fix: add explicit file extensions to annotations

package.json

@@ -57,8 +57,7 @@
     "three": ">=0.128.0"
   },
   "scripts": {
-    "build": "rimraf dist && vite build && tsc --emitDeclarationOnly && copyfiles -u 1 \"src/**/*.d.ts\" dist && copyfiles package.json README.md LICENSE dist && json -I -f dist/package.json -e \"this.private=undefined;this.type=\\\"module\\\";\" && npm run patch-cts",
-    "patch-cts": "node -e \"require('shelljs').find('dist/**/*.d.ts').forEach(f=>{var f2=f.replace(/\\.ts$/,'.cts');require('fs').copyFileSync(f,f2);require('shelljs').sed('-i',/ from '(\\.[^']+)';$/,' from \\'\\$1.cts\\';',f2);require('shelljs').sed('-i',/^declare module '(\\.[^']+)'/,'declare module \\'\\$1.cts\\'',f2)})\"",
+    "build": "rimraf dist && vite build && tsc --emitDeclarationOnly && copyfiles -u 1 \"src/**/*.d.ts\" dist && copyfiles package.json README.md LICENSE dist && json -I -f dist/package.json -e \"this.private=undefined;this.type=\\\"module\\\";\" && node patch-ts.js",
     "lint": "tsc --noEmit"
   }
 }

patch-ts.js

@@ -0,0 +1,23 @@
+const shell = require('shelljs')
+const fs = require('fs')
+
+const files = shell.find('dist/**/*.d.ts')
+
+for (const file of files) {
+  const cts = file.replace('.d.ts', '.d.cts')
+
+  // Add type qualifiers in annotations
+  shell.sed('-i', /(import|export [*{])\s+(?!type\b)/, '$1 type ', file)
+  // Remove .js extensions
+  shell.sed('-i', /from '(\.[^.]+)\.js'/, "from '$1'", file)
+
+  fs.copyFileSync(file, cts)
+
+  // Add explicit .d.ts extensions for ESM
+  shell.sed('-i', / from '(\.[^']+)'/, " from '$1.d.ts'", file)
+  shell.sed('-i', /^declare module '(\.[^']+)'/, "declare module '$1.d.ts'", file)
+
+  // Add explicit .d.cts extensions for CJS
+  shell.sed('-i', / from '(\.[^']+)'/, " from '$1.d.cts'", cts)
+  shell.sed('-i', /^declare module '(\.[^']+)'/, "declare module '$1.d.cts'", cts)
+}