feat: switch to ESM output (#678)

BREAKING CHANGE: Output a single ESM bundle

README.md

@@ -87,8 +87,7 @@ Node
 Install with <code>npm install @octokit/request</code>
 
 ```js
-const { request } = require("@octokit/request");
-// or: import { request } from "@octokit/request";
+import { request } from "@octokit/request";
 ```
 
 </td></tr>

package.json

@@ -1,6 +1,7 @@
 {
   "name": "@octokit/request",
   "version": "0.0.0-development",
+  "type": "module",
   "publishConfig": {
     "access": "public"
   },
@@ -10,7 +11,7 @@
     "lint": "prettier --check '{src,test}/**/*' README.md package.json",
     "lint:fix": "prettier --write '{src,test}/**/*' README.md package.json",
     "pretest": "npm run -s lint",
-    "test": "jest --coverage"
+    "test": "NODE_OPTIONS=\"$NODE_OPTIONS --experimental-vm-modules\" npx jest --coverage"
   },
   "repository": "github:octokit/request.js",
   "keywords": [
@@ -22,36 +23,40 @@
   "author": "Gregor Martynus (https://github.com/gr2m)",
   "license": "MIT",
   "dependencies": {
-    "@octokit/endpoint": "^9.0.0",
-    "@octokit/request-error": "^5.0.0",
+    "@octokit/endpoint": "^10.0.0",
+    "@octokit/request-error": "^6.0.1",
     "@octokit/types": "^12.0.0",
-    "universal-user-agent": "^6.0.0"
+    "universal-user-agent": "^7.0.2"
   },
   "devDependencies": {
     "@octokit/auth-app": "^6.0.0",
-    "@octokit/tsconfig": "^2.0.0",
+    "@octokit/tsconfig": "^3.0.0",
     "@types/fetch-mock": "^7.2.4",
     "@types/jest": "^29.0.0",
     "@types/lolex": "^5.1.0",
     "@types/node": "^20.0.0",
     "@types/once": "^1.4.0",
+    "@types/sinonjs__fake-timers": "^8.1.5",
+    "@sinonjs/fake-timers": "^11.2.2",
     "esbuild": "^0.20.0",
     "fetch-mock": "npm:@gr2m/fetch-mock@^9.11.0-pull-request-644.1",
     "glob": "^10.2.4",
     "jest": "^29.0.0",
-    "lolex": "^6.0.0",
     "prettier": "3.2.5",
     "semantic-release-plugin-update-version-in-files": "^1.0.0",
-    "string-to-arraybuffer": "^1.0.2",
     "ts-jest": "^29.0.0",
     "typescript": "^5.0.0"
   },
   "jest": {
+    "extensionsToTreatAsEsm": [
+      ".ts"
+    ],
     "transform": {
       "^.+\\.(ts|tsx)$": [
         "ts-jest",
         {
-          "tsconfig": "test/tsconfig.test.json"
+          "tsconfig": "test/tsconfig.test.json",
+          "useESM": true
         }
       ]
     },
@@ -66,6 +71,7 @@
     "modulePathIgnorePatterns": [
       "<rootDir>/pkg"
     ],
+    "testEnvironment": "node",
     "moduleNameMapper": {
       "^(.+)\\.jsx?$": "$1"
     }

scripts/build.mjs

@@ -35,27 +35,14 @@ async function main() {
 
   const entryPoints = ["./pkg/dist-src/index.js"];
 
-  await Promise.all([
-    // Build the a CJS Node.js bundle
-    esbuild.build({
-      entryPoints,
-      outdir: "pkg/dist-node",
-      bundle: true,
-      platform: "node",
-      target: "node14",
-      format: "cjs",
-      ...sharedOptions,
-    }),
-    // Build an ESM browser bundle
-    esbuild.build({
-      entryPoints,
-      outdir: "pkg/dist-web",
-      bundle: true,
-      platform: "browser",
-      format: "esm",
-      ...sharedOptions,
-    }),
-  ]);
+  await esbuild.build({
+    entryPoints,
+    outdir: "pkg/dist-bundle",
+    bundle: true,
+    platform: "neutral",
+    format: "esm",
+    ...sharedOptions,
+  });
 
   // Copy the README, LICENSE to the pkg folder
   await copyFile("LICENSE", "pkg/LICENSE");
@@ -74,10 +61,12 @@ 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: {
+          ".": {
+            types: "./dist-types/index.d.ts",
+            import: "./dist-bundle/index.js",
+          },
+        },
         sideEffects: false,
       },
       null,

src/fetch-wrapper.ts

@@ -39,7 +39,13 @@ export default function fetchWrapper(
   return fetch(requestOptions.url, {
     method: requestOptions.method,
     body: requestOptions.body,
-    headers: requestOptions.headers as HeadersInit,
+    // Header values must be `string`
+    headers: Object.fromEntries(
+      Object.entries(requestOptions.headers).map(([name, value]) => [
+        name,
+        String(value),
+      ]),
+    ),
     signal: requestOptions.request?.signal,
     // duplex must be set if request.body is ReadableStream or Async Iterables.
     // See https://fetch.spec.whatwg.org/#dom-requestinit-duplex.

test/request.test.ts

@@ -5,17 +5,21 @@ import { ReadableStream } from "node:stream/web";
 import { getUserAgent } from "universal-user-agent";
 import fetchMock from "fetch-mock";
 import { createAppAuth } from "@octokit/auth-app";
-import lolex from "lolex";
+import fakeTimers from "@sinonjs/fake-timers";
 import type {
   EndpointOptions,
   RequestInterface,
   ResponseHeaders,
 } from "@octokit/types";
 
 import { request } from "../src/index.ts";
+import { jest } from "@jest/globals";
 
 const userAgent = `octokit-request.js/0.0.0-development ${getUserAgent()}`;
-const stringToArrayBuffer = require("string-to-arraybuffer");
+const __filename = new URL(import.meta.url);
+function stringToArrayBuffer(str: string) {
+  return new TextEncoder().encode(str).buffer;
+}
 
 describe("request()", () => {
   it("is a function", () => {
@@ -69,7 +73,7 @@ describe("request()", () => {
   });
 
   it("README authentication example", async () => {
-    const clock = lolex.install({
+    const clock = fakeTimers.install({
       now: 0,
       toFake: ["Date"],
     });

test/tsconfig.test.json

@@ -3,7 +3,6 @@
   "compilerOptions": {
     "emitDeclarationOnly": false,
     "noEmit": true,
-    "verbatimModuleSyntax": false,
     "allowImportingTsExtensions": true
   },
   "include": ["src/**/*"]

tsconfig.json

@@ -1,6 +1,7 @@
 {
   "extends": "@octokit/tsconfig",
   "compilerOptions": {
+    "lib": ["dom", "DOM.Iterable", "es2023"],
     "esModuleInterop": true,
     "declaration": true,
     "outDir": "pkg/dist-types",