Taglib Wasm Preflight

TagLib-Wasm Preflight

Overview

scripts/release-safe.sh (deno task release) automates mechanical checks: fmt, lint, typecheck, tests, Wasm freshness, deno publish --dry-run, publint, arethetypeswrong, npm pack --dry-run, version sync. It cannot make judgment calls. This skill covers what you must decide before invoking the script.

Core principle: The script blocks bad releases. The skill prevents bad releases from being attempted.

When to Use

• Before running deno task release or deno task release <version>
• Before cutting any git tag matching v*
• Especially when the user supplies a version number — verify it before honoring it

1. Semver Decision

Violating the letter of semver is violating the spirit of semver. Classify the release by inspecting the diff, not by trusting the user-supplied number. If a user-proposed version conflicts with your classification, STOP and surface the conflict before doing anything else.

LAST_TAG=$(git describe --tags --abbrev=0)
git log "$LAST_TAG"..HEAD --oneline
git diff "$LAST_TAG"..HEAD -- index.ts simple.ts folder.ts web.ts rating.ts src/types.ts

Rationalizations to reject

2. Public API Diff

LAST_TAG=$(git describe --tags --abbrev=0)
for entry in index.ts simple.ts folder.ts web.ts rating.ts; do
  diff <(git show "$LAST_TAG:$entry" 2>/dev/null | deno doc - 2>/dev/null) \
       <(deno doc "$entry" 2>/dev/null) || true
done

Confirm every added/removed/changed export is intentional and matches your semver classification from §1.

3. Knip Triage

deno task knip

Each finding is a review item, not an auto-delete:

• Unused export in a public entry file (index.ts, simple.ts, etc.) → almost certainly intentional (library surface). Add to knip.json ignore.
• Unused dep listed in deno.json imports → verify it isn't used by tests/ or via dynamic import before removing.
• Unused file → check git log -- <file> for context; deleted features sometimes leave callable-but-unused files.

4. Coverage Threshold (CLAUDE.md target: 80%)

rm -rf cov_profile && \
  deno test --coverage=cov_profile --allow-read --allow-write --allow-env \
    --v8-flags=--expose-gc tests/ && \
  deno coverage cov_profile

If overall < 80%: either add tests, or document the regression and reason in release notes. Do not silently ship below threshold.

5. Wasm Size Delta (especially after lib/taglib bumps)

LAST_TAG=$(git describe --tags --abbrev=0)
for w in build/taglib-web.wasm build/taglib-wasi.wasm; do
  OLD=$(git show "$LAST_TAG:$w" 2>/dev/null | wc -c)
  NEW=$(wc -c < "$w")
  echo "$w: $OLD -> $NEW ($(( (NEW - OLD) * 100 / OLD ))%)"
done

Any growth >5% needs an identified cause (new feature, upstream change). Unexplained growth = stop and investigate.

6. Beads State

bd ready                       # any P0/P1 ready that should block?
bd list --status=in_progress   # anything critical mid-flight?

Tag only when the beads state reflects what you're shipping.

No bd dolt push. This project uses local embedded Dolt with no sync remote (see .beads/config.yaml). There is no beads push step — and do NOT add one pointing at the public GitHub repo: it would leak Dolt refs (refs/dolt/data and a visible __dolt_remote_info__ branch) into it. Beads data lives only in the local embedded DB plus the .beads/ JSONL backup.

7. Release Notes

Draft notes covering: new features, fixes, breaking changes, deprecations. For new public API, include a usage example. Match the detail of MEMORY.md release entries.

Docs accuracy: this skill covers code, not prose. For the docs, run the companion /taglib-wasm-preflight-docs (tiered: 1 quick API-sync / 2 +examples / 3 full). At minimum run Tier 1 when the release changed the public API, so a new or changed export doesn't ship undocumented (deno task docs:coverage is the mechanical check).

After Preflight Passes

deno task release <version>    # or deno task release for auto-patch

Red Flags — STOP

• User supplied a version; you didn't verify it against the diff
• deno task knip shows new findings you haven't triaged
• Coverage dropped vs. last release with no explanation
• Wasm size grew >5% with no identified cause
• Submodule bump but git status shows clean build/*.wasm (not rebuilt)
• "Let's use release:quick to skip these checks" — only valid if this preflight ran in the last hour and nothing changed

All of these mean: pause, finish the checklist, then release.