name: spike-findings-angular-typechecker description: Implementation blueprint from spike experiments. Requirements, proven patterns, and verified knowledge for building angular-typechecker -- the v0.1.2 Storybook input-set-membership boundary (Phase 16 gate = GO, branch 4a), the shipped v0.1.0 reference-walk engine, Vite/Analog Storybook query-import guidance (the `vite/client` recipe + optional advisory), and the v0.2.1 Angular CLI builder GATE A' (Phase 21 = GO: the CJS->ESM `await import()` bridge survives `convertNxExecutor` + a real `ng run`). Auto-loaded during implementation work.

## Project: angular-typechecker

An Nx plugin that runs the COMPLETE Angular type-check (TypeScript + template type-check + extended NG8xxx diagnostics), no-emit, decoupled from build/test, per project. Two spike ideas are packaged here: (1) the SHIPPED v0.1.0 solution-tsconfig reference-walk engine, and (2) the v0.1.2 Storybook type-check gate -- one boundary-filter correctness fix (directory-containment -> compiler input-set membership) whose motivating case is the centralized Storybook host.

Spike sessions wrapped: 2026-07-01 (001-005), 2026-07-05 (006-008), 2026-07-07 (009-010).

## Requirements (non-negotiable design decisions)

v0.1.2 Storybook boundary (Phase 16 gate = GO)

Charter: never a silent false pass; over-report (false FAIL) is the safe direction.
Replace directory-containment with a pure keep(diagnostic, inputSet, options) -> boolean keyed on compiler input-set membership; route BOTH the walk and the direct single-leaf path through it; ZERO ngtsc/component-registry internals (structural git grep gate).
Key inputTs on the DECLARED readConfiguration(leaf).rootNames (NOT program.getRootFileNames(), which adds .ngtypecheck.ts shims -- spike 006).
External-template branch = 4a (spike 008: G1 = html, G5 = PASS): map the .html diagnostic to its owning component .ts via public ts.Diagnostic.relatedInformation; keep iff that .ts is in inputTs; default-KEEP the unmappable edge (fail-safe).
Split the suppressed counter into suppressedThirdParty + suppressedInGraph; surface both loudly in stdout AND the structured result; suppressedInGraph > 0 => non-clean coverage-incomplete.
Check the WHOLE tsconfig-declared set, never a *.stories.ts allowlist. No Storybook-specific machinery (no version gate/selector/option). @storybook/angular@10 peer incompatibility is docs-only (D4).

v0.1.0 reference-walk engine (shipped)

Union-then-single-finalize; dedupe identity = ts.sortAndDeduplicateDiagnostics; counts explicit by category; walk skips out-of-project refs (skip-with-notice); D-03a three-way split at rootNames === 0; walk Nx inputs use the default named input; benchmark with Vitest bench.

Vite/Analog query-import guidance (v0.1.2 UAT follow-up)

The fix is CONSUMER-side: recommend "types": ["vite/client"] on the checked tsconfig (zeroes Vite ?query TS2307; radix 227 -> 0). Never auto-suppress ?query TS2307 (no-false-pass). A hand declare module '*?query' shim is a fallback but incomplete. An optional detection advisory keys on unresolved TS2307 + ?-in-specifier (builder-agnostic, verdict-neutral, self-gating). Wildcard blind spot: a ?query import of a missing base resolves through the ambient wildcard.

<findings_index>

Feature Areas

Area	Reference	Key Finding
Storybook input-set boundary (v0.1.2, Phase 17 build)	references/storybook-input-set-boundary.md	GATE = GO. Layout B type-checkable on the official stack; ship the input-set `keep()` + branch 4a (relatedInformation ownership) + split counter.
Reference-walk engine (v0.1.0, shipped foundation)	references/reference-walk-engine.md	The shipped walk the boundary builds on; its rootName-surfacing feeds the new keep-rule.
Vite/Analog query-import support (v0.1.2 follow-up)	references/vite-analog-query-imports.md	`"types": ["vite/client"]` zeroes Vite `?query` TS2307 (radix 227->0) safely; optional diagnostic-based advisory; never auto-suppress.
Angular CLI builder GATE A' (v0.2.1, Phase 21 gate)	.planning/spikes/011-builder-ng-run-esm-bridge/	GATE = GO. The shipped CJS->ESM `await import()` bridge survives `convertNxExecutor` + a real `ng run` on-stack Angular 22 (app + library, incl. the eager project-graph prelude); no `ERR_REQUIRE_ESM`, planted `TS2322` RED / clean GREEN, on-stack install needs no `--legacy-peer-deps`. Builder = `convertNxExecutor(typecheckExecutor)`; never hand-write an architect builder (D-04).

Source Files

Spike records (README + harness.mjs + forensic-log.json + fixture) are committed in-repo under .planning/spikes/NNN-*/ (not duplicated into a sources/ dir -- they are version-controlled there). Reproduction of the forced-SB10 spike (007) is documented in its README (isolated scaffold, npm install --legacy-peer-deps). </findings_index>

## Processed Spikes

001-reference-walk-aggregation
002-module-boundary-guard
003-double-compile-cost
004-d03a-surgical-split
005-coarse-single-target-caching
006-layout-b-rootnames
007-forced-sb10-compile-ng8xxx
008-external-template-attribution
009-vite-ambient-shim-resolves-query-imports
010-vite-query-detection-advisory
011-builder-ng-run-esm-bridge

Area

Reference

Key Finding

Storybook input-set boundary (v0.1.2, Phase 17 build)

references/storybook-input-set-boundary.md

GATE = GO. Layout B type-checkable on the official stack; ship the input-set keep() + branch 4a (relatedInformation ownership) + split counter.

Reference-walk engine (v0.1.0, shipped foundation)

references/reference-walk-engine.md

The shipped walk the boundary builds on; its rootName-surfacing feeds the new keep-rule.

Vite/Analog query-import support (v0.1.2 follow-up)

references/vite-analog-query-imports.md

"types": ["vite/client"] zeroes Vite ?query TS2307 (radix 227->0) safely; optional diagnostic-based advisory; never auto-suppress.

Angular CLI builder GATE A' (v0.2.1, Phase 21 gate)

.planning/spikes/011-builder-ng-run-esm-bridge/

GATE = GO. The shipped CJS->ESM await import() bridge survives convertNxExecutor + a real ng run on-stack Angular 22 (app + library, incl. the eager project-graph prelude); no ERR_REQUIRE_ESM, planted TS2322 RED / clean GREEN, on-stack install needs no --legacy-peer-deps. Builder = convertNxExecutor(typecheckExecutor); never hand-write an architect builder (D-04).