fix: Publish a CommonJS entrypoint

[razor-x]

Summary

The 0.2.1 release (after the template update) publishes ESM-only — the package exports only an import condition:

".": { "import": { "types": "./index.d.ts", "default": "./index.js" } }

CommonJS consumers fail with Error: No "exports" main defined in .../@seamapi/url-search-params-parser/package.json. This blocks seamapi/nextlove#182, which consumes this package from nextlove's CJS build and its CJS-transformed test runner.

Changes

Restores the dual-format build this repo had before the template update, matching @seamapi/url-search-params-serializer's packaging exactly:

• tsup.config.ts builds dist/index.cjs + dist/index.d.cts (+ sourcemap) from src/index.ts, run via postbuild:entrypoints. The dts build passes ignoreDeprecations: '6.0' because the tsconfig's baseUrl (used for path aliases) is reported as an error under TypeScript 6.
• exports["."].require → ./dist/index.cjs with ./dist/index.d.cts types.
• dist added to published files; tsup added to devDependencies.

Verification

• require('@seamapi/url-search-params-parser') works from Node 22 and parses correctly (strict mode: foo=a,b&bar=2 → {"foo":["a,b"],"bar":2}).
• ESM import unchanged.
• npm test (73 tests) and npm run lint pass.

Releases as 0.2.2.

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Generated by Claude Code

[razor-x]

Closing: no longer needed. nextlove is dropping its CommonJS build and consuming this package as ESM directly (see seamapi/nextlove#182), so the parser can stay ESM-only as the template intends.

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Generated by Claude Code