feat(loader): add webpack and Rspack loader

[dangreen]

Adds @srcset/loader: image imports become ES modules with url, src, srcSet, srcMap and placeholder exports. Name templates with content hashes, output/public path resolvers, import queries, tree-shakable codegen and the backend option; client type declarations via @srcset/loader/client. Tested against both webpack and Rspack, including tree-shaking specs.

[coveralls]

Coverage Report for CI Build 29859223679

Coverage decreased (-2.0%) to 87.201%

Details

• Coverage decreased (-2.0%) from the base build.
• Patch coverage: 13 uncovered changes across 4 files (33 of 46 lines covered, 71.74%).
• No coverage regressions found.

Uncovered Changes

File	Changed	Covered	%
packages/loader/src/paths.ts	10	5	50.0%
packages/loader/src/limit.ts	6	2	33.33%
packages/loader/src/loader.ts	18	15	83.33%
packages/loader/src/template.ts	12	11	91.67%

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	406
Covered Lines:	367
Line Coverage:	90.39%
Relevant Branches:	305
Covered Branches:	253
Branch Coverage:	82.95%
Branches in Coverage %:	Yes
Coverage Strength:	123985.59 hits per line

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💛 - Coveralls

[Copilot]

Pull request overview

This PR introduces a new @srcset/loader package that integrates the existing @srcset/* image generation pipeline with webpack and Rspack, turning image imports into tree-shakable ES modules exporting url, src, srcSet, srcMap, and placeholder, with configurable filename templating and path resolution.

Changes:

• Added packages/loader with loader implementation, option types, filename templating, path/publicPath resolvers, and shared concurrency limiting.
• Added unit tests that exercise webpack + Rspack integration, including tree-shaking behavior and placeholder export behavior.
• Added package metadata/config (package.json, tsconfigs, vitest config, oxlint config) and lockfile updates for new dependencies.

Reviewed changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Adds dependencies required by the new loader package (webpack, rspack, memfs, etc.).
packages/loader/vite.config.js	Vitest configuration for the loader package.
packages/loader/tsconfig.json	Typechecking config for loader sources/tests.
packages/loader/tsconfig.build.json	Build-time TS config for emitting dist.
packages/loader/test/loader.shim.mjs	Shim to allow bundlers to load the loader during tests.
packages/loader/test/bundler.mock.ts	Test harness to compile/bundle with webpack/rspack in-memory FS.
packages/loader/src/types.ts	Public loader option types and path resolver type.
packages/loader/src/template.ts	Filename templating ([path], [name], [postfix], [hash], etc.).
packages/loader/src/template.spec.ts	Unit tests for filename templating behavior.
packages/loader/src/paths.ts	Output/public path resolution helpers.
packages/loader/src/loader.ts	Webpack/Rspack loader entry that generates the image module + emits files.
packages/loader/src/loader.spec.ts	Integration tests for webpack/rspack behavior and tree-shaking.
packages/loader/src/limit.ts	Shared concurrency limiter for loader runs.
packages/loader/src/index.ts	Package entry exports for loader and re-exported types.
packages/loader/README.md	Usage docs and integration overview for consumers.
packages/loader/package.json	New package definition, scripts, exports, deps/peers.
packages/loader/oxlint.config.ts	Lint configuration for the new package.
packages/loader/client.d.ts	Ambient client-side typings for image imports.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

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[Copilot]

Pull request overview

Copilot reviewed 16 out of 18 changed files in this pull request and generated 2 comments.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

[Copilot]

Pull request overview

Copilot reviewed 16 out of 18 changed files in this pull request and generated 1 comment.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

[Copilot]

Pull request overview

Copilot reviewed 16 out of 18 changed files in this pull request and generated no new comments.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file