[collin-thomas]

Follow-up to the fidelity failure on #148. Independent of that PR; based on main.

What was wrong

With minify.html on, each component instance rendered from a server or stream script is minified on its own, while the build minifies the page once. Where two instances were written with nothing between them, the request-time bytes could differ from the build's:

• In a table, a removed comment leaves an empty <!----> separator. The space between two inline instances landed before the separator (</a> <!----> <a>) where the build puts it after (</a><!----> <a>).
• An instance that leaves nothing at its edge (empty, or only comments and whitespace) was treated as its neighbor's neighbor, so the instance beside it kept a space the build drops, or two spaces where the build keeps one.

These are byte differences. A browser renders both forms the same.

What it was not

A comment at the top of a component file does not reach this code in a real build: component files are minified as they are loaded, so the comment is already gone. The fidelity test hit it because it loaded each root's components once (with minify.html off for the first root) and reused that list for variants that build with it on.

Changes

• request-render.ts: the usage finalizer resolves each instance's neighbors past instances that leave nothing, then merges the whitespace and separators at each seam the way the build treats that stretch. One pass over the pieces' edges.
• component-manifest-fidelity.integration.test.ts: components are loaded per variant, under that variant's config.

Tests

• A matrix of 16 instance shapes (comments before, after and around inline, block and text roots; empty and whitespace-only instances), every pair plus some triples, in six placements (table cell, formatting element, <pre>, paragraph), each compared with minifyHtml of the same bytes.
• A fast-check property over random instance sequences and surrounding author text, 3,000 runs.
• Five of these fail without the renderer change.

Verification

• pkg unit: 8,776 pass
• pkg integration: pass (809)
• pkg linear-time: 475 pass
• Cloudflare adapter unit: 563 pass; Netlify adapter unit: 77 pass
• typecheck, format, spelling: clean

🤖 Generated with Claude Code

[collin-thomas]

Superseded by the PR from fix-request-render-seam-whitespace: renaming the branch (the shop-preview environment does not deploy branch names with a slash) closed this one.