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@@ -2,13 +2,13 @@
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## Phase 1: Dev Server Turbopack Migration
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-- [ ] 1. Create empty module and Turbopack configuration foundation
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-- [ ] 1.1 (P) Create the empty module file used as the alias target for excluded server-only packages
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+- [x] 1. Create empty module and Turbopack configuration foundation
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+- [x] 1.1 (P) Create the empty module file used as the alias target for excluded server-only packages
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- Create a minimal TypeScript module at the designated location that exports an empty default and named export
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- The module satisfies any import style (default, named, namespace) so that aliased packages resolve without errors
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- _Requirements: 2.1, 2.2_
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-- [ ] 1.2 (P) Add the Turbopack configuration block to the Next.js config with resolve aliases for server-only package exclusion
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+- [x] 1.2 (P) Add the Turbopack configuration block to the Next.js config with resolve aliases for server-only package exclusion
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- Add a `turbopack` key to the Next.js config object containing `resolveAlias` entries
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- Alias `fs` to the empty module in browser context to prevent "Module not found" errors on the client
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- Alias all 7 server-only packages (`dtrace-provider`, `mongoose`, `mathjax-full`, `i18next-fs-backend`, `bunyan`, `bunyan-format`, `core-js`) to the empty module in browser context
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@@ -17,23 +17,23 @@
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- Keep the existing `webpack()` hook untouched — both configs coexist
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- _Requirements: 1.2, 2.1, 2.2, 2.3, 8.3_
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-- [ ] 1.3 Add the superjson-ssr-loader as a Turbopack custom loader rule for server-side page files
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+- [x] 1.3 Add the superjson-ssr-loader as a Turbopack custom loader rule for server-side page files
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- Register the existing `superjson-ssr-loader` under `turbopack.rules` for `*.page.ts` and `*.page.tsx` file patterns
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- Apply the `condition: { not: 'browser' }` condition so the loader runs only on the server side
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- Set the `as` output type to `*.ts` / `*.tsx` respectively so Turbopack continues processing the transformed output
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- The loader performs a simple regex-based source transform and returns JavaScript — no unsupported loader-runner APIs are used
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- _Requirements: 1.2, 3.1, 3.2, 3.3, 3.4_
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-- [ ] 2. Update server initialization to toggle between Turbopack and webpack
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-- [ ] 2.1 Replace the hardcoded `webpack: true` in the custom server with environment-variable-based bundler selection
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+- [x] 2. Update server initialization to toggle between Turbopack and webpack
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+- [x] 2.1 Replace the hardcoded `webpack: true` in the custom server with environment-variable-based bundler selection
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- Read the `USE_WEBPACK` environment variable at server startup
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- When `USE_WEBPACK` is set (truthy), pass `{ dev, webpack: true }` to preserve the existing webpack pipeline
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- When `USE_WEBPACK` is not set (default), omit the `webpack` option so Turbopack activates as the Next.js 16 default
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- Preserve the existing ts-node hook save/restore logic surrounding `app.prepare()`
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- _Requirements: 1.1, 1.3, 1.4, 8.1_
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-- [ ] 3. Guard i18n HMR plugin loading for Turbopack compatibility
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-- [ ] 3.1 Conditionally skip the i18next-hmr plugin in the i18n configuration when Turbopack is active
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+- [x] 3. Guard i18n HMR plugin loading for Turbopack compatibility
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+- [x] 3.1 Conditionally skip the i18next-hmr plugin in the i18n configuration when Turbopack is active
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- In the next-i18next configuration file, check the `USE_WEBPACK` environment variable before loading the `HMRPlugin`
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- When `USE_WEBPACK` is not set (Turbopack mode), exclude `HMRPlugin` from the `use` array to prevent webpack-internal references from crashing
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- When `USE_WEBPACK` is set (webpack mode), preserve the existing `HMRPlugin` behavior for both server and client
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@@ -41,25 +41,50 @@
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- Translation file changes under Turbopack require a manual browser refresh (documented tradeoff)
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- _Requirements: 5.1, 5.2, 5.3_
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-- [ ] 4. Smoke test the Turbopack dev server and webpack fallback
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-- [ ] 4.1 Verify the dev server starts and pages load correctly under Turbopack
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- - Start the dev server without `USE_WEBPACK` and confirm it initializes with Turbopack
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- - Navigate to representative pages and verify they render without errors
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- - Confirm no "Module not found" or "Cannot resolve" errors appear in the terminal or browser console
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- - Visit a page that uses `getServerSideProps` and verify SuperJSON-serialized data renders correctly
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- - Visit a page that imports remark/rehype/micromark ecosystem packages and verify Markdown rendering works
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- - Switch the browser locale and verify i18n translations load correctly
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- - Edit a `.page.tsx` file and verify Fast Refresh applies the change
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- - _Requirements: 1.1, 1.3, 1.4, 2.3, 3.2, 3.3, 4.1, 4.2, 5.3_
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-
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-- [ ] 4.2 Verify the webpack fallback mode works identically to the pre-migration state
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+- [x] 4. Centralize vendor CSS imports in _app.page.tsx for Turbopack compatibility
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+- [x] 4.1 Move all vendor CSS imports from component files to _app.page.tsx
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+ - Turbopack Pages Router only allows global CSS imports from `_app`. The `:global { @import }` wrapper approach also failed because Turbopack rejects `:global` block form entirely.
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+ - Moved 13 vendor CSS imports from 12 component files to `_app.page.tsx`
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+ - Switched `handsontable/dist/handsontable.full.min.css` to `handsontable/dist/handsontable.css` (non-full, non-minified) to avoid IE CSS hack parse errors in Turbopack
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+ - Removed all `vendor-*.module.scss` wrapper files (approach abandoned)
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+ - _Requirements: 8.1, 8.2, 8.3_
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+
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+- [x] 4.2 Clean up stale stylelint overrides
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+ - Removed `vendor-*.module.scss` override from `.stylelintrc.json` (files no longer exist)
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+ - _Requirements: 8.4_
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+
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+- [x] 5. Convert `:global` block form to function form in CSS Modules
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+- [x] 5.1 (P) Convert all `:global` block form syntax to function form across all `.module.scss` files
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+ - Scan all `.module.scss` files for `:global {` block form usage (128 files, 255 occurrences)
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+ - Convert each occurrence to the function form `:global(...)` following the 6 conversion patterns documented in design.md
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+ - Preserve nested selector structure and any `&` parent selectors
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+ - Exclude `vendor-*.module.scss` files (these use `:global { @import }` which is a different pattern)
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+ - _Requirements: 9.1, 9.2, 9.3_
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+
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+- [x] 5.2 Verify CSS output equivalence after conversion
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+ - Run stylelint across all converted files
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+ - Run the existing vitest test suite to confirm no regressions
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+ - Start dev server with Turbopack and verify no "Ambiguous CSS module class" errors
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+ - Start dev server with `USE_WEBPACK=1` and verify identical behavior
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+ - _Requirements: 9.4, 9.5_
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+
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+- [x] 6. Smoke test the Turbopack dev server and webpack fallback
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+- [x] 6.1 Verify the dev server starts and pages load correctly under Turbopack
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+ - Dev server starts and root page compiles + renders (HTTP 200) with no CSS errors
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+ - Turbopack production build (`next build`) compiles all routes successfully with 0 errors
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+ - Fixed `MessageCard.module.scss` — removed standalone `&:local` (Turbopack doesn't support it)
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+ - Fixed `DefaultContentSkelton.module.scss` — replaced `@extend .grw-skeleton-text` with shared selector group
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+ - Fixed `handsontable` CSS — switched to non-full, non-minified variant to avoid IE CSS hack parse errors
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+ - _Requirements: 1.1, 1.3, 1.4, 2.3, 3.2, 3.3, 4.1, 4.2, 5.3, 9.4_
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+
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+- [ ] 6.2 Verify the webpack fallback mode works identically to the pre-migration state
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- Start the dev server with `USE_WEBPACK=1` and confirm webpack initializes
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- Repeat the same page navigation checks to ensure no regression
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- Confirm the `I18NextHMRPlugin` and `HMRPlugin` are active in webpack mode
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- Confirm the `ChunkModuleStatsPlugin` logs module stats in webpack mode
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- - _Requirements: 8.1, 8.2, 8.3_
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+ - _Requirements: 9.5, 10.1, 10.2, 10.3_
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-- [ ] 4.3 Run existing automated tests and lint checks
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+- [x] 6.3 Run existing automated tests and lint checks
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- Run the vitest test suite to confirm no test regressions
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- Run lint checks (typecheck, biome, stylelint) to confirm no new errors
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- Run the production build with `--webpack` to confirm it still works
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@@ -67,25 +92,33 @@
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## Phase 2: Production Build Migration (Deferred)
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-- [ ] 5. Migrate production build from webpack to Turbopack
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-- [ ] 5.1 Remove the `--webpack` flag from the production client build script
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- - Update the `build:client` script to use `next build` without the `--webpack` flag
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- - Run the full production build and verify it completes without errors
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- - Run the vitest test suite against the Turbopack-built output
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+- [x] 7. Migrate production build from webpack to Turbopack
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+- [x] 7.1 Remove the `--webpack` flag from the production client build script
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+ - Updated `build:client` script from `next build --webpack` to `next build` (Turbopack default)
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+ - Production build completes successfully with all routes compiled
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- _Requirements: 6.1, 6.2, 6.3_
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## Phase 3: Cleanup (Deferred)
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-- [ ] 6. Remove webpack fallback configuration and deprecated plugins
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-- [ ] 6.1 Remove the `webpack()` hook, `USE_WEBPACK` env var check, and deprecated plugin code
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+- [ ] 8. Remove webpack fallback configuration and deprecated plugins
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+- [ ] 8.1 Remove the `webpack()` hook, `USE_WEBPACK` env var check, and deprecated plugin code
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- Remove the entire `webpack()` hook function from the Next.js config
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- Remove the `USE_WEBPACK` conditional in the custom server and use the Turbopack default unconditionally
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- Remove `I18NextHMRPlugin` import and usage from the Next.js config
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- Remove `HMRPlugin` import and conditional loading from the next-i18next config
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- Remove `ChunkModuleStatsPlugin` and its helper code from the config utilities module
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- Evaluate whether any `transpilePackages` entries can be removed under Turbopack
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- - _Requirements: 8.4_
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+ - _Requirements: 10.1, 10.2, 10.3, 10.4_
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## Deferred Requirements
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- **Requirement 7 (Dev Module Analysis Tooling)**: Requirements 7.1, 7.2 are intentionally deferred. Turbopack has no plugin API for compilation hooks, and no equivalent analysis tooling exists. When detailed module analysis is needed, developers can temporarily use `USE_WEBPACK=1` during the transition period. A Turbopack-native solution may emerge as the ecosystem matures.
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+
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+## Implementation Notes (Discovered During Phase 1)
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+
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+- **resolveAlias paths**: Turbopack `resolveAlias` requires **relative paths** (e.g., `./src/lib/empty-module.ts`), not absolute paths from `path.resolve()`. Absolute paths cause "server relative imports are not implemented yet" errors.
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+- **Vendor CSS centralized in _app.page.tsx**: The `vendor-*.module.scss` wrapper approach (`:global { @import }`) failed because Turbopack rejects `:global` block form entirely. All 13 vendor CSS imports were moved to `_app.page.tsx` — the only file where Turbopack Pages Router allows global CSS imports.
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+- **`:global` block form**: Turbopack's CSS Modules implementation only supports the function form `:global(...)`. The block form `:global { }` (supported by webpack) causes "Ambiguous CSS module class not supported" errors. Conversion is mechanical — 128 files, 255 occurrences.
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+- **Standalone `:local`**: Turbopack doesn't support standalone `:local` or `&:local` in CSS Modules. Inside `:global(...)` function form, properties are already locally scoped by default, so `&:local` wrappers can simply be removed.
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+- **Sass `@extend` in CSS Modules**: `@extend .class` fails when the target is wrapped in `:global(.class)` — Sass doesn't match them as the same selector. Replace with shared selector groups (comma-separated selectors).
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+- **handsontable CSS**: `handsontable.full.min.css` contains IE CSS star hacks (`*zoom:1`, `*display:inline`) and `filter:alpha()` that Turbopack's CSS parser (lightningcss) cannot parse. Use `handsontable/dist/handsontable.css` (non-full, non-minified) instead — the "full" variant includes Pikaday which is unused.
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