gulpfile.js

'use strict';

const eslint = require('gulp-eslint');

const build = require('@microsoft/sp-build-web');

build.addSuppression(`Warning - [sass] The local CSS class 'ms-Grid' is not camelCase and will not be type-safe.`);

build.tslintCmd.enabled = false;

const eslintSubTask = build.subTask('eslint', function (gulp, buildOptions, done) {
  return gulp.src(['src/**/*.{ts,tsx}'])
    // eslint() attaches the lint output to the "eslint" property
    // of the file object so it can be used by other modules.
    .pipe(eslint())
    // eslint.format() outputs the lint results to the console.
    // Alternatively use eslint.formatEach() (see Docs).
    .pipe(eslint.format())
    // To have the process exit with an error code (1) on
    // lint error, return the stream and pipe to failAfterError last.
    .pipe(eslint.failAfterError());
});

build.rig.addPreBuildTask(build.task('eslint-task', eslintSubTask));

build.initialize(require('gulp'));