Build-output policy and build guards shared by System F Software's tsdown packages: a quiet log level that keeps every actionable warning, an entry-size budget for startup-sensitive plugins, and an api-extractor wrapper that drops its success chatter.

Every entry is plain JavaScript with declaration files, so it loads from node_modules under Node 24 without type stripping.

Add the package as a devDependency. It is distributed as a workspace tarball of the systemfsoftware flake (packages.<system>.tsdown-config), which lib.mkConsumerStore serves to an offline pnpm install.

Both peers are optional: install the one for the entry you use.

Spread it into the config and build with tsdown -l warn. The CLI flag silences the startup banner, which is printed before the config loads; quietBuild drops the one non-actionable rolldown-plugin-dts warning about TypeScript 7's API and leaves every other warning in place.

// tsdown.config.ts
import { quietBuild } from '@systemfsoftware/tsdown-config/quiet-build'
import { defineConfig } from 'tsdown'

export default defineConfig({ ...quietBuild, entry: ['src/index.ts'] })

A rolldown plugin that fails the build when an index.js entry statically pulls more than maxBytes (default 32 KiB), or leaves effect external. Dynamic imports are not counted.

import { eagerEntryBudget } from '@systemfsoftware/tsdown-config/eager-entry-budget'

export default defineConfig({ entry: ['src/index.ts'], plugins: [eagerEntryBudget({ maxBytes: 64 * 1024 })] })

Runs the api-extractor your package resolves from its own node_modules/.bin, forwards stderr, and drops only the lines API Extractor prints on success. A non-zero exit prints the full output unfiltered.

{ "scripts": { "api:check": "api-extractor-quiet run" } }

Apache-2.0