gulpfile.js

const gulp = require('gulp');
const format = require('gulp-clang-format');
const clangFormat = require('clang-format');
const srcsToFmt = ['{src,test}/*.{js,ts}', '*.js'];

gulp.task(
    'format:enforce',
    () => gulp.src(srcsToFmt).pipe(
        format.checkFormat('file', clangFormat, {verbose: true, fail: true})));

gulp.task(
    'format',
    () => gulp.src(srcsToFmt, {base: '.'})
              .pipe(format.format('file', clangFormat))
              .pipe(gulp.dest('.')));