diff --git a/__tests__/util.test.ts b/__tests__/util.test.ts
index 87e0ad3..4491066 100644
--- a/__tests__/util.test.ts
+++ b/__tests__/util.test.ts
@@ -10,6 +10,7 @@ import {
 } from '../src/util';
 
 import { assert, describe, expect, it } from 'vitest';
+import * as path from 'path';
 
 describe('util', () => {
   describe('uploadUrl', () => {
@@ -385,7 +386,7 @@ describe('util', () => {
   describe('paths', () => {
     it('resolves files given a set of paths', async () => {
       assert.deepStrictEqual(paths(['tests/data/**/*', 'tests/data/does/not/exist/*']), [
-        'tests/data/foo/bar.txt',
+        path.join('tests', 'data', 'foo', 'bar.txt'),
       ]);
     });
   });
diff --git a/src/github.ts b/src/github.ts
index 9fc103d..d40e2a0 100644
--- a/src/github.ts
+++ b/src/github.ts
@@ -3,64 +3,11 @@ import { statSync } from 'fs';
 import { open } from 'fs/promises';
 import { lookup } from 'mime-types';
 import { basename } from 'path';
-import { alignAssetName, Config, isTag, releaseBody } from './util';
+import { alignAssetName, isTag, releaseBody } from './util';
+import { ReleaseAsset, Config, Releaser, Release } from './interfaces';
 
 type GitHub = InstanceType<typeof GitHub>;
 
-export interface ReleaseAsset {
-  name: string;
-  mime: string;
-  size: number;
-}
-
-export interface Release {
-  id: number;
-  upload_url: string;
-  html_url: string;
-  tag_name: string;
-  name: string | null;
-  body?: string | null | undefined;
-  target_commitish: string;
-  draft: boolean;
-  prerelease: boolean;
-  assets: Array<{ id: number; name: string }>;
-}
-
-export interface Releaser {
-  getReleaseByTag(params: { owner: string; repo: string; tag: string }): Promise<{ data: Release }>;
-
-  createRelease(params: {
-    owner: string;
-    repo: string;
-    tag_name: string;
-    name: string;
-    body: string | undefined;
-    draft: boolean | undefined;
-    prerelease: boolean | undefined;
-    target_commitish: string | undefined;
-    discussion_category_name: string | undefined;
-    generate_release_notes: boolean | undefined;
-    make_latest: 'true' | 'false' | 'legacy' | undefined;
-  }): Promise<{ data: Release }>;
-
-  updateRelease(params: {
-    owner: string;
-    repo: string;
-    release_id: number;
-    tag_name: string;
-    target_commitish: string;
-    name: string;
-    body: string | undefined;
-    draft: boolean | undefined;
-    prerelease: boolean | undefined;
-    discussion_category_name: string | undefined;
-    generate_release_notes: boolean | undefined;
-    make_latest: 'true' | 'false' | 'legacy' | undefined;
-  }): Promise<{ data: Release }>;
-
-  allReleases(params: { owner: string; repo: string }): AsyncIterableIterator<{ data: Release[] }>;
-}
-
 export class GitHubReleaser implements Releaser {
   github: GitHub;
   constructor(github: GitHub) {
diff --git a/src/interfaces/configInterface.ts b/src/interfaces/configInterface.ts
new file mode 100644
index 0000000..f5590bc
--- /dev/null
+++ b/src/interfaces/configInterface.ts
@@ -0,0 +1,22 @@
+export interface Config {
+  github_token: string;
+  github_ref: string;
+  github_repository: string;
+  // user provided
+  input_name?: string;
+  input_tag_name?: string;
+  input_repository?: string;
+  input_body?: string;
+  input_body_path?: string;
+  input_files?: string[];
+  input_overwrite_files?: boolean;
+  input_draft?: boolean;
+  input_preserve_order?: boolean;
+  input_prerelease?: boolean;
+  input_fail_on_unmatched_files?: boolean;
+  input_target_commitish?: string;
+  input_discussion_category_name?: string;
+  input_generate_release_notes?: boolean;
+  input_append_body?: boolean;
+  input_make_latest: 'true' | 'false' | 'legacy' | undefined;
+}
diff --git a/src/interfaces/index.ts b/src/interfaces/index.ts
new file mode 100644
index 0000000..ce1fa6b
--- /dev/null
+++ b/src/interfaces/index.ts
@@ -0,0 +1,4 @@
+export * from './configInterface';
+export * from './releaserInterface';
+export * from './releaseAssetInterface';
+export * from './releaseInterface';
diff --git a/src/interfaces/releaseAssetInterface.ts b/src/interfaces/releaseAssetInterface.ts
new file mode 100644
index 0000000..0c569d5
--- /dev/null
+++ b/src/interfaces/releaseAssetInterface.ts
@@ -0,0 +1,5 @@
+export interface ReleaseAsset {
+  name: string;
+  mime: string;
+  size: number;
+}
diff --git a/src/interfaces/releaseInterface.ts b/src/interfaces/releaseInterface.ts
new file mode 100644
index 0000000..e654dee
--- /dev/null
+++ b/src/interfaces/releaseInterface.ts
@@ -0,0 +1,12 @@
+export interface Release {
+  id: number;
+  upload_url: string;
+  html_url: string;
+  tag_name: string;
+  name: string | null;
+  body?: string | null | undefined;
+  target_commitish: string;
+  draft: boolean;
+  prerelease: boolean;
+  assets: Array<{ id: number; name: string }>;
+}
diff --git a/src/interfaces/releaserInterface.ts b/src/interfaces/releaserInterface.ts
new file mode 100644
index 0000000..1c39dfe
--- /dev/null
+++ b/src/interfaces/releaserInterface.ts
@@ -0,0 +1,36 @@
+import { Release } from './releaseInterface';
+
+export interface Releaser {
+  getReleaseByTag(params: { owner: string; repo: string; tag: string }): Promise<{ data: Release }>;
+
+  createRelease(params: {
+    owner: string;
+    repo: string;
+    tag_name: string;
+    name: string;
+    body: string | undefined;
+    draft: boolean | undefined;
+    prerelease: boolean | undefined;
+    target_commitish: string | undefined;
+    discussion_category_name: string | undefined;
+    generate_release_notes: boolean | undefined;
+    make_latest: 'true' | 'false' | 'legacy' | undefined;
+  }): Promise<{ data: Release }>;
+
+  updateRelease(params: {
+    owner: string;
+    repo: string;
+    release_id: number;
+    tag_name: string;
+    target_commitish: string;
+    name: string;
+    body: string | undefined;
+    draft: boolean | undefined;
+    prerelease: boolean | undefined;
+    discussion_category_name: string | undefined;
+    generate_release_notes: boolean | undefined;
+    make_latest: 'true' | 'false' | 'legacy' | undefined;
+  }): Promise<{ data: Release }>;
+
+  allReleases(params: { owner: string; repo: string }): AsyncIterableIterator<{ data: Release[] }>;
+}
diff --git a/src/util.ts b/src/util.ts
index c6e2b4d..315e088 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -1,28 +1,7 @@
 import * as glob from 'glob';
 import { statSync, readFileSync } from 'fs';
 
-export interface Config {
-  github_token: string;
-  github_ref: string;
-  github_repository: string;
-  // user provided
-  input_name?: string;
-  input_tag_name?: string;
-  input_repository?: string;
-  input_body?: string;
-  input_body_path?: string;
-  input_files?: string[];
-  input_overwrite_files?: boolean;
-  input_draft?: boolean;
-  input_preserve_order?: boolean;
-  input_prerelease?: boolean;
-  input_fail_on_unmatched_files?: boolean;
-  input_target_commitish?: string;
-  input_discussion_category_name?: string;
-  input_generate_release_notes?: boolean;
-  input_append_body?: boolean;
-  input_make_latest: 'true' | 'false' | 'legacy' | undefined;
-}
+import { Config } from './interfaces';
 
 export const uploadUrl = (url: string): string => {
   const templateMarkerPos = url.indexOf('{');