linked node_modules source maps are mixed w/ project

[ewingrj]

🐛 bug report

I am trying to include sourcemaps for a dependency that has been linked. npm link mydep

This is working with the caveat that the sourcemaps appear under the same root src/ in chrome devtools. This is a problem b/c the linked node_module sourcemaps appear mixed with my applications sourcemaps and will be overwritten by my app if any conflicts exist.

possibly related to #1801?

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

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "modules": false,
        "targets": {
          "browsers": [
            "> 1%",
            "last 3 versions",
            "ie >= 9",
            "ios >= 8",
            "android >= 4.2"
          ]
        },
        "useBuiltIns": false
      }
    ]
  ],
  "plugins": [
    ["styled-components", { "displayName": true }],
    "@babel/plugin-proposal-class-properties"
  ]
}

🤔 Expected Behavior

I would expect any sourcemaps found for node_modules would be served at a different root. See next section for an example

😯 Current Behavior

currently they are served from the same /src root.

ex.

app

-- src
  -- index.js

mydep

-- src
  -- index.js
  -- cache
    -- index.js

The source maps in chrome devtools will appear as:

-- src
  -- index.js (this is from app)
  -- cache
    -- index.js (this is from mydep)

I would expect them to appear as:
The source maps in chrome devtools will appear as:

-- mydep (or even as a sub dir of node_modules)
  -- index.js
  -- cache
    -- index.js
-- src
  -- index.js

💁 Possible Solution

🔦 Context

Being able to correctly view sourcemaps for linked dependencies is useful when attempting to debug a package.

💻 Code Sample

just link any node_module w/ built source maps to your app

🌍 Your Environment

Software	Version(s)
Parcel	1.10.1
Node	v8.11.3
npm	6.4.1
Operating System	macos

[mischnic]

Current situation:
parcel build index.html (correct):

parcel index.html (wrong):

#2489 will fix this remaining problem