Variable: PACKAGE_TSUP_CONFIG_BASE

const PACKAGE_TSUP_CONFIG_BASE: "import type { Options } from 'tsup';\n\nexport const basePreset: Options = {\n  entry: ['src/index.ts'],\n  format: ['esm', 'cjs'],\n  dts: { compilerOptions: { composite: false, incremental: false } },\n  sourcemap: true,\n  clean: true,\n  target: 'node22',\n  outDir: 'dist',\n};\n";

Defined in: packages/core/src/errors.ts:188

Content of the tsup.config.base.ts that mode package expects one level above packagesDir.