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feat: dual ESM/CJS export maps and gating attw packaging checks - #176

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feat: dual ESM/CJS export maps and gating attw packaging checks#176
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devin/attw-exports

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@behnam-oneschema behnam-oneschema commented Aug 27, 2026

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Summary

Redesigns the published package entrypoints so @arethetypeswrong/cli passes on every package, and flips attw in check:packages from report-only to gating.

For the 5 Rollup packages (@oneschema/importer, react, vue, filefeeds, filefeeds-react):

  • Each package.json gains an explicit exports map — import./dist/module.mjs + ./dist/index.d.mts, require./dist/main.js + ./dist/index.d.cts — plus "./dist/*" (kept open deliberately: the importer's UMD bundle is consumed via CDN deep paths) and "./package.json". main/module stay for legacy resolvers; top-level types moves to the .d.cts.
  • Rollup additionally emits dist/module.mjs (true-ESM twin of module.js), and a new shared post-build step scripts/dual-types.mjs derives index.d.mts (copy) and index.d.cts from the generated index.d.ts. For packages with a default export, the .d.cts replaces export { X as default, ... } with the interop-truthful shape:
    declare const _default: { default: typeof X; /* named runtime exports */ };
    declare namespace _default { /* type-only exports, e.g. OneSchemaParams */ }
    export = _default;
    which matches exactly what the CJS bundle (exports: "named": exports.default + named + __esModule) provides — the bare require() result is a non-callable object, and the declaration says so — while the namespace merge preserves the full public type surface (type-only exports like OneSchemaParams) for CJS/node10 consumers. This clears attw's MissingExportEquals/node10/node16 findings on all four resolution modes.
  • Packaging hygiene while here: canonical repository.url, sideEffects: false, and a files allowlist (Vue was shipping its test/ pages).
  • Dependent workspaces (react, vue, filefeeds-react, angular) get a tsconfig paths entry mapping @oneschema/importer/filefeeds to the built .d.mts, so local tsc doesn't misread the new .d.cts under their legacy moduleResolution: node. The Angular spec tsconfig clears paths so Karma specs resolve the installed package (runtime + its complete .d.cts types). Vue's internal import gains a .js extension so its emitted declarations resolve under node16 ESM.

@oneschema/angular is left as-is: it's the standard ng-packagr 16 ESM-only shape, and I verified a "type": "module" post-process just trades FalseCJS for InternalResolutionError (extensionless imports in generated d.ts). Its attw run uses --profile esm-only --ignore-rules cjs-resolves-to-esm false-cjs with a comment noting a real fix needs the Angular 17+ toolchain. Verified the built Angular declarations keep bare @oneschema/importer specifiers (no deep paths leak).

Ships a patch changeset for the 5 packages — deliberately not minor: @oneschema/angular peer-depends on importer@^0.7.0 and the packages are linked, so a minor (0.8.0) would knock the peer range out-of-range and cascade the whole linked group to a 1.0.0 major.

Stacked on #175 (angular-eslint) → #174 (Yarn 4).

Test plan

  • yarn build + yarn check:packages: publint and attw green on all 6 packages (previously 5/6 had attw findings)
  • attw per-package: node10 / node16-CJS / node16-ESM / bundler all 🟢 for the 5 Rollup packages
  • Runtime sanity: require("./dist/main.js").default is a function; import x from "./dist/module.mjs" is a function
  • CJS/node10-mode consumer probe: .default(...) call + OneSchemaParams type import from @oneschema/importer both typecheck; negative probe confirms calling the bare require() result fails with TS2349 (matching runtime)
  • yarn workspace @oneschema/angular check; @oneschema/angular-example test:ci Chrome Headless 2/2 specs
  • yarn fix, workspace checks, root yarn check all pass (only preexisting filefeeds-react hooks warning)
  • yarn changeset status: all 6 publishable packages at patch, no major cascade

Link to Devin session: https://app.devin.ai/sessions/a90df1407fe74fe990a9e3f3bfa772d3
Open in Devin Desktop: https://app.devin.ai/desktop/session/a90df1407fe74fe990a9e3f3bfa772d3?variant=devin
Requested by: @behnam-oneschema

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Review Change Stack

Walkthrough

The packages now publish explicit ESM and CommonJS entrypoints with matching declarations. Rollup emits ESM bundles, dual-types.mjs creates declaration variants, and package checks fail on ATTW errors. React, Vue, and Angular configurations use updated declaration resolution.

Changes

Dual package publishing

Layer / File(s) Summary
Declaration generation and package validation
scripts/dual-types.mjs, scripts/check-packages.mjs
The build creates .d.mts and .d.cts files. ATTW failures now fail package checks, with Angular-specific options.
Core package exports and builds
packages/importer/package.json, packages/importer/rollup.config.js, packages/filefeeds/package.json, packages/filefeeds/rollup.config.js, .changeset/tidy-packages-export-maps.md
The core packages define conditional exports, publish selected files, and emit dist/module.mjs. The changeset records patch releases.
React and Vue package integration
packages/importer-react/*, packages/filefeeds-react/*, packages/importer-vue/*
React and Vue packages add dual runtime and declaration exports, ESM bundles, declaration aliases, and explicit local module extensions.
Angular resolution integration
packages/importer-angular/*
Angular separates runtime and type imports and maps @oneschema/importer to generated declarations.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🔵 Low · up to ae470

The published export map exposes an ESM dist/module.js deep path that may be interpreted as CommonJS and fail with a syntax error for Node consumers. The PR is otherwise mergeable, but the path should be removed or mapped to dist/module.mjs before merge.

Sequence Diagram(s)

sequenceDiagram
  participant PackageBuild
  participant Rollup
  participant dual-types.mjs
  participant PackageMetadata
  participant check-packages.mjs
  PackageBuild->>Rollup: Emit CommonJS and ESM bundles
  Rollup->>dual-types.mjs: Pass generated declaration file
  dual-types.mjs->>PackageMetadata: Create .d.mts and .d.cts entries
  PackageMetadata->>check-packages.mjs: Provide packaged exports
  check-packages.mjs->>PackageBuild: Run publint and ATTW checks
Loading
🚥 Pre-merge checks | ✅ 6
✅ Passed checks (6 passed)
Check name Status Explanation
Title check ✅ Passed The title uses the required Conventional Commits format and accurately describes the dual ESM/CJS export maps and gating packaging checks.
Description check ✅ Passed The description directly explains the export-map redesign, dual declarations, Rollup changes, ATTW gating, package metadata updates, and validation results.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Security Check ✅ Passed No PR-introduced security concern is evident. The changes add package metadata, ESM bundles, declaration generation, type-only imports, and stricter package checks. The new scripts use fixed commands …
Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 11 files. (12 skipped: 12 unsupported.)

Full details: Security Check

Explanation

No PR-introduced security concern is evident. The changes add package metadata, ESM bundles, declaration generation, type-only imports, and stricter package checks. The new scripts use fixed commands and fixed package paths; dual-types.mjs performs local file reads and writes only. No new network access, secret handling, dynamic code execution, dependency source, or release permissions was added. The prior dist/module.js concern is a module-resolution compatibility issue, not a security failure.

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Bundle size report

Package/file Gzip size Raw size Delta vs base (gzip)
@oneschema/angular/esm2022/base-index.mjs 553 B 700 B 0 B (0.00%)
@oneschema/angular/esm2022/oneschema-angular.mjs 421 B 512 B 0 B (0.00%)
@oneschema/angular/esm2022/src/lib/oneschema.button.mjs 1,411 B 2,578 B 0 B (0.00%)
@oneschema/angular/esm2022/src/lib/oneschema.module.mjs 1,459 B 3,363 B +23 B (1.60%)
@oneschema/angular/esm2022/src/lib/oneschema.params.mjs 603 B 848 B +21 B (3.61%)
@oneschema/angular/esm2022/src/lib/oneschema.service.mjs 1,558 B 3,207 B +7 B (0.45%)
@oneschema/angular/esm2022/src/public-api.mjs 517 B 761 B 0 B (0.00%)
@oneschema/angular/fesm2022/oneschema-angular.mjs 1,469 B 5,027 B -1 B (-0.07%)
@oneschema/filefeeds-react/main.js 7,857 B 35,825 B 0 B (0.00%)
@oneschema/filefeeds-react/module.js 7,730 B 35,424 B 0 B (0.00%)
@oneschema/filefeeds-react/module.mjs 7,731 B 35,425 B new
@oneschema/filefeeds/main.js 6,694 B 29,909 B 0 B (0.00%)
@oneschema/filefeeds/module.js 6,647 B 29,774 B 0 B (0.00%)
@oneschema/filefeeds/module.mjs 6,648 B 29,775 B new
@oneschema/filefeeds/oneschema-filefeeds-0.5.3.min.js 3,278 B 9,350 B 0 B (0.00%)
@oneschema/filefeeds/oneschema-filefeeds-0.5.latest.min.js 3,282 B 9,355 B 0 B (0.00%)
@oneschema/importer/main.js 7,763 B 35,938 B 0 B (0.00%)
@oneschema/importer/module.js 7,708 B 35,712 B 0 B (0.00%)
@oneschema/importer/module.mjs 7,709 B 35,713 B new
@oneschema/importer/oneschema-importer-0.7.5.min.js 3,758 B 11,182 B 0 B (0.00%)
@oneschema/importer/oneschema-importer-0.7.latest.min.js 3,762 B 11,187 B 0 B (0.00%)
@oneschema/react/main.js 9,363 B 41,764 B 0 B (0.00%)
@oneschema/react/module.js 9,236 B 41,258 B 0 B (0.00%)
@oneschema/react/module.mjs 9,237 B 41,259 B new
@oneschema/vue/main.js 26,040 B 110,396 B 0 B (0.00%)
@oneschema/vue/module.js 25,992 B 110,265 B 0 B (0.00%)
@oneschema/vue/module.mjs 25,992 B 110,266 B new

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Inline comments:
In `@packages/importer-angular/projects/oneschema/tsconfig.spec.json`:
- Line 6: Remove the empty paths override from the spec TypeScript configuration
so it inherits the oneschema and `@oneschema/importer` aliases from the parent
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In `@scripts/dual-types.mjs`:
- Around line 42-44: Update namedRuntimeEntries and the index.d.cts generation
around export = _default so type-only exports from
packages/importer/src/index.ts, including config.ts re-exports, remain available
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Inline comments:
In `@scripts/dual-types.mjs`:
- Around line 62-68: Update the cjsExport declaration in scripts/dual-types.mjs
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Base automatically changed from devin/angular-eslint to main August 28, 2026 00:07
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behnam-oneschema and others added 5 commits August 28, 2026 00:08
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In `@packages/importer/package.json`:
- Line 22: Update the package exports entry for "./dist/*" so it no longer
exposes the ESM dist/module.js path as CommonJS; restrict exports to format-safe
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Comment thread packages/importer/package.json
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behnam-oneschema merged commit 6c39143 into main Aug 28, 2026
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behnam-oneschema deleted the devin/attw-exports branch August 28, 2026 01:43
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