Gulp SourceMaps not working when using gulp-gzip

Question

I am using Gulp to uglify javascript files and generate their source map. So far so good:

var gulp = require('gulp');
var plugins = require('gulp-load-plugins')();

gulp.task('compress-js', ['clean-js'], function() {
  return gulp.src('./resources/js/**/*.js')
    .pipe(plugins.sourcemaps.init())
    .pipe(plugins.uglify())
    .pipe(plugins.rename({extname: '.min.js'}))
    .pipe(plugins.sourcemaps.write('./maps'))
    .pipe(gulp.dest('./public/js'))
    .pipe(plugins.livereload());
});

This code generates the following output folders and files, which are correctly loaded by the browser:

public/js/someScript.min.js

function doSomeStuff(){console.log("This stuff function simply says: hello!!")
//# sourceMappingURL=maps/someScript.min.js.map

public/js/maps/someScript.min.js.map: Notice this file is referenced in the line above.

However I would also like to gzip them so my updated gulpfile.js is:

gulp.task('compress-js', ['clean-js'], function() {
  return gulp.src('./resources/js/**/*.js')
    .pipe(plugins.sourcemaps.init())
    .pipe(plugins.uglify())
    .pipe(plugins.rename({extname: '.min.js'}))
    .pipe(plugins.sourcemaps.write('./maps'))
    .pipe(plugins.gzip())
    .pipe(gulp.dest('./public/js'))
    .pipe(plugins.livereload());
});

Now I get these files:

public/js/someScript.min.js.gz

function doSomeStuff(){console.log("This stuff function simply says: hello!!")}
//# sourceMappingURL=maps/someScript.min.js.map

public/js/maps/someScript.min.js.map.gz

The source map is not being linked because, the js.gz file references someScript.min.js.map instead of someScript.min.js.map.gz. What am I missing? How can I make the file reference the correct extension?

score 4 · Accepted Answer · answered Jul 23 '15 at 12:42

I managed to solve this by renaming the generated map files, removing the .gz extension:

gulp.task('compress-js', function(cb) {
  gulp.src('./resources/js/**/*.js')
    .pipe(plugins.jshint())
    .pipe(plugins.sourcemaps.init())
    .pipe(plugins.uglify())
    .pipe(plugins.rename({extname: '.min.js'}))
    .pipe(plugins.sourcemaps.write('./maps'))
    .pipe(plugins.gzip({ append: true }))
    .pipe(gulp.dest('./public/js'))
    .pipe(plugins.livereload())
    .on('end', function() {
        postProcessMapFiles('./public/js/maps/**/*.map.gz', './public/js/maps', cb);
    });
});

function postProcessMapFiles(compressedMapFiles, publicDir, cb){
    gulp.src(compressedMapFiles)
       .pipe(plugins.debug())
       .pipe(plugins.rename({extname: ''}))
       .pipe(plugins.debug())
       .pipe(gulp.dest(publicDir))
       .on('end', function() {
          del([compressedMapFiles], cb);
       });
}

score 0 · Answer 2 · answered May 14 '18 at 14:04

i did gunzip the map file.

var gunzip = require('gulp-gunzip');

// this task will depend on task sass, that generates the problem
gulp.task('uncompress_map', ['sass'], function () {
    var maploc = 'src/build/maps';
    return gulp.src(maploc+'/*.gz')
        .pipe(gunzip())
        .pipe(gulp.dest(maploc));
});

Gulp SourceMaps not working when using gulp-gzip

2 Answers2