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fix: compile-check svelte variants at publish time

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Field failure (Codex session, 2026-07-28): the agent kept the seeded
stub style block and appended its own second top-level style element in
all three variants. Svelte forbids that, so the user saw a red Vite
compile overlay; the mount-ack loop then self-healed (failure event,
repair, republish, clean accept), but the overlay window is exactly the
kind of thing the user should never see.

The publish gate closes the class: a done reply for a component session
now compile-checks every variant with the app's own compiler BEFORE the
revision bump and the browser broadcast. Failures bounce as a 422 with
file, line, and message plus _instructions; live-poll surfaces the
details in the thrown reply error. The browser never imports a variant
that cannot compile.

Also: the stub guard comments warn that all CSS belongs in the single
existing style block, worded to never contain the literal "<style"
sequence (a mention inside a CSS comment truncates the string surgery
agents use to find the block; the fake test agent caught exactly that).
The JIT svelte instructions carry the same warning.

This work was produced with AI assistance (Claude Code).

Co-Authored-By: Claude Code <noreply@anthropic.com>
This commit is contained in:
Paul Bakaus
2026-07-28 14:13:47 -07:00
co-authored by Claude Code
parent da68678e7e
commit dc5420b64f
5 changed files with 131 additions and 5 deletions
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skill/scripts/live/instructions.mjs
+1 -1
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@@ -88,7 +88,7 @@ function generateInstructions(event, scriptsPath) {
function svelteComponentInstructions(event, scaffold, scriptsPath) {
const dir = scaffold.componentDir;
const count = event.count;
return `Svelte component preview. EDIT the existing stubs ${dir}/v1.svelte ... v${count}.svelte in place; never delete or recreate them; do not read them back (the prop-substituted markup is in scaffold.componentStubMarkup). Keep the stub's control flow ({#each}, {#if}) and propContract prop names exactly; never flatten a loop into literal items. The stub <style> is seeded with the source rules that style the selection; restyle or delete freely, and know that any seeded rule you do not re-declare is REMOVED from source on accept (the preview never applied it). Semantic class selectors only: no @scope, no data-impeccable-* attributes. Params go in ${dir}/params.json keyed by variant number (never an attribute); author knob CSS against var(--p-<id>, default) and :global([data-p-<id>="..."]). Reply with --file ${scaffold.file}. Accept later merges everything into ${scaffold.sourceFile} mechanically; you have no post-accept cleanup.`;
return `Svelte component preview. EDIT the existing stubs ${dir}/v1.svelte ... v${count}.svelte in place; never delete or recreate them; do not read them back (the prop-substituted markup is in scaffold.componentStubMarkup). Keep the stub's control flow ({#each}, {#if}) and propContract prop names exactly; never flatten a loop into literal items. The stub <style> is seeded with the source rules that style the selection; restyle or delete freely, and know that any seeded rule you do not re-declare is REMOVED from source on accept (the preview never applied it). ALL your CSS goes inside that ONE existing <style> block: Svelte forbids a second top-level style element, and a publish with a non-compiling variant is bounced back to you with file and line. Semantic class selectors only: no @scope, no data-impeccable-* attributes. Params go in ${dir}/params.json keyed by variant number (never an attribute); author knob CSS against var(--p-<id>, default) and :global([data-p-<id>="..."]). Reply with --file ${scaffold.file}. Accept later merges everything into ${scaffold.sourceFile} mechanically; you have no post-accept cleanup.`;
}
function deferredWrapperInstructions(event, scaffold, scriptsPath) {