Gulp-inject transform doesn't work

Question

I've tried to setup gulp-inject to inject dependencies into index.html. Everything works fine except transform function. I need to replace part of filepath in the following way: /frontend/src/ --> /static/ I've tried to do it like this (copy-pasted from somewhere):

transform : function ( filePath, file, i, length ) {
                var newPath = filePath.replace('/frontend/src', '');
                console.log('inject script = '+ newPath);
                return '<script src="/static/' + newPath  + '"></script>';
            }

After executing, I have nothing (except standard gulp output) in the console, and un-transformed filepath appears in result file. Looks like my custom transform just doesn't run, and the default transform works instead.

Answer 1

The following is working for me even with multiple levels (/**/*.js instead of /*.js):

gulp.task('inject', function() {
    gulp.src('./test.html')
        .pipe(inject(
            gulp.src(['./Content/js/*.js'], {read: false }),
            {
                transform: function (filePath, file, i, length) {
                    var newPath = filePath.replace('/Content/js/', '');
                    console.log('inject script = '+ newPath);
                    return '<script src="/static/' + newPath  + '"></script>';
                }
            })
        )
        .pipe(gulp.dest('./'));
});