diff --git a/packages/core/src/constant.ts b/packages/core/src/constant.ts
index 77cbabe84..85913bd83 100644
--- a/packages/core/src/constant.ts
+++ b/packages/core/src/constant.ts
@@ -20,9 +20,9 @@ const JS_EXTENSIONS: string[] = [
   'js',
   'mjs',
   'jsx',
-  '(?<!d.)ts', // ignore d.ts,
-  '(?<!d.)mts', // ditto
-  '(?<!d.)cts', // ditto
+  '(?<!\\.d\\.)ts', // ignore d.ts,
+  '(?<!\\.d\\.)mts', // ditto
+  '(?<!\\.d\\.)cts', // ditto
   'tsx',
   'cjs',
   'cjsx',
diff --git a/packages/core/tests/constant.test.ts b/packages/core/tests/constant.test.ts
index 166725326..5522c2ce6 100644
--- a/packages/core/tests/constant.test.ts
+++ b/packages/core/tests/constant.test.ts
@@ -9,6 +9,8 @@ const jsTestStrings = [
   { str: 'index.js', expected: true },
   { str: './index.ts', expected: true },
   { str: './index.d.ts', expected: false },
+  { str: './spread.ts', expected: true },
+  { str: './index.d.jts', expected: false },
   { str: '/Users/path/index.ts', expected: true },
   { str: '/Users/path/index.d.ts', expected: false },
   { str: '/Users/path/index.d.mts', expected: false },