editor, args, {stdio: 'inherit'});
  }
  childProcess.on('error', function () {});
  // $FlowFixMe[incompatible-use] found when upgrading Flow
  childProcess.on('exit', function () {
    childProcess = null;
  });
}