meta: fix `js2ts` script (#4844)

private/js2ts/index.mjs

@@ -6,6 +6,7 @@
  */
 
 import { opendir, readFile, open, writeFile, rm } from 'node:fs/promises'
+import { createRequire } from 'node:module'
 import { argv } from 'node:process'
 import { basename, extname, join } from 'node:path'
 import { existsSync } from 'node:fs'
@@ -26,13 +27,30 @@ if (packageJSON.type !== 'module') {
   throw new Error('Cannot convert non-ESM package to TS')
 }
 
-const references = Object.keys(packageJSON.dependencies || {})
+const uppyDeps = Object.keys(packageJSON.dependencies || {})
   .concat(Object.keys(packageJSON.peerDependencies || {}))
   .concat(Object.keys(packageJSON.devDependencies || {}))
   .filter((pkg) => pkg.startsWith('@uppy/'))
-  .map((pkg) => ({
-    path: `../${pkg.slice('@uppy/'.length)}/tsconfig.build.json`,
-  }))
+
+const paths = Object.fromEntries(
+  (function* generatePaths() {
+    const require = createRequire(packageRoot)
+    for (const pkg of uppyDeps) {
+      const nickname = pkg.slice('@uppy/'.length)
+      // eslint-disable-next-line import/no-dynamic-require
+      const pkgJson = require(`../${nickname}/package.json`)
+      if (pkgJson.exports?.['.']) {
+        yield [pkg, [`../${nickname}/${pkgJson.exports['.']}`]]
+      } else if (pkgJson.main) {
+        yield [pkg, [`../${nickname}/${pkgJson.main}`]]
+      }
+      yield [`${pkg}/*`, [`../${nickname}/*`]]
+    }
+  })(),
+)
+const references = uppyDeps.map((pkg) => ({
+  path: `../${pkg.slice('@uppy/'.length)}/tsconfig.build.json`,
+}))
 
 const depsNotYetConvertedToTS = references.filter(
   (ref) => !existsSync(new URL(ref.path, packageRoot)),
@@ -93,6 +111,7 @@ await tsConfig.writeFile(
       compilerOptions: {
         emitDeclarationOnly: false,
         noEmit: true,
+        paths,
       },
       include: ['./package.json', './src/**/*.*'],
       references,
@@ -110,10 +129,11 @@ await writeFile(
     {
       extends: '../../../tsconfig.shared',
       compilerOptions: {
+        noImplicitAny: false,
         outDir: './lib',
-        rootDir: './src',
+        paths,
         resolveJsonModule: false,
-        noImplicitAny: false,
+        rootDir: './src',
         skipLibCheck: true,
       },
       include: ['./src/**/*.*'],