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[WIP] feat: Add native SourceMap support #819

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[WIP] feat: Add native SourceMap support #819

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bartlomieju
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bartlomieju
bartlomieju commented Jul 11, 2024
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core/ops_builtin_v8.rs Outdated Show resolved Hide resolved
core/runtime/jsruntime.rs Outdated Show resolved Hide resolved
core/source_map.rs Outdated Show resolved Hide resolved
bartlomieju
bartlomieju commented Jul 11, 2024
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bartlomieju commented Jul 11, 2024
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bartlomieju commented Jul 11, 2024
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@bartlomieju bartlomieju mentioned this pull request Jul 12, 2024
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bartlomieju added a commit that referenced this pull request Jul 12, 2024
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refactor: Simplify SourceMapGetter and SourceMapper (#821)
b5218a5 
Splitting out a simplification from
#819.
@bartlomieju bartlomieju mentioned this pull request Jul 13, 2024
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bartlomieju added a commit that referenced this pull request Jul 15, 2024
@bartlomieju
feat: Depcrate SourceMapGetter, move methods to ModuleLoader (#823)
b4d48a1 
This commit deprecates `SourceMapGetter` trait,
`JsRuntime::source_map_getter`
option and updates `ModuleLoader` trait to have the same methods as
`SourceMapGetter`.

In real usage it's always implementor of `ModuleLoader` that also
implements
`SourceMapGetter`. It makes little sense to keep these two trait
separate.

This will open up doors for native source map support that is being
developed in #819.

`SourceMapGetter` is scheduled to be removed in 0.297.0.
@bartlomieju
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sourceMapURL being a "bare" url (like bar.js.map) is currently not handled properly by any loader.

I think I'm gonna change ModuleLoader::get_source_map to be two separate functions:

  • ModuleLoader::get_source_map_for_file() - last ditch effort to get a source map for particular file_name - this is mechanism deno CLI uses right now, by stripping out sourceMapURL before passing source code to V8
  • ModuleLoader::load_source_map(file_name: &str) - given a resolved URL synchronously return a source map file. Given that most often the URL in sourceMapURL is actually not a relative URL (eg. bar.js.map) a bit of logic is required in SourceMapper to append ./ to that value and trying to resolve it again. I'm still thinking how to handle it best.

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sourceMapURL being a "bare" url (like bar.js.map) is currently not handled properly by any loader.

I think we have that in Preact. We've gotten reports for a while that the source maps don't load (outside of Deno) and this could explain why. I didn't know that the paths were expected to begin with ./ 👀

@bartlomieju
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sourceMapURL being a "bare" url (like bar.js.map) is currently not handled properly by any loader.

I think we have that in Preact. We've gotten reports for a while that the source maps don't load (outside of Deno) and this could explain why. I didn't know that the paths were expected to begin with ./ 👀

I don't think it's expected to being with ./ - most tools put ULR like bar.js.map there. What I meant be my comment is that our loaders need to be updated to handle such "url". Basically if the parsing fails, we should prepend ./ and try to resolve it against the file that url is in.

bartlomieju
bartlomieju commented Jul 17, 2024
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core/error.rs
Comment on lines -361 to -547
if !file_name.trim_start_matches('[').starts_with("ext:") {
source_line = source_mapper.get_source_line(file_name, line_number);
source_line_frame_index = Some(i);
break;
}
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Verify this in a separate PR. We support source maps for ext: modules so most likely this is not needed

bartlomieju
bartlomieju commented Jul 17, 2024
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bartlomieju commented Jul 17, 2024
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bartlomieju
bartlomieju commented Jul 17, 2024
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core/source_map.rs Outdated
Comment on lines 133 to 136
let source_map = if let Some(b64) =
source_map_string.strip_prefix("data:application/json;base64,")
{
let decoded_b64 = BASE64_STANDARD.decode(b64).ok()?;
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This code is duplicated in CLI, maybe we can have a common helper shared between the two?

@bartlomieju bartlomieju mentioned this pull request Jul 29, 2024
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@bartlomieju @marvinhagemeister @devsnek