feat(puppeteer): export esm modules in package.json

Signed-off-by: Randolf Jung <jrandolf@chromium.org>

package.esm.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

package.json

@@ -2,7 +2,12 @@
   "name": "puppeteer",
   "version": "13.2.0",
   "description": "A high-level API to control headless Chrome over the DevTools Protocol",
+  "type": "commonjs",
   "main": "./cjs-entry.js",
+  "exports": {
+    "import": "./lib/esm/puppeteer/node.js",
+    "require": "./cjs-entry.js"
+  },
   "types": "lib/types.d.ts",
   "repository": "github:puppeteer/puppeteer",
   "engines": {
@@ -29,7 +34,7 @@
     "lint": "npm run eslint && npm run build && npm run doc && npm run markdownlint",
     "doc": "node utils/doclint/cli.js",
     "clean-lib": "rimraf lib",
-    "build": "npm run tsc && npm run generate-d-ts",
+    "build": "npm run tsc && npm run generate-d-ts && npm run generate-pkg-json",
     "tsc": "npm run clean-lib && tsc --version && npm run tsc-cjs && npm run tsc-esm",
     "tsc-cjs": "tsc -b src/tsconfig.cjs.json",
     "tsc-esm": "tsc -b src/tsconfig.esm.json",
@@ -38,6 +43,7 @@
     "clean-docs": "rimraf website/docs && rimraf docs-api-json",
     "generate-d-ts": "npm run clean-docs && api-extractor run --local --verbose",
     "generate-docs": "npm run generate-d-ts && api-documenter markdown -i docs-api-json -o website/docs && node utils/remove-tag.js",
+    "generate-pkg-json": "cp package.esm.json lib/esm/package.json",
     "ensure-correct-devtools-protocol-revision": "ts-node -s scripts/ensure-correct-devtools-protocol-package",
     "ensure-pinned-deps": "ts-node -s scripts/ensure-pinned-deps",
     "test-types-file": "ts-node -s scripts/test-ts-definition-files.ts",

src/common/Debug.ts

@@ -55,7 +55,9 @@ import { isNode } from '../environment.js';
 export const debug = (prefix: string): ((...args: unknown[]) => void) => {
   if (isNode) {
     // eslint-disable-next-line @typescript-eslint/no-var-requires
-    return require('debug')(prefix);
+    return async (...logArgs: unknown[]) => {
+      (await import('debug')).default(prefix)(logArgs);
+    };
   }
 
   return (...logArgs: unknown[]): void => {

src/initialize-node.ts

@@ -20,7 +20,7 @@ import pkgDir from 'pkg-dir';
 import { Product } from './common/Product.js';
 
 export const initializePuppeteerNode = (packageName: string): PuppeteerNode => {
-  const puppeteerRootDirectory = pkgDir.sync(__dirname);
+  const puppeteerRootDirectory = pkgDir.sync(process.cwd());
 
   let preferredRevision = PUPPETEER_REVISIONS.chromium;
   const isPuppeteerCore = packageName === 'puppeteer-core';