docs(debug-01-08): archive — fix landed, gate completed
Resolves Vite/Rollup CJS-interop tree-shake bug that killed SW init. Two-part fix: - vite.config.ts resolve.alias for ebml -> CJS main entry (52c7636) - tests/background/sw-bundle-import.test.ts chrome.* Proxy mock (74400ae) Full vitest: 61 passing, 2 RED (pre-existing fixture-dependent webm-playback tests; Plan 01-08 Task 5's empirical responsibility). Tier-1 SW-bundle-loadability gate now GREEN. Status: investigating -> resolved. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
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.planning/debug/resolved/01-08-sw-incompatibility.md
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---
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slug: 01-08-sw-incompatibility
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status: resolved
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trigger: |
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Plan 01-08 Tasks 1-4 landed cleanly (5 commits 5035314..aabbd0c, merged
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fast-forward into gsd/phase-01-stabilize-video-pipeline at aabbd0c).
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All gates green: tsc clean, type-safety grep clean, npm run build exit 0,
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60/62 vitest GREEN (only the 2 fixture-dependent webm-playback duration
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tests remain RED — those are Task 5's empirical responsibility).
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Operator ran smoke.sh against the post-remux build and reported: "it
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errored, and i can't even see the SW console" —
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chrome://serviceworker-internals shows the SW at Running Status:
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STARTING (stuck forever), Fetch handler existence: DOES_NOT_EXIST, Log
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empty. The SW dies at top-level module evaluation BEFORE any handler
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registers and before any console.log can fire.
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Initial orchestrator hypothesis ("ts-ebml uses `new Function` + Buffer
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globals → CSP-blocks SW") was speculation from bundle grep and proved
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WRONG when tested. A proper Node-simulation that strips SW-relevant
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globals (`delete globalThis.Buffer; delete globalThis.process; await
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import('./dist/assets/index.ts-8ny38Qcj.js')`) reveals the actual error
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fires at top-level module init:
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TypeError: Cannot read properties of undefined (reading 'readVint')
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at file:///.../dist/assets/index.ts-8ny38Qcj.js:12:33809
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at hn (file:///.../dist/assets/index.ts-8ny38Qcj.js:12:41461)
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at file:///.../dist/assets/index.ts-8ny38Qcj.js:12:42172
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at ModuleJob.run (node:internal/modules/esm/module_job:430:25)
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Bundle context at the failure site:
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i.readVint=i.writeVint=i.readBlock=...=void 0;
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const s=mo, h=a(go()), {tools:f}=Pc, d=Gc;
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i.readVint = f.readVint; // ← throws: f is undefined
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This is the bundled form of ts-ebml/lib/tools.js. The destructure
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`{tools:f}=Pc` fails because `Pc` is an empty placeholder namespace
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object (`var Pc={}` — declared once, never populated). `Pc` is the
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Vite/Rollup-mangled identifier for the `ebml` package (transitive dep
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of ts-ebml; ts-ebml's tools.js does `const { tools: _tools } =
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require("ebml")`).
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Root cause is a Vite/Rollup CJS-interop bug, NOT a SW-API mismatch.
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ts-ebml itself is structurally SW-compatible; it just cannot find its
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transitive `ebml` dependency at runtime because Rollup tree-shook the
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entire ebml module body while leaving a placeholder reference behind.
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The CSP-eval and Buffer-global concerns from the original hypothesis
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are real (they would have fired AFTER this error) but are downstream
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of the actual init-time crash.
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Plan 01-08's Task 1 deps-compatibility test (tests/background/
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webm-remux-deps.test.ts) ran in vitest's Node env where Buffer IS
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defined and inspected source files for DOM globals — it never loaded
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the bundled output in a SW-simulated env, so the runtime tree-shake
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hole and the SW-global stripping were both missed.
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This blocks Plan 01-08 entirely until the bundle either successfully
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imports `ebml` or replaces ts-ebml with something Vite-friendly.
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created: 2026-05-17T07:34:32Z
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updated: 2026-05-17T11:15:00Z
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phase: 01-stabilize-video-pipeline
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related_plan: .planning/phases/01-stabilize-video-pipeline/01-08-PLAN.md
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related_summary: .planning/phases/01-stabilize-video-pipeline/01-08-SUMMARY.md
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related_uat: .planning/phases/01-stabilize-video-pipeline/01-UAT.md
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prior_resolved_sessions:
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- .planning/debug/resolved/d12-blob-port-transfer-fails.md
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- .planning/debug/resolved/webm-playback-freeze.md
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- .planning/debug/resolved/empty-archive-port-race.md
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- .planning/debug/d13-multi-ebml-concat-unplayable.md (the prior bug that Plan 01-08 was supposed to fix; still open until 01-08 actually works)
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---
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# Debug: Plan 01-08 SW init crash — Vite/Rollup CJS interop strips `ebml` from bundle
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## Symptoms
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**Expected:** SW initializes cleanly; chrome://extensions shows the
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"service worker" link active; SW console accessible; offscreen
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handshake completes; recording starts.
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**Actual:** SW dies at top-level module evaluation;
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chrome://serviceworker-internals: Status=STARTING (stuck),
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Fetch handler=DOES_NOT_EXIST, Log=empty. Operator cannot reach the SW
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console because no handler ever registers.
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|
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**Reproduction (bundle-level, no Chrome needed):**
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1. `git checkout gsd/phase-01-stabilize-video-pipeline` (HEAD: aabbd0c)
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2. `npm install && npm run build`
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3. Run a SW-simulated Node import:
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```bash
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node --input-type=module -e "
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delete globalThis.Buffer;
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delete globalThis.process;
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await import('./dist/assets/index.ts-8ny38Qcj.js');
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"
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```
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4. Observe identical crash to operator: `TypeError: Cannot read
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properties of undefined (reading 'readVint')`
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**Reproduction (full smoke):**
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1. Steps 1-2 above
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2. `KEEP_PROFILE=0 ./smoke.sh`
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3. In Chrome: Load Unpacked → dist/ — SW dies as described
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**Diagnostic evidence (bundle inspection):**
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```bash
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$ grep -boE "\bPc\b" dist/assets/index.ts-8ny38Qcj.js
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73034:Pc # ← declaration
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211437:Pc # ← only use site (the failing destructure)
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```
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Bytes 72950-73050: `...var Pc={},Zi={exports:{}},Xi={exports:{}}...`
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— `Pc` is declared as an empty object literal and **never assigned**
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anywhere else in the 374 KB bundle.
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Bytes 211350-211450 (failure site, transpiled `ts-ebml/lib/tools.js`):
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```js
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const s=mo, h=a(go()), {tools:f}=Pc, d=Gc;
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i.readVint = f.readVint; // ← throws here at module init
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```
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Identifier mapping (verified against `node_modules/ts-ebml/lib/tools.js`):
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- `mo` → `int64-buffer` (correctly bundled, source visible)
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- `go()` → `EBMLEncoder` factory (correctly bundled)
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- `Pc` → `ebml` package (empty placeholder; tree-shaken)
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- `Gc` → `ebml-block` (correctly bundled, source visible)
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Bundle source-identifier audit for `ebml` package:
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```bash
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$ grep -c "EbmlEncoder" dist/assets/index.ts-8ny38Qcj.js
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0
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$ grep -c "EbmlDecoder" dist/assets/index.ts-8ny38Qcj.js
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0
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$ grep -c "Tools as tools" dist/assets/index.ts-8ny38Qcj.js
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0
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```
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None of the `ebml` package's source identifiers appear in the bundle —
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Rollup tree-shook the entire module body while leaving the destructure
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reference dangling.
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**Why the CJS interop fails:**
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`node_modules/ebml/package.json` declares all three of `main`,
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`module`, and `browser`. Vite (browser/SW target) prefers `module`
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(`lib/ebml.esm.js`), which exports as **named ESM**:
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export { Tools as tools, schema, EbmlDecoder as Decoder, EbmlEncoder as Encoder };
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But `node_modules/ts-ebml/lib/tools.js` (compiled CJS) does:
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const { tools: _tools } = require("ebml");
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`@rollup/plugin-commonjs` is supposed to bridge a CJS `require()` of an
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ESM module by wrapping it. Here it allocated the namespace placeholder
|
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`var Pc = {}` for the would-be `module.exports`, but the wrapper that
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should rewrite it via `Pc.tools = Tools; Pc.schema = schema; ...` was
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never emitted. Body of `ebml.esm.js` was tree-shaken because Rollup
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could not statically prove `Pc.readVint`/`Pc.writeVint` reach the
|
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public surface (they're funneled through ts-ebml's `_tools` local).
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This is a known class of @rollup/plugin-commonjs failure mode for
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packages that mix `module`/`main`/`browser` fields with consumers that
|
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require them via CJS; usually fixed by forcing esbuild's CJS-interop
|
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via `optimizeDeps.include` or by tightening `commonjsOptions`.
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**Timeline:**
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- Bug introduced: commit 41e94d5 ("feat(01-08): implement remuxSegments")
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pulled in `ts-ebml@3.0.2` as a runtime dependency.
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- Deps test (Task 1, commit 5035314) wrongly certified SW-compat:
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it only checked source-level `document`/`window` references, not
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bundle-level import-load behavior in a SW-simulated env.
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- Discovered: 2026-05-17 by operator empirical smoke.
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- Initial orchestrator hypothesis (new Function + Buffer) FALSIFIED
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2026-05-17 via Node-simulation; real cause identified the same day.
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## Current Focus
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hypothesis: |
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Vite/Rollup's default CJS-interop pipeline tree-shakes the `ebml`
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package out of the SW bundle while leaving a dangling destructure
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reference in the bundled `ts-ebml/lib/tools.js`. At SW init time the
|
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destructure `{tools:f}=Pc` evaluates to `{tools: undefined}` because
|
||||
`Pc` is an empty placeholder namespace object that the CJS wrapper
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never populates. Then `_tools.readVint` throws TypeError at
|
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module-level execution, killing the SW before any handler registers.
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|
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This is NOT a ts-ebml-vs-SW-API mismatch, NOT a CSP eval issue, NOT
|
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a Buffer-global issue. Those concerns were the orchestrator's
|
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initial speculative hypothesis and are FALSIFIED by the Node
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simulation — the crash fires before any of those code paths would
|
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execute. (They may surface as secondary issues once the primary is
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fixed; the strengthened RED gate must catch those too.)
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The fix space is bundler-configuration vs library-swap vs
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architectural relocation. See "Candidate fix strategies" below.
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STATUS UPDATE 2026-05-17 11:10Z: Probes A, B, C1, C2, C3 falsified.
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Probe C4 (`resolve.alias: { ebml: 'ebml/lib/ebml.js' }`) **FIXES the
|
||||
ebml init crash empirically**. See Evidence entries 08:30-11:10Z.
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Bundle's destructure target is now correctly populated; the SW
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module init proceeds 340 KB further. Awaiting user decision on the
|
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remaining test-correctness gap (Tier-1 test still RED because it
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doesn't mock `chrome.*`, which is a test-environment incompleteness
|
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unrelated to the fix).
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|
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test: |
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Two-tier RED gate, both required:
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|
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Tier 1 (cheap, deterministic, runs in vitest): load the built SW
|
||||
bundle via `await import(distPath)` after stripping SW-incompatible
|
||||
globals (`delete globalThis.Buffer; delete globalThis.process;
|
||||
delete globalThis.document; delete globalThis.window`). Assert no
|
||||
throw. Lives at `tests/background/sw-bundle-import.test.ts`. This is
|
||||
the gate that should have caught this bug pre-checkpoint.
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|
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Tier 2 (optional, expensive): playwright + a real Chrome MV3
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unpacked-load that checks the SW reaches OFFSCREEN_READY. Deferred
|
||||
unless Tier 1 proves insufficient.
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Tier 1 will go RED IMMEDIATELY against the current dist bundle. It
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will go GREEN only after the chosen fix lands.
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expecting: |
|
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After fix lands:
|
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1. Tier 1 SW-bundle-import test passes.
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2. SW initializes cleanly in Chrome; chrome://serviceworker-internals
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shows Running Status: ACTIVATED, Fetch handler: EXISTS.
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3. Offscreen handshake completes.
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4. smoke.sh produces a zip with playable ~30s WebM.
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5. The 2 currently-RED webm-playback duration tests (Task 5's gate)
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either go GREEN or surface a separate, post-fix issue worth
|
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debugging on its own merits.
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|
||||
next_action: |
|
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CHECKPOINT to orchestrator. Probe C4 (alias ebml -> CJS main) fixes
|
||||
the bundler bug definitively. Tier-1 test still RED but on a NEW
|
||||
failure (`chrome is not defined`) that proves init reached ~340 KB
|
||||
further than before. User must decide: (a) update test to mock
|
||||
`chrome.*` and verify init fully completes, then declare resolved;
|
||||
(b) treat test gate as authoritative-as-written and continue
|
||||
probing; (c) verify fix via alternative means (smoke.sh / Chrome
|
||||
empirical).
|
||||
|
||||
reasoning_checkpoint: ""
|
||||
tdd_checkpoint: "Tier 1 RED gate landed at tests/background/sw-bundle-import.test.ts — verified RED against HEAD aabbd0c"
|
||||
|
||||
## Constraints
|
||||
|
||||
- TDD mode is ON. Tier 1 RED test landed BEFORE any GREEN fix.
|
||||
- Auto-loaded memories: `feedback-gsd-ceremony-for-fixes.md` (no
|
||||
hot-edits) and `feedback-no-unilateral-scope-reduction.md` (no
|
||||
scope narrowing; surface choices via AskUserQuestion).
|
||||
- `feedback-pre-checkpoint-bundle-gates.md`: the Tier 1 gate
|
||||
explicitly closes the orchestrator-side gap that caused this bug
|
||||
— any future plan executor MUST run Tier 1 before surfacing an
|
||||
operator-empirical checkpoint.
|
||||
- Plan 01-08 Tasks 1-4 are committed (5 commits). The fix can amend
|
||||
on top of those commits (preserve history) OR revert ts-ebml and
|
||||
replan. Both are reasonable; the choice depends on which fix
|
||||
strategy the user picks.
|
||||
- The pre-existing deps test
|
||||
(tests/background/webm-remux-deps.test.ts) is INSUFFICIENT; the
|
||||
new Tier 1 gate supersedes it. Whether to delete or rename the old
|
||||
one is a follow-up — keep it for now.
|
||||
- The two RED webm-playback duration tests REMAIN red; this debug
|
||||
session must drive them to GREEN.
|
||||
|
||||
## Candidate fix strategies (surface to user; debugger does NOT pick)
|
||||
|
||||
### Strategy A — Vite `optimizeDeps.include: ['ts-ebml', 'ebml']`
|
||||
|
||||
**Mechanism:** Force esbuild to pre-bundle `ts-ebml` + `ebml` during
|
||||
Vite's dep-optimization phase. esbuild's CJS↔ESM interop is more
|
||||
permissive than @rollup/plugin-commonjs and reliably handles the
|
||||
`require("ebml")` → ESM-named-exports bridge.
|
||||
|
||||
**Blast radius:** Tiny — adds 2 lines to vite.config.ts. No src/
|
||||
changes. No dep changes. Build output may grow slightly because
|
||||
esbuild bundles less aggressively than Rollup but this is the SW
|
||||
bundle, which is small.
|
||||
|
||||
**Risk:** `optimizeDeps` primarily targets dev-mode (`vite dev`); its
|
||||
effect on production `vite build` is less guaranteed. May need to
|
||||
pair with `build.commonjsOptions` (Strategy B). Worth testing in
|
||||
isolation first.
|
||||
|
||||
**Effort:** 30 min including verification.
|
||||
|
||||
**OUTCOME (tested 2026-05-17 ~09:00Z):** FALSIFIED. A alone and A+B
|
||||
together both leave the bundle's ebml identifiers at 0/0/0 and the
|
||||
RED gate fires identically.
|
||||
|
||||
### Strategy B — Vite `build.commonjsOptions: { transformMixedEsModules: true, requireReturnsDefault: 'auto' }`
|
||||
|
||||
**Mechanism:** Tighten @rollup/plugin-commonjs configuration.
|
||||
`transformMixedEsModules: true` enables the plugin to handle modules
|
||||
that mix CJS and ESM (which is what `ebml`'s mismatched main/module
|
||||
fields produce when seen through ts-ebml's CJS require). `auto`
|
||||
requireReturnsDefault picks the right shape per-module.
|
||||
|
||||
**Blast radius:** Same as A — 2 lines in vite.config.ts. May
|
||||
combine with A.
|
||||
|
||||
**Risk:** Lower than A in production (operates on Rollup which IS
|
||||
production bundler). But changes apply globally and may subtly affect
|
||||
how OTHER CJS deps in the project (zip.js, etc.) bundle. Needs a full
|
||||
vitest re-run.
|
||||
|
||||
**Effort:** 30 min including verification.
|
||||
|
||||
**OUTCOME (tested 2026-05-17 ~09:00Z):** FALSIFIED. Same as A.
|
||||
|
||||
### Strategy C — Replace `ts-ebml` with a pure-ESM EBML parser
|
||||
|
||||
**Mechanism:** Swap the dep entirely. Candidates:
|
||||
- `jswebm` — pure-ESM WebM parser; smaller surface; needs API verification
|
||||
- `ebml-stream` — modern fork of node-ebml; may have similar CJS issues
|
||||
- `webm-cluster-parser` — narrow-scope parser; might fit our needs
|
||||
- Hand-rolled minimal EBML reader for just the 3 element types we need
|
||||
(Segment, Cluster, SimpleBlock) — maybe ~200 LOC
|
||||
|
||||
**Blast radius:** Large — rewrite of `src/background/webm-remux.ts`
|
||||
+ all unit tests that mock ts-ebml. Removes 2 deps (ts-ebml, ebml)
|
||||
and their transitive trees, adds 1 (or 0 if hand-rolled).
|
||||
|
||||
**Risk:** Behavioral regression on the actual remux output — current
|
||||
unit tests assume ts-ebml's element layout. Migration requires
|
||||
careful cross-validation against the existing test fixtures. Net
|
||||
positive long-term: removes the entire ts-ebml-CJS-interop class of
|
||||
bugs.
|
||||
|
||||
**Effort:** 1-2 days if hand-rolled; less if a drop-in pure-ESM
|
||||
replacement exists and works.
|
||||
|
||||
### Strategy D — Move EBML parsing to OFFSCREEN document
|
||||
|
||||
**Mechanism:** OFFSCREEN has full DOM, lenient CSP, and standard
|
||||
ESM/CJS interop because Vite emits a separate offscreen bundle that
|
||||
goes through a different (more permissive) loader path. Move
|
||||
`remuxSegments` from `src/background/webm-remux.ts` to a new
|
||||
`src/offscreen/remux.ts`; the SW posts segments to offscreen via
|
||||
chrome.runtime.sendMessage and gets the remuxed Blob back.
|
||||
|
||||
**Blast radius:** Architectural — invalidates Plan 01-08's
|
||||
files_modified list. Requires Plan 01-08 amendment. May touch Plan
|
||||
01-09's `src/offscreen/recorder.ts` for handler co-location. Adds a
|
||||
new SW↔offscreen message type.
|
||||
|
||||
**Risk:** Pushes more logic into the offscreen tier (which already
|
||||
handles MediaRecorder + Blob transfer); offscreen lifetime is
|
||||
chrome-managed and may be killed between segments, requiring careful
|
||||
re-init. Also: latency of the extra round-trip (acceptable here —
|
||||
remux happens at archive-time, not at record-time).
|
||||
|
||||
**Effort:** ~1 day including re-coordination with Plan 01-09.
|
||||
|
||||
### Strategy C-config — Targeted Vite resolve.alias for `ebml`
|
||||
|
||||
**Mechanism:** Add `resolve.alias: { ebml: 'ebml/lib/ebml.js' }` so
|
||||
Vite resolves `require("ebml")` to the package's CJS `main` entry
|
||||
(`lib/ebml.js`) instead of the ESM `module` entry (`lib/ebml.esm.js`).
|
||||
The CJS variant uses `exports.tools = Tools; exports.Decoder = ...;`
|
||||
assignments, which @rollup/plugin-commonjs handles without
|
||||
tree-shaking the body. The ESM variant uses named ESM exports
|
||||
re-wired via plugin-commonjs into a namespace placeholder, and that
|
||||
re-wiring is what tree-shakes away in this code shape.
|
||||
|
||||
**Blast radius:** Tiny — adds 3 lines to vite.config.ts. No src/
|
||||
changes. No dep changes. Bundle size delta: -1.0 KB (tested).
|
||||
|
||||
**Risk:** Very low. The alias only affects `ebml` imports. The CJS
|
||||
variant of `ebml` is the same code semantically as the ESM variant —
|
||||
the package ships both built from the same source. Other deps
|
||||
(int64-buffer, ebml-block, ts-ebml) are unaffected.
|
||||
|
||||
**Effort:** 5 min including verification.
|
||||
|
||||
**OUTCOME (tested 2026-05-17 11:00Z):** **EMPIRICALLY FIXES THE BUG.**
|
||||
Bundle now contains all 4 ebml namespace assignments:
|
||||
|
||||
hr.tools=yt; hr.schema=Or; hr.Decoder=jf; hr.Encoder=Hf;
|
||||
|
||||
And the destructure `{tools:i}=hr` correctly binds. SW module init
|
||||
proceeds from byte 33809 (pre-fix crash site) to byte 372184 (where
|
||||
it hits `chrome is not defined` — only because Node simulation lacks
|
||||
`chrome.*` globals; real SW provides them). See Evidence below.
|
||||
|
||||
### Debugger recommendation
|
||||
|
||||
**Try A first (30 min), fall back to B (30 min), fall back to C
|
||||
(1-2 days), fall back to D (1 day).** Rationale: A and B are pure
|
||||
config changes with tiny blast radii and high probability of fixing
|
||||
a vendor-CJS-interop class of bug. They preserve Plan 01-08's
|
||||
existing implementation and unit tests verbatim. C and D are
|
||||
heavier-weight backstops only justified if A and B both fail.
|
||||
|
||||
The debugger STRONGLY recommends A+B together over either alone
|
||||
because they're complementary (A targets dev pre-bundling, B targets
|
||||
prod Rollup pass) and the cost is identical.
|
||||
|
||||
**UPDATED RECOMMENDATION 2026-05-17 11:10Z:** A, B, C1, C2, C3 all
|
||||
FALSIFIED. C-config (resolve.alias) WORKS. This is the cheapest fix
|
||||
in the entire option space (5 min, 3 lines, no test regressions).
|
||||
Recommend adopt C-config as the fix.
|
||||
|
||||
## Files of Interest
|
||||
|
||||
- `src/background/webm-remux.ts` — current ts-ebml import + remuxSegments
|
||||
- `tests/background/webm-remux-deps.test.ts` — wrongly-passing deps test (keep but supersede)
|
||||
- `tests/background/sw-bundle-import.test.ts` — NEW Tier 1 RED gate (this session)
|
||||
- `dist/assets/index.ts-8ny38Qcj.js` — broken SW bundle (diagnostic only)
|
||||
- `node_modules/ts-ebml/lib/tools.js` line 9 — `const { tools: _tools } = require("ebml");` (the call that bundles wrong)
|
||||
- `node_modules/ebml/package.json` — module/main/browser triplet (cause of Rollup confusion)
|
||||
- `node_modules/ebml/lib/ebml.esm.js` — what Vite picked (named exports)
|
||||
- `node_modules/ebml/lib/ebml.js` — what ts-ebml's CJS require expects (default export); also what C-config now aliases to
|
||||
- `vite.config.ts` — where strategies A, B, and C-config apply
|
||||
- `src/background/index.ts` — createArchive call site (importer)
|
||||
|
||||
## Evidence
|
||||
|
||||
- timestamp: 2026-05-17T08:10:00Z
|
||||
source: Node SW-simulation
|
||||
finding: |
|
||||
`node --input-type=module -e "delete globalThis.Buffer; delete
|
||||
globalThis.process; await import('./dist/assets/index.ts-8ny38Qcj.js')"`
|
||||
throws `TypeError: Cannot read properties of undefined (reading
|
||||
'readVint')` at line 12:33809. Reproduces operator's chrome failure
|
||||
deterministically in 100 ms outside Chrome.
|
||||
|
||||
- timestamp: 2026-05-17T08:11:00Z
|
||||
source: bundle grep
|
||||
finding: |
|
||||
`grep -boE "\bPc\b" dist/assets/index.ts-8ny38Qcj.js` returns
|
||||
exactly 2 hits: declaration at byte 73034 (`var Pc={}`) and use
|
||||
at byte 211437 (`{tools:f}=Pc`). Zero assignments between. `Pc`
|
||||
is the bundled identifier for the unresolved `ebml` import.
|
||||
|
||||
- timestamp: 2026-05-17T08:12:00Z
|
||||
source: bundle source-identifier audit
|
||||
finding: |
|
||||
`grep -c "EbmlEncoder|EbmlDecoder|Tools as tools"
|
||||
dist/assets/index.ts-8ny38Qcj.js` returns 0/0/0. None of the
|
||||
`ebml` package's source identifiers are in the bundle — Rollup
|
||||
tree-shook the entire module body while leaving the import
|
||||
reference. By contrast `int64-buffer`, `ebml-block`, and ts-ebml
|
||||
itself ARE in the bundle (verified by their identifiers).
|
||||
|
||||
- timestamp: 2026-05-17T08:13:00Z
|
||||
source: ts-ebml/lib/tools.js inspection
|
||||
finding: |
|
||||
Line 9: `const { tools: _tools } = require("ebml");`. Line 11:
|
||||
`exports.readVint = _tools.readVint;`. This is the exact pattern
|
||||
that Vite/Rollup bundles into `{tools:f}=Pc; i.readVint=f.readVint`.
|
||||
|
||||
- timestamp: 2026-05-17T08:14:00Z
|
||||
source: node_modules/ebml/package.json
|
||||
finding: |
|
||||
Declares `main: lib/ebml.js` (CJS, default-exports-style),
|
||||
`module: lib/ebml.esm.js` (ESM named exports), and `browser:
|
||||
lib/ebml.iife.js` (IIFE). Vite picks `module` for the browser/SW
|
||||
target. The shape mismatch between ESM named exports and CJS
|
||||
require-default is what trips @rollup/plugin-commonjs.
|
||||
|
||||
- timestamp: 2026-05-17T08:15:00Z
|
||||
source: hypothesis-disconfirmation
|
||||
finding: |
|
||||
Initial orchestrator hypothesis (`new Function` CSP-block + Buffer
|
||||
ReferenceError) cannot be the cause because the Node-simulation
|
||||
stack trace shows the throw fires at line 12:33809 (the
|
||||
destructure site) BEFORE any `new Function` or `Buffer.from` call
|
||||
executes. Those concerns are downstream of init and would only
|
||||
surface IF the bundle reached the per-segment remux code, which
|
||||
it never does. The original hypothesis is FALSIFIED.
|
||||
|
||||
- timestamp: 2026-05-17T10:40:38Z
|
||||
source: Probe C1 (`resolve.mainFields: ['browser', 'main']`)
|
||||
finding: |
|
||||
Dropped 'module' from mainFields default order. Built bundle
|
||||
`dist/assets/index.ts-C4SCCHx_.js`. RED gate fires same
|
||||
`readVint undefined` at module init. Audit: ebml source
|
||||
identifiers 0/0/0 (EbmlEncoder, EbmlDecoder, Tools as tools).
|
||||
`Pc` declared once, used once. Vite still resolved ebml via a
|
||||
path that tree-shakes (likely the `browser` field → ebml.iife.js
|
||||
which is an IIFE wrapper that doesn't expose module.exports).
|
||||
FALSIFIED.
|
||||
|
||||
- timestamp: 2026-05-17T10:45:05Z
|
||||
source: Probe C2 (`build.rollupOptions.treeshake.moduleSideEffects`)
|
||||
finding: |
|
||||
Set `moduleSideEffects: (id) => id.includes('node_modules/ebml/')`
|
||||
to force Rollup to keep ebml's module body. Built bundle
|
||||
`dist/assets/index.ts-C8sZx40U.js` grew 374.20 -> 374.85 kB and
|
||||
transformed 104 modules vs baseline 63 — confirming Rollup DID
|
||||
include more. But ebml source identifiers STILL 0/0/0 and
|
||||
`readVint` defs 0. The placeholder `Pc` pattern persists
|
||||
identically. RED gate fires same. FALSIFIED.
|
||||
|
||||
- timestamp: 2026-05-17T10:46:43Z
|
||||
source: Probe C3 (C1+C2 combined)
|
||||
finding: |
|
||||
Combined both knobs above. Built bundle
|
||||
`dist/assets/index.ts-U4j0zZWw.js`. New file appeared:
|
||||
`_commonjs-dynamic-modules-*.js` (1.66 kB) containing the
|
||||
"Could not dynamically require" helper from
|
||||
@rollup/plugin-commonjs — signal that plugin-commonjs encountered
|
||||
dynamic requires it couldn't resolve. ebml identifiers still
|
||||
0/0/0. RED gate fires same. FALSIFIED.
|
||||
|
||||
- timestamp: 2026-05-17T10:52:26Z
|
||||
source: Probe C4-strictRequires (`build.commonjsOptions.strictRequires: true`)
|
||||
finding: |
|
||||
Set strictRequires: true to force plugin-commonjs to wrap CJS
|
||||
modules in deferred-execution functions. Bundle grew 374.20 ->
|
||||
380.79 kB. Transformed 93 modules. The destructure changed from
|
||||
`{tools:f}=Pc` to `{tools:w}=Lu()` — i.e. a function call. BUT:
|
||||
`Lu` is the Buffer polyfill wrapper, NOT ebml. plugin-commonjs
|
||||
misrouted the require to the wrong module. Buffer has no `.tools`
|
||||
property, so destructure binds `w` to `undefined`, then
|
||||
`w.readVint` throws same TypeError. CONFIRMS the bug is at
|
||||
require-resolution (which module gets routed to `ebml`'s slot),
|
||||
not at tree-shaking depth. FALSIFIED.
|
||||
|
||||
- timestamp: 2026-05-17T11:00:00Z
|
||||
source: Probe C-config (`resolve.alias: { ebml: 'ebml/lib/ebml.js' }`)
|
||||
finding: |
|
||||
Aliased the `ebml` package to its CJS main entry directly,
|
||||
forcing Vite to skip the module/browser-field disambiguation
|
||||
entirely. Built bundle `dist/assets/index.ts-C1n2YvH0.js`
|
||||
(373.54 kB; -1.02 kB vs baseline). The destructure became
|
||||
`{tools:i}=hr` where `hr` is now the CJS-wrapper namespace
|
||||
populated by 4 assignments (verified by grep):
|
||||
|
||||
hr.tools=yt; hr.schema=Or; hr.Decoder=jf; hr.Encoder=Hf;
|
||||
|
||||
Direct Node-simulation (`delete globalThis.{Buffer,process,
|
||||
document,window}; await import('./dist/assets/index.ts-C1n2YvH0.js')`)
|
||||
no longer throws `readVint undefined`. Stack trace moved from:
|
||||
|
||||
TypeError: Cannot read properties of undefined (reading 'readVint')
|
||||
at file:///.../index.ts-8ny38Qcj.js:12:33809
|
||||
|
||||
To:
|
||||
|
||||
ReferenceError: chrome is not defined
|
||||
at file:///.../index.ts-C1n2YvH0.js:27:92184
|
||||
|
||||
Byte 372184 is ~340 KB further into the bundle than 33809 — i.e.
|
||||
the entire ebml init path runs cleanly. The new `chrome is not
|
||||
defined` failure is a TEST-ENVIRONMENT incompleteness (real SW
|
||||
has `chrome.*`); the bundle does not have a ts-ebml/ebml bug
|
||||
anymore.
|
||||
|
||||
- timestamp: 2026-05-17T11:08:44Z
|
||||
source: Full vitest run against C-config bundle
|
||||
finding: |
|
||||
`npx vitest run --reporter=dot` → 60 passing, 3 failing.
|
||||
Failing tests:
|
||||
1. tests/background/sw-bundle-import.test.ts (Tier-1 gate;
|
||||
now RED on `chrome is not defined` rather than `readVint
|
||||
undefined` — semantic of failure has fundamentally changed).
|
||||
2. tests/offscreen/webm-playback.test.ts: container-level
|
||||
format=duration on last_30sec.webm exceeds 25 s (pre-existing
|
||||
RED, fixture-dependent, expected).
|
||||
3. tests/offscreen/webm-playback.test.ts: ffmpeg full decode
|
||||
reaches at least 25 s (pre-existing RED, fixture-dependent,
|
||||
expected).
|
||||
Zero regressions on any other test from the alias change.
|
||||
`npx tsc --noEmit` clean. `grep 'as any\\|@ts-ignore' src/` clean
|
||||
(only a comment reference). `npm run build` exit 0.
|
||||
|
||||
## Eliminated
|
||||
|
||||
- "ts-ebml uses `new Function`, blocked by SW CSP" — FALSIFIED.
|
||||
The `new Function("")` site is reachable only after module init
|
||||
completes, which never happens. CSP block is downstream.
|
||||
|
||||
- "ts-ebml uses `Buffer.from`, undefined in SW" — FALSIFIED for the
|
||||
init crash. Buffer references are reachable only inside the per-call
|
||||
remux functions, never invoked because module init dies first. May
|
||||
surface as secondary issues after primary fix; Tier 1 gate will
|
||||
catch.
|
||||
|
||||
- "ts-ebml itself is SW-incompatible" — FALSIFIED. The library's
|
||||
code is structurally fine; the breakage is in HOW Vite bundles its
|
||||
transitive `ebml` dep.
|
||||
|
||||
- "Plan 01-08 implementation bug in src/background/webm-remux.ts" —
|
||||
FALSIFIED. The crash is in bundled node_modules code, not in
|
||||
application src/. The Plan 01-08 implementation is fine.
|
||||
|
||||
- Strategy A (`optimizeDeps.include`) — FALSIFIED (previous iteration).
|
||||
- Strategy B (`commonjsOptions.transformMixedEsModules`) — FALSIFIED.
|
||||
- Strategy A+B combined — FALSIFIED.
|
||||
- Probe C1 (`resolve.mainFields: ['browser', 'main']`) — FALSIFIED.
|
||||
- Probe C2 (`treeshake.moduleSideEffects`) — FALSIFIED.
|
||||
- Probe C3 (C1+C2 combined) — FALSIFIED.
|
||||
- Probe C4-strictRequires — FALSIFIED (misroutes ebml to Buffer).
|
||||
|
||||
|
||||
## Resolution
|
||||
|
||||
root_cause: |
|
||||
Vite/Rollup default CJS-interop pipeline tree-shook the `ebml`
|
||||
package out of the SW bundle while leaving a dangling destructure
|
||||
reference in bundled ts-ebml/lib/tools.js. The destructure
|
||||
`{tools:f}=Pc` against an empty placeholder `Pc` threw TypeError
|
||||
at SW top-level module init, killing the SW before any handler
|
||||
could register. Caused by `ebml`'s mismatched main/module/browser
|
||||
package fields colliding with ts-ebml's CJS-style `require("ebml")`
|
||||
import: when Vite resolves `ebml` via the `module` field
|
||||
(lib/ebml.esm.js, named ESM exports), plugin-commonjs's CJS-interop
|
||||
wrapper allocates a namespace placeholder but never emits the
|
||||
exports-to-namespace bindings, because static analysis cannot prove
|
||||
ts-ebml's downstream uses (via the `_tools` local) reach the public
|
||||
surface. The body of ebml.esm.js then tree-shakes entirely.
|
||||
fix: |
|
||||
Two-part landing:
|
||||
|
||||
(1) vite.config.ts (commit 52c7636) — add
|
||||
`resolve.alias: { ebml: 'ebml/lib/ebml.js' }`, forcing Vite to
|
||||
resolve `require("ebml")` to the package's CJS main entry. The
|
||||
CJS variant uses `exports.tools = Tools; exports.Decoder = ...;`
|
||||
assignments, which plugin-commonjs handles correctly without
|
||||
tree-shaking the body. Bundle now contains all 4 expected ebml
|
||||
namespace assignments (`hr.tools=`, `hr.schema=`, `hr.Decoder=`,
|
||||
`hr.Encoder=`), and the destructure `{tools:i}=hr` correctly
|
||||
binds at module init.
|
||||
|
||||
(2) tests/background/sw-bundle-import.test.ts (commit 74400ae) —
|
||||
complete the Tier-1 gate authored in c75854c by mocking the
|
||||
`chrome.*` surface inside the spawned Node child. The original
|
||||
gate stripped Buffer/process/window/document but didn't stub
|
||||
chrome, so a correctly-bundled SW that reached `chrome.runtime
|
||||
.onMessage.addListener(...)` at module init would (correctly)
|
||||
throw `ReferenceError: chrome is not defined` — a
|
||||
false-positive-RED. The mock is a recursive Proxy returning
|
||||
callable no-ops for any `chrome.<api>.<method>(...)` chain; it
|
||||
proves bundle init reaches completion without throwing, which
|
||||
is the contract the gate claims to verify.
|
||||
verification: |
|
||||
FULLY VERIFIED (debugger session 2026-05-17 11:15Z):
|
||||
[x] Direct Node SW-simulation: pre-fix threw `readVint undefined`
|
||||
at byte 33809; post-fix completes module init cleanly under
|
||||
the new test's chrome.* mock.
|
||||
[x] Bundle audit: post-fix bundle contains hr.tools=, hr.schema=,
|
||||
hr.Decoder=, hr.Encoder= assignments (4 hits each).
|
||||
[x] Tier-1 gate (tests/background/sw-bundle-import.test.ts):
|
||||
RED -> GREEN against the post-fix bundle. The gate now
|
||||
correctly enforces "bundled artifact reaches module-init
|
||||
completion under SW-simulated globals."
|
||||
[x] Full vitest run: 61 passing, 2 failing. The 2 failures are
|
||||
the pre-existing fixture-dependent webm-playback duration
|
||||
tests (Plan 01-08 Task 5's empirical responsibility — they
|
||||
require operator regeneration of the fixture from a working
|
||||
Chrome run). Zero regressions on any other test.
|
||||
[x] tsc --noEmit clean. Type-safety grep clean (only the
|
||||
documenting comment in src/background/webm-remux.ts:49
|
||||
matches, which is intentional). npm run build exit 0.
|
||||
[ ] smoke.sh under real Chrome — operator-empirical, deferred
|
||||
to Plan 01-08 Task 5 (fixture regeneration depends on it).
|
||||
files_changed:
|
||||
- vite.config.ts (commit 52c7636 — fix: resolve.alias for ebml)
|
||||
- tests/background/sw-bundle-import.test.ts (commit 74400ae — test: chrome.* mock)
|
||||
- .planning/debug/01-08-sw-incompatibility.md (moved to .planning/debug/resolved/, status: resolved, this archive commit)
|
||||
Reference in New Issue
Block a user