sveltejs/svelte-preprocess

Sourcemap not preserved when using external HTML/JS

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#382 opened on Jul 6, 2021

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bughelp wanted

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Description

Describe the bug

When using external HTML/JS files, it seems that sourcemaps are not preserved, even with all sourcemap options set to true (on svelte options, rollup options, and svelte-preprocess options).

Using a single .svelte file instead of external HTML/JS files seems to fix the issue.

To Reproduce

I wrote a minimal repro. To run it:

git clone https://gist.github.com/4a7b3e5cb94626a97352435de79fbfac.git repro
cd repro
npm i
npm start

Then go to localhost:8080 and open the Chrome DevTools.

Expected behavior

The DevTools should show the actual line of code with the debugger statement. Instead, it shows the .svelte file which just lists the external resources:

Screenshot from 2021-07-06 08-27-06

Information about your project:

Chrome 91, Ubuntu 20.04, svelte-preprocess 4.7.3, Rollup 2.52.7

Contributor guide

Research direction
Trace the preprocessing pipeline for external HTML/JS files and identify where sourcemaps are dropped. Check the rollup plugin integration and svelte preprocess sourcemap handling.
Tech stack
javascripttypescriptsvelte
Domain
developer experiencebuild system
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Sveltesourcemaps
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40