diff --git a/package.json b/package.json
index b652681..295da3f 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "access": "public"
   },
   "scripts": {
-    "build": "pnpm codegen:github && tsc --noEmit && tsdown",
+    "build": "pnpm codegen:github && tsc && tsdown",
     "codegen:github": "graphql-codegen --config src/github/codegen.ts",
     "format": "oxfmt --check",
     "format:fix": "oxfmt",
@@ -66,6 +66,7 @@
     "@graphql-codegen/cli": "^7.0.0",
     "@octokit/core": "^6.1.2",
     "@octokit/graphql": "^8.1.1",
+    "@tsconfig/node22": "^22.0.5",
     "@types/node": "^20.11.24",
     "dotenv": "^16.4.5",
     "oxfmt": "^0.51.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 82b556c..5f10247 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -31,6 +31,9 @@ importers:
       '@octokit/graphql':
         specifier: ^8.1.1
         version: 8.1.1
+      '@tsconfig/node22':
+        specifier: ^22.0.5
+        version: 22.0.5
       '@types/node':
         specifier: ^20.11.24
         version: 20.14.10
@@ -1206,6 +1209,9 @@ packages:
   '@standard-schema/spec@1.1.0':
     resolution: {integrity: sha512-l2aFy5jALhniG5HgqrD6jXLi/rUWrKvqN/qJx6yoJsgKhblVd+iqqU4RCXavm/jPityDo5TCvKMnpjKnOriy0w==}
 
+  '@tsconfig/node22@22.0.5':
+    resolution: {integrity: sha512-hLf2ld+sYN/BtOJjHUWOk568dvjFQkHnLNa6zce25GIH+vxKfvTgm3qpaH6ToF5tu/NN0IH66s+Bb5wElHrLcw==}
+
   '@tybys/wasm-util@0.10.2':
     resolution: {integrity: sha512-RoBvJ2X0wuKlWFIjrwffGw1IqZHKQqzIchKaadZZfnNpsAYp2mM0h36JtPCjNDAHGgYez/15uMBpfGwchhiMgg==}
 
@@ -4234,6 +4240,8 @@ snapshots:
 
   '@standard-schema/spec@1.1.0': {}
 
+  '@tsconfig/node22@22.0.5': {}
+
   '@tybys/wasm-util@0.10.2':
     dependencies:
       tslib: 2.8.1
diff --git a/src/core.ts b/src/core.ts
index 69a70cc..f669cde 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -1,14 +1,14 @@
 import type { GetRepositoryMetadataQuery } from "./github/graphql/generated/operations.js";
-import { CommitMessage } from "./github/graphql/generated/types.js";
+import type { CommitMessage } from "./github/graphql/generated/types.ts";
 import {
   createCommitOnBranchQuery,
   getRepositoryMetadata,
-} from "./github/graphql/queries.js";
-import {
+} from "./github/graphql/queries.ts";
+import type {
   CommitFilesFromBase64Args,
   CommitFilesResult,
   GitBase,
-} from "./interface.js";
+} from "./interface.ts";
 
 const getBaseRef = (base: GitBase): string => {
   if ("branch" in base) {
diff --git a/src/fs.ts b/src/fs.ts
index 1df5456..6dc0c1d 100644
--- a/src/fs.ts
+++ b/src/fs.ts
@@ -1,11 +1,11 @@
 import { promises as fs } from "fs";
 import * as path from "path";
-import type { FileAddition } from "./github/graphql/generated/types.js";
-import {
+import type { FileAddition } from "./github/graphql/generated/types.ts";
+import type {
   CommitFilesFromDirectoryArgs,
   CommitFilesResult,
-} from "./interface.js";
-import { commitFilesFromBuffers } from "./node.js";
+} from "./interface.ts";
+import { commitFilesFromBuffers } from "./node.ts";
 
 export const commitFilesFromDirectory = async ({
   cwd,
diff --git a/src/git.ts b/src/git.ts
index c9bbd00..01fe080 100644
--- a/src/git.ts
+++ b/src/git.ts
@@ -1,12 +1,12 @@
 import { promises as fs } from "fs";
 import { relative, resolve } from "path";
 import git from "isomorphic-git";
-import {
+import type {
   CommitChangesFromRepoArgs,
   CommitFilesFromBuffersArgs,
   CommitFilesResult,
-} from "./interface";
-import { commitFilesFromBuffers } from "./node";
+} from "./interface.ts";
+import { commitFilesFromBuffers } from "./node.ts";
 
 /**
  * @see https://isomorphic-git.org/docs/en/walk#walkerentry-mode
diff --git a/src/github/codegen.ts b/src/github/codegen.ts
index b7eb803..62741b4 100644
--- a/src/github/codegen.ts
+++ b/src/github/codegen.ts
@@ -26,6 +26,7 @@ const config: CodegenConfig = {
       config: {
         // TODO: Look into adding stricter types or use `unknown`
         defaultScalarType: "any",
+        enumsAsTypes: true,
       },
     },
     "src/github/graphql/generated/operations.ts": {
@@ -34,6 +35,7 @@ const config: CodegenConfig = {
         // TODO: Look into adding stricter types or use `unknown`
         defaultScalarType: "any",
         importSchemaTypesFrom: "src/github/graphql/generated/types.ts",
+        importExtension: ".ts",
       },
     },
   },
diff --git a/src/index.ts b/src/index.ts
index 41cdeb7..67c1b4f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-export * as queries from "./github/graphql/queries.js";
-export { commitFilesFromBase64 } from "./core.js";
-export { commitChangesFromRepo } from "./git.js";
-export { commitFilesFromDirectory } from "./fs.js";
+export * as queries from "./github/graphql/queries.ts";
+export { commitFilesFromBase64 } from "./core.ts";
+export { commitChangesFromRepo } from "./git.ts";
+export { commitFilesFromDirectory } from "./fs.ts";
diff --git a/src/interface.ts b/src/interface.ts
index a162b48..0bbafe3 100644
--- a/src/interface.ts
+++ b/src/interface.ts
@@ -1,9 +1,9 @@
 import type {
   CommitMessage,
   FileChanges,
-} from "./github/graphql/generated/types.js";
-import type { GitHubClient } from "./github/graphql/queries.js";
-import type { Logger } from "./logging.js";
+} from "./github/graphql/generated/types.ts";
+import type { GitHubClient } from "./github/graphql/queries.ts";
+import type { Logger } from "./logging.ts";
 
 export type CommitFilesResult = {
   refId: string | null;
diff --git a/src/node.ts b/src/node.ts
index 565d0ea..b87f065 100644
--- a/src/node.ts
+++ b/src/node.ts
@@ -1,5 +1,8 @@
 import { commitFilesFromBase64 } from "./core.js";
-import { CommitFilesFromBuffersArgs, CommitFilesResult } from "./interface.js";
+import type {
+  CommitFilesFromBuffersArgs,
+  CommitFilesResult,
+} from "./interface.ts";
 
 export const commitFilesFromBuffers = async ({
   fileChanges,
diff --git a/tests/integration/fs.test.ts b/tests/integration/fs.test.ts
index 668651a..708a261 100644
--- a/tests/integration/fs.test.ts
+++ b/tests/integration/fs.test.ts
@@ -2,15 +2,15 @@ import { promises as fs } from "fs";
 import * as path from "path";
 import { getOctokit } from "@actions/github";
 import { afterAll, describe, it } from "vitest";
-import { commitFilesFromDirectory } from "../../src/fs.js";
+import { commitFilesFromDirectory } from "../../src/fs.ts";
 import {
   ENV,
   REPO,
   ROOT_TEMP_DIRECTORY,
   ROOT_TEST_BRANCH_PREFIX,
   log,
-} from "./env.js";
-import { deleteBranches } from "./util.js";
+} from "./env.ts";
+import { deleteBranches } from "./util.ts";
 
 const octokit = getOctokit(ENV.GITHUB_TOKEN);
 
diff --git a/tests/integration/git.test.ts b/tests/integration/git.test.ts
index f50039c..f96ff6b 100644
--- a/tests/integration/git.test.ts
+++ b/tests/integration/git.test.ts
@@ -4,16 +4,16 @@ import path from "path";
 import { getOctokit } from "@actions/github";
 import git from "isomorphic-git";
 import { afterAll, describe, expect, it, vi } from "vitest";
-import { commitChangesFromRepo } from "../../src/git";
-import { getRefTreeQuery } from "../../src/github/graphql/queries";
+import { commitChangesFromRepo } from "../../src/git.ts";
+import { getRefTreeQuery } from "../../src/github/graphql/queries.ts";
 import {
   ENV,
   REPO,
   ROOT_TEMP_DIRECTORY,
   ROOT_TEST_BRANCH_PREFIX,
   log,
-} from "./env";
-import { deleteBranches, waitForGitHubToBeReady } from "./util";
+} from "./env.ts";
+import { deleteBranches, waitForGitHubToBeReady } from "./util.ts";
 
 const octokit = getOctokit(ENV.GITHUB_TOKEN);
 
diff --git a/tests/integration/node.test.ts b/tests/integration/node.test.ts
index 88d7859..1d0aacc 100644
--- a/tests/integration/node.test.ts
+++ b/tests/integration/node.test.ts
@@ -2,15 +2,15 @@ import { promises as fs } from "fs";
 import { getOctokit } from "@actions/github";
 import git from "isomorphic-git";
 import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
-import { CommitMessage } from "../../src/github/graphql/generated/types.js";
+import type { CommitMessage } from "../../src/github/graphql/generated/types.ts";
 import {
   createRefMutation,
   getRefTreeQuery,
   getRepositoryMetadata,
-} from "../../src/github/graphql/queries.js";
-import { commitFilesFromBuffers } from "../../src/node.js";
-import { ENV, REPO, ROOT_TEST_BRANCH_PREFIX, log } from "./env.js";
-import { deleteBranches, waitForGitHubToBeReady } from "./util.js";
+} from "../../src/github/graphql/queries.ts";
+import { commitFilesFromBuffers } from "../../src/node.ts";
+import { ENV, REPO, ROOT_TEST_BRANCH_PREFIX, log } from "./env.ts";
+import { deleteBranches, waitForGitHubToBeReady } from "./util.ts";
 
 // TODO: re-enable strict tree tests when GitHub have addressed the createRef
 // bug that's currently used in integration tests
diff --git a/tests/integration/util.ts b/tests/integration/util.ts
index 3ba84d8..4b7a52f 100644
--- a/tests/integration/util.ts
+++ b/tests/integration/util.ts
@@ -1,7 +1,7 @@
 import {
   deleteRefMutation,
   getRepositoryMetadata,
-  GitHubClient,
+  type GitHubClient,
 } from "../../src/github/graphql/queries.js";
 import { REPO } from "./env.js";
 
diff --git a/tsconfig.base.json b/tsconfig.base.json
deleted file mode 100644
index 5e98224..0000000
--- a/tsconfig.base.json
+++ /dev/null
@@ -1,22 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/tsconfig",
-  "display": "Default",
-  "compilerOptions": {
-    "declaration": true,
-    "declarationMap": true,
-    "esModuleInterop": true,
-    "incremental": false,
-    "isolatedModules": true,
-    "lib": ["es2022", "DOM", "DOM.Iterable"],
-    "module": "ESNext",
-    "moduleDetection": "force",
-    "moduleResolution": "Bundler",
-    "noUncheckedIndexedAccess": true,
-    "resolveJsonModule": true,
-    "skipLibCheck": true,
-    "strict": true,
-    "target": "ES2022",
-    "noUnusedLocals": true,
-    "noUnusedParameters": true
-  }
-}
diff --git a/tsconfig.json b/tsconfig.json
index fa266dc..4541472 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,10 +1,19 @@
 {
-  "extends": "./tsconfig.base.json",
+  "extends": "@tsconfig/node22/tsconfig.json",
   "compilerOptions": {
-    "types": ["node"],
-    "rootDir": ".",
-    "outDir": "dist"
+    "allowImportingTsExtensions": true,
+    "erasableSyntaxOnly": true,
+    "verbatimModuleSyntax": true,
+    "strict": true,
+    "noEmit": true,
+    "lib": [
+      "ES2024",
+      "ES2025.Promise",
+      "ESNext.Array",
+      "ESNext.Collection",
+      "ESNext.Iterator"
+    ],
+    "types": ["node"]
   },
-  "include": ["src"],
-  "exclude": ["node_modules", "dist"]
+  "include": ["./"]
 }
diff --git a/tsconfig.lint.json b/tsconfig.lint.json
deleted file mode 100644
index f0d9c7b..0000000
--- a/tsconfig.lint.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "extends": "./tsconfig.base.json",
-  "compilerOptions": {
-    "outDir": "dist"
-  },
-  "include": ["src", "turbo", "tsdown.config.ts"],
-  "exclude": ["node_modules", "dist"]
-}