I faced similar issue when trying to debug my Angular2 app running in Chrome in Visual Studio Code (Using Debugger for Chrome extension)
I use gulp as my task runner and my setup is as follows:
Typescript files -> tsc -> intermediate es5 js -> browserify (plus uglify in production build) -> compiled bundle
My directory structure is as follows:
|- src
|- my .ts files here
|- main.ts - my entry file
|- dist
|- intermediate files go here
|- web
|- app.js - final bundle
|- app.js.map - final bundle map
|- gulpfile.js
gulpfile.js
:
var gulp = require('gulp'),
tsc = require('gulp-typescript'),
browserify = require('browserify'),
uglify = require('gulp-uglify'),
sourcemaps = require('gulp-sourcemaps'),
source = require('vinyl-source-stream'),
buffer = require('vinyl-buffer');
gulp.task('tsc', [], () => {
return gulp.src(['src/**/*.ts'])
.pipe(sourcemaps.init())
.pipe(tsc({
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"lib": [ "es2015", "dom" ],
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
}))
.pipe(sourcemaps.write(null, {
"sourceRoot": function(file) {
let parts = file.relative.split('\\');
let root = Array(parts.length + 1).join('../') + 'src';
return root;
}
}))
.pipe(gulp.dest('dist/'));
});
gulp.task('bundle', ['tsc'], () => {
let b = browserify({
entries: 'dist/main.js',
debug: true,
});
return b.bundle()
.pipe(source('app.js'))
.pipe(buffer())
.pipe(sourcemaps.init({loadMaps: true}))
.pipe(sourcemaps.write('./', {
"sourceRoot": "../",
}))
.pipe(gulp.dest('web/'));
})
gulp.task('default', ['bundle']);
Explanation/reasoning:
For some reason browserify
doesn't read and parse .js.map files linked in .js file (via special comment at the end) but it does when the source map is embedded in js file. So, by passing null
instead of path to sourcemaps
it will embed it at the end of generated .js file.
Next issue I noticed was that sourcemaps
doesn't automatically follow directory structure (add '../' to sourceRoot when it goes to next directory level), so I made a quick function to complement this. Keep in mind that it only works on Windows - on Linux you'd have to change split character.
function(file) {
let parts = file.relative.split('\\'); // put '/' here on Linux
let root = Array(parts.length + 1).join('../') + 'src';
return root;
}
Certainly there is a way to detect correct path separator, I'm debugging only on Windows thus it's not important for my purposes.
I hope it helps someone, cause I've spent whole Sunday morning tracking down this problem.