fix: should collect indentifier module declaration

fix #419

Author: qmhc

examples/ts-vite/src/modules.ts

@@ -2,4 +2,13 @@ declare module 'tslib' {
   export type Test = { newField: string }
 }
 
+declare global {
+  // eslint-disable-next-line @typescript-eslint/no-namespace
+  namespace jest {
+    interface Matchers<R> {
+      toChildSnapshot: (filename: string, name: string) => R
+    }
+  }
+}
+
 export {}

packages/unplugin-dts/src/core/transform.ts

@@ -245,15 +245,18 @@ export function transformCode(options: {
         node.body.statements.some(isVLSNode)
       ) {
         s.remove(node.pos, node.end)
-      } else if (ts.isStringLiteral(node.name)) {
-        const libName = toLibName(node.name.text)
+      } else {
+        let libName = ''
+        if (ts.isStringLiteral(node.name)) {
+          libName = toLibName(node.name.text)
 
-        if (libName !== node.name.text) {
-          s.update(node.name.pos, node.name.end, ` '${libName}'`)
+          if (libName !== node.name.text) {
+            s.update(node.name.pos, node.name.end, ` '${libName}'`)
+          }
         }
 
         if (
-          !libName.startsWith('.') &&
+          (!libName || !libName.startsWith('.')) &&
           node.modifiers?.[0] &&
           node.modifiers[0].kind === ts.SyntaxKind.DeclareKeyword &&
           !node.body.statements.some(