Lucide Solid integrations

These fixtures exercise the built lucide-solid package in real consumer frameworks.

Every fixture runs three checks:

a framework production build;
TypeScript with noEmit;
Vitest Browser Mode in Chromium.

From the repository root, install Chromium once and run the complete suite:

pnpm --filter @lucide/integration-solid-vite exec playwright install chromium
pnpm test:integrations:solid

The fixtures depend on lucide-solid through workspace:*, but import only its public package entry points. The root command builds lucide-solid before running any consumer checks.

Two TypeScript projects per fixture

tsconfig.json typechecks the fixture's own sources with skipLibCheck: true, like the React fixtures do, because the third-party declarations a Vite app pulls in are not clean under TypeScript 6.

tsconfig.declarations.json compiles only src/IconShowcase.tsx — the file that imports the public entry points — with skipLibCheck: false and no ambient types. That makes tsc read the declarations shipped in dist/types instead of skipping them, so a .d.ts that points at a file the build never emitted fails the check. Both run under pnpm typecheck.

Note that this does not reproduce the bug fixed in #4846, where the published declarations imported @lucide/shared/types: inside the workspace that specifier still resolves through packages/lucide-solid/node_modules. Catching that needs a check against the published tarball rather than the workspace link.