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8000 feat(parse/html): support vue directive syntax by dyc3 · Pull Request #7673 · biomejs/biome · GitHub
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@dyc3 dyc3 commented Oct 3, 2025

Summary

This PR adds support for parsing vue directives in .vue files.

It's still a WIP, the parser should be finished, but the lexer needs to be a little smarter in order to emit the right tokens.

Test Plan

Added tests.

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@github-actions github-actions bot added A-CLI Area: CLI A-Core Area: core A-Project Area: project A-Linter Area: linter A-Parser Area: parser A-Formatter Area: formatter A-Tooling Area: internal tools A-LSP Area: language server protocol L-JavaScript Language: JavaScript and super languages L-CSS Language: CSS L-JSON Language: JSON and super languages A-Diagnostic Area: diagnostocis L-HTML Language: HTML L-Grit Language: GritQL A-Type-Inference Area: type inference labels Oct 3, 2025
@dyc3 dyc3 force-pushed the html-vue-syntax branch from 17d6bc1 to 4485ec0 Compare October 7, 2025 20:21
@dyc3 dyc3 force-pushed the html-vue-syntax branch from 4485ec0 to 0fba4d9 Compare October 7, 2025 20:30
@github-actions github-actions bot removed A-Core Area: core A-Project Area: project A-Linter Area: linter A-LSP Area: language server protocol L-CSS Language: CSS A-Diagnostic Area: diagnostocis L-Grit Language: GritQL A-Type-Inference Area: type inference labels Oct 7, 2025
Comment on lines +195 to +197
VueDirective
| VueVBindShorthandDirective
| VueVOnShorthandDirective
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Usually a Any* node should have a bogus node as part of the variants


// <div @click="onClick" />
// ^^^^^^^^^^^^^^^^
VueVOnShorthandDirective =
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Where there's a VOn in the name?

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@click is shorthand for v-on:click

Comment on lines +868 to +869
&& byte != b':'
&& byte != b'.'
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What's this for?

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It's to stop consume_identifier from progressing when it encounters those, and get the lexer to emit them as their own tokens.

It would probably make more sense to have another lex context InsideTagVue to gate this behavior behind.

let m = p.start();

p.bump_with_context(T![.], HtmlLexContext::InsideTag);
p.bump_with_context(HTML_LITERAL, HtmlLexContext::InsideTag);
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Suggested change
p.bump_with_context(HTML_LITERAL, HtmlLexContext::InsideTag);
p.expect_with_context(HTML_LITERAL, HtmlLexContext::InsideTag);

Can't recall if we have this function, but we can't bump without checking first

Comment on lines +36 to +37
parse_vue_directive_argument(p).ok();
VueModifierList.parse_list(p);
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If parse_vue_directive_argument emits an error, it's almost possible that line 37 will fail too. Shouldn't we bail and emit a bogus node? Or are there test that shows that the parsing of modifiers can succeed?

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We should probably bail, yeah

@ematipico
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BTW I fixed the failing test in another branch, so we can ignore it

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A-CLI Area: CLI A-Formatter Area: formatter A-Parser Area: parser A-Tooling Area: internal tools L-HTML Language: HTML L-JavaScript Language: JavaScript and super languages L-JSON Language: JSON and super languages

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