53 lines
2.6 KiB
Markdown
53 lines
2.6 KiB
Markdown
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# ADR 0008: tsdown for JS bundling instead of dumble
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Status: accepted (2026-06-11)
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## Context
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The initial build used **dumble**, the cordiverse zero-config esbuild wrapper
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that upstream Cordis itself builds with — maximum alignment with the vendored
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packages' conventions (it reads each package.json and infers entries/formats
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from the `exports` field). But dumble is a liability as a load-bearing tool in
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this repo: v0.2.x, ~530 npm downloads/week, effectively one maintainer, and we
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were invoking it through a custom orchestration script (`scripts/build.ts`)
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because it has no workspace mode.
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Build output currently matters only for `yarn build` + publint (nothing
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publishes yet; dev/test/demo run unbuilt via tsx), so the switching cost is at
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its lowest now and only grows once packages publish.
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## Decision
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Replace dumble with **tsdown** (rolldown-based, ~2.5M downloads/week,
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VoidZero-backed, actively released):
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- Root `tsdown.config.ts` with `workspace: ['vendor/*', 'packages/*']`
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(explicit globs, not `workspace: true`, which would also pick up
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`examples/*` — they have package.json files but are not yarn workspaces).
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- Shared shape: entry `src/index.ts`, `outDir: 'lib'`, ESM, `platform: node`,
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`target: es2024`, `fixedExtension: false` (keeps `.js` for
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`"type": "module"` packages), `dts: false` (tsc -b owns declarations),
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`clean: false` (lib/ holds tsc's .d.ts output).
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- Two per-package overrides in vendor/ (ours, like the regenerated tsconfigs;
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logged in vendor/README.md): schemastery (dual `.mjs`/`.cjs` via
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`outExtensions`), logger-console (two single-entry passes so the shared
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base class is inlined into each entry instead of a hash-named chunk,
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matching upstream's published shape).
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- `scripts/build.ts` deleted; `yarn build` = `tsc -b && tsdown`.
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Alternatives considered: **direct esbuild script** (most established engine,
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zero wrapper risk, but hand-maintains the per-package spec table tsdown's
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workspace mode gives us); **pkgroll** (closest drop-in philosophically, but
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78k dl/wk and Rollup-based — strictly weaker maintenance story than tsdown);
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**keep dumble** (perfect upstream alignment, unacceptable bus factor).
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## Consequences
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Output file lists are byte-for-byte-list identical to dumble's (verified by
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snapshot diff at migration time); externals still come from each package's
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dependencies/peerDependencies. We give up dumble's exports-field inference —
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new packages with non-default shapes need a per-package `tsdown.config.ts`
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instead of just package.json fields. Future option: tsdown could also absorb
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declaration bundling (isolatedDeclarations) if `tsc -b` ever becomes the
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bottleneck; that would be a new ADR.
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