Function diffTentative

build-system/common/diff.js:15–27

(filepath, content, gitDiffFlags = ['-U1'])

 * @return {!Promise<string>}
 */
const diffTentative = (filepath, content, gitDiffFlags = ['-U1']) =>
  tempy.write.task(content, (temporary) =>
    getStdout(
      [
        'git -c color.ui=always diff',
        ...gitDiffFlags,
        filepath,
        temporary,
      ].join(' ')
    )
      .trim()
      .replace(new RegExp(temporary, 'g'), `/${filepath}`)
  );

/**
 * Diffs a file against new content.