diff --git a/src/converters/assimp.ts b/src/converters/assimp.ts
index 9db38ce..95aa2b9 100644
--- a/src/converters/assimp.ts
+++ b/src/converters/assimp.ts
@@ -1,6 +1,6 @@
 import { execFile as execFileOriginal } from "node:child_process";
 
-type ExecFileFn = (
+export type ExecFileFn = (
   cmd: string,
   args: string[],
   callback: (err: Error | null, stdout: string, stderr: string) => void,
diff --git a/tests/assimp.test.ts b/tests/assimp.test.ts
index 062c115..fea0e9f 100644
--- a/tests/assimp.test.ts
+++ b/tests/assimp.test.ts
@@ -1,12 +1,6 @@
 import type { ExecFileException } from "node:child_process";
 import { expect, test } from "bun:test";
-import { convert } from "../src/converters/assimp";
-
-type ExecFileFn = (
-  cmd: string,
-  args: string[],
-  callback: (err: Error | null, stdout: string, stderr: string) => void,
-) => void;
+import { convert, ExecFileFn } from "../src/converters/assimp";
 
 test("convert resolves when execFile succeeds", async () => {
   const originalConsoleLog = console.log;