build: output ESM

BREAKING CHANGE: switch package to ESM instead of CommonJS

package.json

@@ -4,6 +4,7 @@
   "publishConfig": {
     "access": "public"
   },
+  "type": "module",
   "description": "Error class for Octokit request errors",
   "scripts": {
     "build": "node scripts/build.mjs && tsc -p tsconfig.json",
@@ -27,7 +28,7 @@
     "once": "^1.4.0"
   },
   "devDependencies": {
-    "@octokit/tsconfig": "^2.0.0",
+    "@octokit/tsconfig": "^3.0.0",
     "@types/jest": "^29.0.0",
     "@types/node": "^20.0.0",
     "@types/once": "^1.4.0",

scripts/build.mjs

@@ -43,7 +43,7 @@ async function main() {
       bundle: true,
       platform: "node",
       target: "node18",
-      format: "cjs",
+      format: "esm",
       ...sharedOptions,
     }),
     // Build an ESM browser bundle
@@ -74,10 +74,18 @@ async function main() {
       {
         ...pkg,
         files: ["dist-*/**", "bin/**"],
-        main: "dist-node/index.js",
-        browser: "dist-web/index.js",
-        types: "dist-types/index.d.ts",
-        module: "dist-src/index.js",
+        exports: {
+          ".": {
+            node: {
+              types: "./dist-types/index.d.ts",
+              import: "./dist-node/index.js",
+            },
+            browser: {
+              types: "./dist-types/index.d.ts",
+              import: "./dist-web/index.js",
+            }
+          }
+        },
         sideEffects: false,
         unpkg: "dist-web/index.js",
       },