Parcel: Source mapping not working with typescript

[wingland]

Choose one: a 🐛 bug report

🎛 Configuration (.babelrc, package.json, cli command)

package.json

{
  "name": "vue-ts-parcel",
  "version": "1.0.0",
  "description": "",
  "scripts": {
    "dev": "rm -rf .cache && rm -rf dist && parcel src/index.html",
    "build": "parcel build src/index.html"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "vue": "^2.5.16",
    "vue-class-component": "^6.2.0",
    "vue-property-decorator": "^6.0.0",
    "vue-template-compiler": "^2.5.16"
  },
  "devDependencies": {
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-es2015": "^6.24.1",
    "parcel-bundler": "^1.6.2",
    "parcel-plugin-typescript": "^0.7.0",
    "parcel-plugin-vue": "^1.5.0",
    "tslint": "^5.9.1",
    "typescript": "^2.6.2",
    "typescript-eslint-parser": "^14.0.0"
  }
}

tsconfig.json

{
  "compilerOptions": {
      "module": "es2015",
      "noImplicitAny": true,
      "removeComments": true,
      "moduleResolution": "node",
      "preserveConstEnums": true,
      "sourceMap": true,
      "strict": true,
      "target": "es5",
      "experimentalDecorators": true
  },
  "include": [
      "./src/**/*"
  ],
  "exclude": [
      "node_modules",
      "**/*.spec.ts"
  ],
  "parcelTsPluginOptions": {
    // If true type-checking is disabled
    "transpileOnly": false
  }
}

🤔 Expected Behavior

With the latest version of parcel 1.6.2 , I got parcel index.html working with the js and map file generated in dist. I was expecting the source map working as expected in browser, but it did not.

😯 Current Behavior

The comment pointing to the map file was missing in generated bundle js file. But it was not missing in another project without typescript.

Later I found the source code here removes the comment of "source map URL" for ts asset, and I want to know why.

https://github.com/parcel-bundler/parcel/blob/800268435a8465660f8569f7ba30a94c2b1f75a1/src/assets/TypeScriptAsset.js#L41

💁 Possible Solution

🔦 Context

I want to make source map working with typescript. Is this behavior intended? Is this a bug? And how can I get it works?

💻 Code Sample

🌍 Your Environment

| Software | Version(s) |
| ---------------- | ---------- |
| Parcel | 1.6.2
| Node | 8.9.3
| Yarn | 1.3.2
| Operating System | Mac OSX

[DeMoorJasper]

Parcel takes care of adding source map URL, so we remove it in the typescript parser.

However this is a parcel-plugin-typescript and unrelated to parcel. (The parser used in parcel is ignored and instead the one from parcel-plugin-typescript is used in your case)

[fathyb]

@DeMoorJasper parcel-plugin-vue was responsible, just so you know as you're working on the Vue support

[DeMoorJasper]

@fathyb Thanks for letting me know, I'll make sure sourcemaps work properly in the official vue support