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@noahmiller
Created May 15, 2014 16:54
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Example error handling in a gulpfile
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']);
@dimitardanailov
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Thank you

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