feat: make library ESM only + use tsup to bundle library - #140
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tsup is no longer actively maintained; tsdown (built on rolldown) is the recommended replacement. This also drops the transitive dependency on esbuild, which resolves a source of outdated dependency alerts. The tsdown config preserves the existing output file names (index.js and index.d.ts for the ESM build, rather than tsdown's default .mjs and .d.mts), so the published package layout is unchanged. The moduleResolution setting was changed from "node" to "bundler" because tsdown only declares its types under an exports field, which the legacy resolver cannot resolve.
The package is only consumed from ESM contexts, so there is no need to ship a CommonJS bundle alongside the ESM one. Since `dist/index.cjs` is no longer produced, the `require` condition is removed from the `exports` map and `main` now points at the ESM bundle. The `module` field is also removed; it only existed to distinguish the ESM bundle from the CommonJS `main`.
Drop the custom `outExtensions` in favor of the tsdown defaults, so the bundle is emitted as `index.mjs` with types in `index.d.mts`. The `main`, `types`, and `exports` fields are updated to match, as is the import in the `docs-builder` CLI script.
chrispcampbell
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chrispcampbell
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Fixes #138
See issue for details.