build(package): generate esm output with exports

package.json

@@ -5,13 +5,33 @@
   "license": "Apache-2.0",
   "description": "Google APIs Client Library for Node.js",
   "main": "./build/cjs/src/index.js",
-  "types": "./build/cjs/src/index.d.ts",
+  "module": "./build/esm/src/index.mjs",
+  "types": "./build/esm/src/index.d.ts",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": {
+        "types": "./build/esm/src/index.d.ts",
+        "default": "./build/esm/src/index.mjs"
+      },
+      "require": {
+        "types": "./build/cjs/src/index.d.ts",
+        "default": "./build/cjs/src/index.js"
+      },
+      "default": {
+        "types": "./build/esm/src/index.d.ts",
+        "default": "./build/esm/src/index.mjs"
+      }
+    }
+  },
   "engines": {
     "node": ">=14.0.0"
   },
   "files": [
     "build/cjs/src",
-    "!build/cjs/src/**/*.map"
+    "!build/cjs/src/**/*.map",
+    "build/esm/src",
+    "!build/esm/src/**/*.map"
   ],
   "scripts": {
     "pretest": "npm run build-test",
@@ -28,7 +48,7 @@
     "samples-test": "cd samples && npm install && npm link ../ && pwd && npm test",
     "lint": "gts check",
     "precompile": "rimraf build",
-    "compile": "cross-env NODE_OPTIONS=--max-old-space-size=8192 tsc -p tsconfig.json",
+    "compile": "cross-env NODE_OPTIONS=--max-old-space-size=8192 tsc-multi --verbose",
     "prebuild-test": "rimraf build",
     "build-test": "cross-env NODE_OPTIONS=--max-old-space-size=8192 tsc -p tsconfig.test.json",
     "build-tools": "tsc -p tsconfig.tools.json",
@@ -93,6 +113,7 @@
     "server-destroy": "^1.0.1",
     "sinon": "^15.0.0",
     "tmp": "^0.2.0",
+    "tsc-multi": "^1.1.0",
     "typescript": "5.1.6",
     "yargs-parser": "^20.2.0"
   }

src/generator/docs.ts

@@ -12,12 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import * as execa from 'execa';
 import * as fs from 'fs';
 import * as nunjucks from 'nunjucks';
 import * as path from 'path';
 import {promisify} from 'util';
 import Q from 'p-queue';
+const execa: typeof import('execa') = require('execa');
 
 const srcPath = path.join(__dirname, '../../../../src');
 const apiPath = path.join(srcPath, 'apis');

src/generator/download.ts

@@ -12,14 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import * as minimist from 'yargs-parser';
 import * as path from 'path';
 import * as fs from 'fs';
 const {mkdir} = require('fs').promises;
 import Q from 'p-queue';
 import {request, Headers} from 'gaxios';
 import * as gapi from 'googleapis-common';
 
+const minimist: typeof import('yargs-parser') = require('yargs-parser');
+
 export type Schema = {[index: string]: {}};
 export const DISCOVERY_URL = 'https://www.googleapis.com/discovery/v1/apis/';
 

src/generator/generator.ts

@@ -20,14 +20,15 @@ import * as path from 'path';
 import * as util from 'util';
 import Q from 'p-queue';
 import * as prettier from 'prettier';
-import * as minimist from 'yargs-parser';
 import {GaxiosError, request} from 'gaxios';
 import {DISCOVERY_URL} from './download';
 import {downloadDiscoveryDocs, ChangeSet} from './download';
 import * as filters from './filters';
 import {addFragments} from './samplegen';
 import {Disclaimer} from './disclaimer';
 
+const minimist: typeof import('yargs-parser') = require('yargs-parser');
+
 const writeFile = util.promisify(fs.writeFile);
 const readDir = util.promisify(fs.readdir);
 const readFile = util.promisify(fs.readFile);

src/generator/synth.ts

@@ -11,13 +11,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import * as execa from 'execa';
 import * as path from 'path';
 import * as fs from 'fs';
 import * as gaxios from 'gaxios';
-import * as minimist from 'yargs-parser';
 import {Generator} from './generator';
 import {DISCOVERY_URL, ChangeSet} from './download';
+const execa: typeof import('execa') = require('execa');
+const minimist: typeof import('yargs-parser') = require('yargs-parser');
 
 export enum Semverity {
   PATCH = 1,

test/test.clients.ts

@@ -220,5 +220,5 @@ describe('Clients', () => {
 
   it('should pass eslint for a given client', () => {
     execSync('npx eslint --no-ignore src/apis/youtube/*.ts');
-  });
+  }).timeout(50000);
 });

tsc-multi.json

@@ -0,0 +1,24 @@
+{
+  "targets": [
+    {
+      "extname": ".js",
+      "module": "commonjs",
+      "outDir": "build/cjs",
+      "tsBuildInfoFile": "build/cjs.tsbuildinfo"
+    },
+    {
+      "extname": ".mjs",
+      "module": "ES2022",
+      "outDir": "build/esm",
+      "moduleResolution": "NodeNext",
+      "tsBuildInfoFile": "build/esm.tsbuildinfo",
+      "include": [
+        "src/*.ts",
+        "src/**/*.ts"
+      ]
+    }
+  ],
+  "projects": [
+    "tsconfig.json"
+  ]
+}