Source map not gets generated if use gulp concat

[abhisinha-ui]

Hi please look on below code
gulp.src([ '!./app/**/*-test.js', '!./app/app/app-config.js', './app/app/app-config-dev.js', './app/**/*.js', './http-backend/http-backend.js', './http-backend/**/*.js', '../../ui-libs/niapp/app-controller.js', '!../../ui-libs/**/*test.js', '!../../ui-libs/vendors/**/*.js', '../../ui-libs/**/*.js' ]) .pipe(sourcemaps.init()) .pipe(plugins.concat('app.js')) .pipe(sourcemaps.write('.')) .pipe(gulp.dest(dest.js));

But In browser source-map is not getting generated . Only app.js file is getting generated no sourcemap is getting generated . Please Help

[phated]

@abhisinha-ui please provide a minimal reproduction repository.