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ref(injection): Rebuild fixup_js_file on top of magic-string and sourcemap composition #1693

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merged 16 commits into from
Aug 3, 2023

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loewenheim
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@loewenheim loewenheim commented Jul 21, 2023

This makes debug id injection into JS files precise.

  1. Find the point where we need to inject by means of a regex that skips a hashbang, comments, empty lines, and a "use strict"; statement.
  2. Use magic-string to insert the debug id code snippet at the injection point and append the //# debugId comment.
  3. Have magic-string give us a sourcemap that maps between the injected and original file. This is really only relevant for the code snippet, the comment is just appended and shouldn't affect mappings anyway.

The sourcemap obtained in (3) is then used to rewrite the original sourcemap using SourceMap::adjust_mappings.

This also minorly refactors fixup_js_file_end.

@loewenheim loewenheim self-assigned this Jul 21, 2023
@loewenheim loewenheim marked this pull request as ready for review August 2, 2023 13:48
@loewenheim loewenheim changed the title ref(injection): Rebuild fixup_js_file on top of magic-string ref(injection): Rebuild fixup_js_file on top of magic-string and sourcemap composition Aug 2, 2023
something else"#;

let m = PRE_INJECT_RE.find(source).unwrap();
dbg!(&source[m.range()]);
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Should we actually assert on something here?

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Forgot to remove that test when I was writing this. I don't think it serves much of a purpose.

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loewenheim and others added 2 commits August 2, 2023 16:51
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That's a beefy change, fingers crossed🤞

@loewenheim loewenheim merged commit e09295f into master Aug 3, 2023
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@loewenheim loewenheim deleted the ref/rework-inject branch August 3, 2023 11:36
loewenheim added a commit that referenced this pull request Aug 3, 2023
loewenheim added a commit that referenced this pull request Aug 3, 2023
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2 participants