📝 Update CONTRIBUTING.md

Author: coyotte508

CONTRIBUTING.md

@@ -29,6 +29,6 @@ If you want to run only specific tests, you can do `pnpm test -- -t "test name"`
   - `doc-<package name>` (don't forget to edit the `start` command too)
 - Add the `<package-name>-publish.yml` file in the `.github/workflows` folder, inspired from the other packages
 - Add the package in the main README.md
-- Add a `tsup.config.ts` file in the package folder, inspired from the other packages, or just use `tsup src/index.ts --format cjs,esm --clean --dts` as the build command
+- Add a `tsup.config.ts` file in the package folder, inspired from the other packages, or just use `tsup src/index.ts --format cjs,esm --clean && tsc --emitDeclarationOnly --declaration` as the build command
 - Copy `.prettierignore` from another package
 - Add a `tsconfig.json`