Use explicit ts specifiers for declarations

Restore explicit .ts relative specifiers in source and enable rewriteRelativeImportExtensions so emitted JS uses .js while declarations keep explicit .ts specifiers. Add a NodeNext declaration-consumer gate to prevent extensionless declaration regressions.

scripts/verify-node-next-types.ts

@@ -0,0 +1,160 @@
+/**
+ * Verify that built package declarations are consumable by a standard external
+ * TypeScript ESM project using NodeNext resolution.
+ *
+ * Run after `pnpm run build` has emitted declaration files under package
+ * `lib/types` directories.
+ */
+
+import { execFileSync } from 'node:child_process'
+import { existsSync, globSync, mkdirSync, mkdtempSync, readFileSync, rmSync, symlinkSync, writeFileSync } from 'node:fs'
+import { dirname, resolve } from 'node:path'
+
+const root = resolve(import.meta.dirname, '..')
+
+interface ExportTarget {
+  types?: string
+}
+
+interface PackageManifest {
+  name?: string
+  types?: string
+  exports?: Record<string, ExportTarget | string | null>
+}
+
+interface WorkspacePackage {
+  dir: string
+  name: string
+  manifest: PackageManifest
+}
+
+function readPackage(path: string): WorkspacePackage | null {
+  const manifest = JSON.parse(readFileSync(path, 'utf8')) as PackageManifest
+  if (!manifest.name) return null
+  return { dir: dirname(path), name: manifest.name, manifest }
+}
+
+function workspacePackages(): WorkspacePackage[] {
+  return [
+    ...globSync('vendor/*/package.json', { cwd: root }),
+    ...globSync('packages/*/*/package.json', { cwd: root }),
+  ]
+    .map(path => readPackage(resolve(root, path)))
+    .filter(pkg => pkg !== null)
+    .sort((a, b) => a.name.localeCompare(b.name))
+}
+
+const declarationSpecifierPattern = /(?:from\s*|import\s*\(\s*|import\s+|declare\s+module\s*)["'](\.{0,2}(?:\/[^"']*)?)["']/g
+const hasExtension = /\.[^/.]+$/
+
+function extensionlessRelativeSpecifiers(): string[] {
+  const errors: string[] = []
+  const files = [
+    ...globSync('vendor/*/lib/types/**/*.d.ts', { cwd: root }),
+    ...globSync('packages/*/*/lib/types/**/*.d.ts', { cwd: root }),
+  ].sort()
+
+  for (const file of files) {
+    const text = readFileSync(resolve(root, file), 'utf8')
+    for (const match of text.matchAll(declarationSpecifierPattern)) {
+      const specifier = match[1]
+      if (!specifier) continue
+      const isRelative = specifier === '.' || specifier.startsWith('./') || specifier.startsWith('../')
+      if (isRelative && !hasExtension.test(specifier)) errors.push(`${file}: ${specifier}`)
+    }
+  }
+
+  return errors
+}
+
+function publicSpecifiers(pkg: WorkspacePackage): string[] {
+  const specifiers = new Set<string>()
+  if (pkg.manifest.types) specifiers.add(pkg.name)
+
+  for (const [key, target] of Object.entries(pkg.manifest.exports ?? {})) {
+    if (key.includes('*') || key === './package.json') continue
+    if (typeof target !== 'object' || target === null || !target.types) continue
+    specifiers.add(key === '.' ? pkg.name : `${pkg.name}/${key.slice(2)}`)
+  }
+
+  return [...specifiers].sort()
+}
+
+function linkPackage(pkg: WorkspacePackage, nodeModules: string): void {
+  const parts = pkg.name.split('/')
+  const link = resolve(nodeModules, ...parts)
+  mkdirSync(dirname(link), { recursive: true })
+  symlinkSync(pkg.dir, link, 'dir')
+}
+
+const packages = workspacePackages()
+const badSpecifiers = extensionlessRelativeSpecifiers()
+if (badSpecifiers.length > 0) {
+  console.error('verify-node-next-types: declaration files still contain extensionless relative specifiers.')
+  console.error(badSpecifiers.join('\n'))
+  process.exit(1)
+}
+
+const missingOutputs = packages
+  .filter(pkg => pkg.manifest.types && !existsSync(resolve(pkg.dir, pkg.manifest.types)))
+  .map(pkg => `${pkg.name}: missing ${pkg.manifest.types}`)
+
+if (missingOutputs.length > 0) {
+  console.error('verify-node-next-types: build outputs are missing; run `pnpm run build` first.')
+  console.error(missingOutputs.join('\n'))
+  process.exit(1)
+}
+
+const tmp = mkdtempSync(resolve(root, '.node-next-types-'))
+let failed = false
+
+try {
+  const nodeModules = resolve(tmp, 'node_modules')
+  mkdirSync(nodeModules, { recursive: true })
+  for (const pkg of packages) linkPackage(pkg, nodeModules)
+
+  const rootTypes = resolve(root, 'node_modules/@types/node')
+  if (existsSync(rootTypes)) {
+    const typesDir = resolve(nodeModules, '@types')
+    mkdirSync(typesDir, { recursive: true })
+    symlinkSync(rootTypes, resolve(typesDir, 'node'), 'dir')
+  }
+
+  writeFileSync(resolve(tmp, 'package.json'), `${JSON.stringify({ type: 'module', private: true }, null, 2)}\n`)
+  writeFileSync(resolve(tmp, 'tsconfig.json'), `${JSON.stringify({
+    compilerOptions: {
+      target: 'es2024',
+      module: 'NodeNext',
+      moduleResolution: 'NodeNext',
+      strict: true,
+      // Third-party SDK declarations can have their own lib-check noise under a
+      // symlinked temp install. The explicit scan above owns our regression:
+      // extensionless relative specifiers in built declarations.
+      skipLibCheck: true,
+      preserveSymlinks: true,
+      noEmit: true,
+      types: ['node'],
+    },
+    include: ['index.ts'],
+  }, null, 2)}\n`)
+
+  const imports = packages.flatMap(publicSpecifiers)
+    .map((specifier, index) => `import * as mod${index} from ${JSON.stringify(specifier)};\nvoid mod${index};`)
+    .join('\n')
+  writeFileSync(resolve(tmp, 'index.ts'), `${imports}\n`)
+
+  execFileSync(resolve(root, 'node_modules/.bin/tsc'), ['-p', resolve(tmp, 'tsconfig.json'), '--pretty', 'false'], {
+    cwd: root,
+    stdio: 'pipe',
+  })
+  console.log(`verify-node-next-types: ${packages.length} workspace package declaration surface(s) compile under NodeNext.`)
+} catch (error: unknown) {
+  failed = true
+  const output = error as { stdout?: Buffer; stderr?: Buffer }
+  console.error('verify-node-next-types: NodeNext consumer typecheck failed.\n')
+  console.error(`${output.stdout?.toString() ?? ''}${output.stderr?.toString() ?? ''}`)
+} finally {
+  rmSync(tmp, { recursive: true, force: true })
+}
+
+if (failed) process.exit(1)