diff --git a/package.json b/package.json
index e229dff..dde25cf 100644
--- a/package.json
+++ b/package.json
@@ -98,6 +98,10 @@
       "import": "./dist/index.mjs",
       "require": "./dist/index.cjs"
     },
+    "./builder": {
+      "import": "./dist/builder.mjs",
+      "require": "./dist/builder.cjs"
+    },
     "./package.json": "./package.json"
   }
 }
diff --git a/src/builder.ts b/src/builder.ts
new file mode 100644
index 0000000..66ea302
--- /dev/null
+++ b/src/builder.ts
@@ -0,0 +1 @@
+export { Builder } from "./builder/index";
diff --git a/src/builder/index.ts b/src/builder/index.ts
index a0fc4be..c5a02aa 100644
--- a/src/builder/index.ts
+++ b/src/builder/index.ts
@@ -14,15 +14,6 @@ import {
 import { APIBuilder } from "./api-builder";
 import type picomatch from "picomatch";
 
-let pm: typeof picomatch | null = null;
-/* c8 ignore next 6 */
-try {
-  require.resolve("picomatch");
-  pm = require("picomatch");
-} catch {
-  // do nothing
-}
-
 export class Builder<
   TReturnType extends Output = PathsOutput,
   TGlobFunction = typeof picomatch,
@@ -166,7 +157,8 @@ export class Builder<
     patterns: string[],
     ...options: GlobParams<TGlobFunction> | []
   ) {
-    const globFn = (this.globFunction || pm) as GlobFunction | null;
+    const globFn = (this.globFunction ||
+      Builder.defaultGlobFunction) as GlobFunction | null;
     /* c8 ignore next 5 */
     if (!globFn) {
       throw new Error("Please specify a glob function to use glob matching.");
@@ -180,4 +172,6 @@ export class Builder<
     this.options.filters.push((path) => isMatch(path));
     return this;
   }
+
+  static defaultGlobFunction: typeof picomatch | null = null;
 }
diff --git a/src/index.ts b/src/index.ts
index fba8ef8..21c9772 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,18 @@
-import { Builder } from "./builder";
+import type picomatch from "picomatch";
+import { Builder } from "./builder/index";
 
 export { Builder as fdir };
 export type Fdir = typeof Builder;
 
 export * from "./types";
+
+let pm: typeof picomatch | null = null;
+/* c8 ignore next 6 */
+try {
+  require.resolve("picomatch");
+  pm = require("picomatch");
+} catch {
+  // do nothing
+}
+
+Builder.defaultGlobFunction = pm || null;
diff --git a/tsdown.config.ts b/tsdown.config.ts
index aa0ab76..73012df 100644
--- a/tsdown.config.ts
+++ b/tsdown.config.ts
@@ -1,11 +1,11 @@
 import { defineConfig } from 'tsdown/config'
 
 export default defineConfig({
-  entry: 'src/index.ts',
+  entry: ['src/index.ts', 'src/builder.ts'],
   format: ['cjs', 'esm'],
   target: 'node12',
   removeNodeProtocol: true,
   dts: true,
   exports: true,
   fixedExtension: true
-})
\ No newline at end of file
+})