A gulp plugin which forces a task to fail.
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README.md

gulp-fail NPM Package Build Status

Forces a gulp task to fail. (Works great with gulp-if!)

Insallation

$ npm install --save-dev gulp-fail

Usage

NOTE: It really makes most sense to use this plugin with gulp-if in almost all cases.

No Message Given

var fail   = require('gulp-fail');
var gulpIf = require('gulp-if');

var condition = true;


// Will fail with a generic message as to why.
gulp.task('mytask', function() {
  return gulp.src('**/*.js')
             .pipe(gulpIf(condition, fail()));
})

Custom Message

var fail   = require('gulp-fail');
var gulpIf = require('gulp-if');

var condition = true;


// Will fail with the given message shown as the reason.
gulp.task('mytask', function() {
  return gulp.src('**/*.js')
             .pipe(gulpIf(condition, fail("It failed cause I told it to! ...Hooray?")));
})

Message Function

var fail   = require('gulp-fail');
var gulpIf = require('gulp-if');

var condition = true;


// Will fail with the message returned by the function passed to `fail`.
gulp.task('mytask', function() {
  return gulp.src('**/*.js')
             .pipe(gulpIf(condition, fail(function() {
               var message = "";

               // do some stuff to determine what the message will be

               return message;
             })));
})

Advanced Usage (JSHint and JSCS)

var fail        = require('gulp-fail');
var gulpIf      = require('gulp-if');
var jshint      = require('gulp-jshint');
var jscs        = require('gulp-jscs');
var jscsStylish = require('gulp-jscs-stylish');


// Will fail without duplicating the jscs error messages.
gulp.task('lint', function() {
  var jscsFailed = false;

  return gulp.src('**/*.js')
             .pipe(jshint())
             .pipe(jscs())
             .pipe(jscsStylish.combineWithHintResults())
             .pipe(jshint.reporter('jshint-stylish'))
             .pipe(gulpIf(function(file) {
               return ((file.jscs && !file.jscs.success)
                        || (file.jshint && !file.jshint.success));
             }, fail("Linting finished with errors!", true)));
})

API

fail([message], [failAfterCompletion])

  • message String|Function

    The error message used the task is forced to fail. This can be a string or a function. If a function is given, it is expected to return a String.

  • failAfterCompletion Boolean

    If true, the stream will complete it's journey through every pipe before the fail occurs. This was added because of plugins like gulp-jscs and gulp-jscs-stylish (See the example above).

License

The MIT License (MIT)

Copyright (c) 2016 Brandon Sara (http://bsara.github.io)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.