Created
May 15, 2014 16:54
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Example error handling in a gulpfile
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| var gulp = require('gulp'); | |
| var gutil = require('gulp-util'); | |
| var jshint = require('gulp-jshint'); | |
| // Command line option: | |
| // --fatal=[warning|error|off] | |
| var fatalLevel = require('yargs').argv.fatal; | |
| var ERROR_LEVELS = ['error', 'warning']; | |
| // Return true if the given level is equal to or more severe than | |
| // the configured fatality error level. | |
| // If the fatalLevel is 'off', then this will always return false. | |
| // Defaults the fatalLevel to 'error'. | |
| function isFatal(level) { | |
| return ERROR_LEVELS.indexOf(level) <= ERROR_LEVELS.indexOf(fatalLevel || 'error'); | |
| } | |
| // Handle an error based on its severity level. | |
| // Log all levels, and exit the process for fatal levels. | |
| function handleError(level, error) { | |
| gutil.log(error.message); | |
| if (isFatal(level)) { | |
| process.exit(1); | |
| } | |
| } | |
| // Convenience handler for error-level errors. | |
| function onError(error) { handleError.call(this, 'error', error);} | |
| // Convenience handler for warning-level errors. | |
| function onWarning(error) { handleError.call(this, 'warning', error);} | |
| var testfiles = ['error.js', 'warning.js']; | |
| // Task that emits an error that's treated as a warning. | |
| gulp.task('warning', function() { | |
| gulp.src(testfiles). | |
| pipe(jshint()). | |
| pipe(jshint.reporter('fail')). | |
| on('error', onWarning); | |
| }); | |
| // Task that emits an error that's treated as an error. | |
| gulp.task('error', function() { | |
| gulp.src(testfiles). | |
| pipe(jshint()). | |
| pipe(jshint.reporter('fail')). | |
| on('error', onError); | |
| }); | |
| gulp.task('watch', function() { | |
| // By default, errors during watch should not be fatal. | |
| fatalLevel = fatalLevel || 'off'; | |
| gulp.watch(testfiles, ['error']); | |
| }); | |
| gulp.task('default', ['watch']); |
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