Docs cleanup

Fixes #1

initial packaging

Revamp build process and separate CLDR data

Fix bug with month and year diff calculation

…k, Rollup, esbuild, Rspack

Create `@formatjs/unplugin` as a universal build plugin powered by unplugin that provides
the same FormatJS AST transformations across all major bundlers with a single codebase.

The core `transform.ts` (451 lines) is moved from `@formatjs/vite-plugin` into this new
package. `@formatjs/vite-plugin` becomes a thin re-export from `@formatjs/unplugin/vite`
for backward compatibility.

Key changes:
- New `packages/unplugin/` with entry points for vite, webpack, rollup, esbuild, rspack
- `packages/vite-plugin/` simplified to 2-line re-export wrapper
- 51 unit tests (47 transform + 4 factory tests)
- Full documentation with usage examples for all 5 bundlers
- Added `ESNEXT_SKIP_LIB_CHECK_TSCONFIG` for packages depending on unplugin
- Added `skipLibCheck` to vitest test tsconfig for transitive type compatibility

Closes UPCOMING.md item #1 (Vite Plugin Adoption).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…k, Rollup, esbuild, Rspack

Create `@formatjs/unplugin` as a universal build plugin powered by unplugin that provides
the same FormatJS AST transformations across all major bundlers with a single codebase.

The core `transform.ts` (451 lines) is moved from `@formatjs/vite-plugin` into this new
package. `@formatjs/vite-plugin` becomes a thin re-export from `@formatjs/unplugin/vite`
for backward compatibility.

Key changes:
- New `packages/unplugin/` with entry points for vite, webpack, rollup, esbuild, rspack
- `packages/vite-plugin/` simplified to 2-line re-export wrapper
- 51 unit tests (47 transform + 4 factory tests)
- Full documentation with usage examples for all 5 bundlers
- Added `ESNEXT_SKIP_LIB_CHECK_TSCONFIG` for packages depending on unplugin
- Added `skipLibCheck` to vitest test tsconfig for transitive type compatibility

Closes UPCOMING.md item #1 (Vite Plugin Adoption).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…ollup, esbuild, Rspack (#6096)

## Summary

- Create `@formatjs/unplugin` — a universal build plugin powered by
[unplugin](https://github.com/unjs/unplugin) that provides FormatJS AST
transformations (ID generation, description removal, AST pre-parsing)
across all major bundlers with a single codebase
- `@formatjs/vite-plugin` becomes a thin 2-line re-export from
`@formatjs/unplugin/vite` for backward compatibility — zero breaking
changes for existing users
- Full documentation with usage examples for Vite, Webpack, Rollup,
esbuild, and Rspack

Closes UPCOMING.md item #1 (Vite Plugin Adoption: 689/week vs 276K for
babel-plugin).

## What changed

### New: `packages/unplugin/`
- `transform.ts` — core transform logic (moved from vite-plugin, 451
lines, unchanged)
- `index.ts` — `createUnplugin` factory with `transformInclude` +
`transform` hooks
- `vite.ts`, `webpack.ts`, `rollup.ts`, `esbuild.ts`, `rspack.ts` —
bundler entry points
- `package.json` — exports for `.`, `./vite`, `./webpack`, `./rollup`,
`./esbuild`, `./rspack`, `./transform`
- 51 unit tests (47 transform + 4 factory)

### Updated: `packages/vite-plugin/`
- `index.ts` → 2-line re-export from `@formatjs/unplugin/vite`
- `transform.ts` → deleted (moved to unplugin)
- `tests/` → deleted (moved to unplugin)
- Integration tests stay and all 10 pass

### Build system
- `tools/tsconfig.bzl` — added `ESNEXT_SKIP_LIB_CHECK_TSCONFIG`
(unplugin's types import from all bundlers)
- `tools/vitest.bzl` — added `skipLibCheck` to test tsconfig for
transitive type compatibility

### Docs
- New `docs/src/docs/tooling/unplugin.mdx` — full docs with all 5
bundler examples + migration guides
- Updated `vite-plugin.mdx` — tip recommending unplugin for new projects
- Updated `bundler-plugins.mdx` — added unplugin section with tabbed
examples
- Updated navigation tree

## Test plan

- [x] `bazel test //packages/unplugin:unit_test` — 51 tests pass
- [x] `bazel test
//packages/unplugin:unit_test_typecheck_typecheck_test` — type-check
passes
- [x] `bazel test
//packages/vite-plugin/integration-tests:integration_test` — 10
integration tests pass (backward compat)
- [x] `bazel test //docs:docs_metadata_test` — docs metadata up to date
- [x] `pnpm t` — 484/487 pass (3 pre-existing failures in
react-intl/vue-intl sandbox resolution, confirmed on clean main)
- [x] All pre-commit hooks pass (format, lint, commitlint)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>