fix(types): publish protocol types to npm (#5174)

Co-Authored-By: Mathias Bynens <mathias@qiwi.be>

.npmignore

@@ -8,8 +8,8 @@ node6
 test
 utils/node6-transform
 
-# exclude internal type definition files
-/lib/*.d.ts
+# exclude internal type definitions
+/lib/externs.d.ts
 
 # repeats from .gitignore
 node_modules

CONTRIBUTING.md

@@ -252,8 +252,9 @@ Releasing to npm consists of the following phases:
     1. On your local machine, pull from [upstream](https://github.com/GoogleChrome/puppeteer) and make sure the last commit is the one just merged.
     2. Run `git status` and make sure there are no untracked files.
         - **WHY**: this is to avoid adding unnecessary files to the npm package.
-    3. Run [`npx pkgfiles`](https://www.npmjs.com/package/pkgfiles) to make sure you don't publish anything unnecessary.
-    4. Run `npm publish`. This publishes the `puppeteer` package.
+    3. Run `npm install` to make sure the latest `lib/protocol.d.ts` is generated.
+    4. Run [`npx pkgfiles`](https://www.npmjs.com/package/pkgfiles) to make sure you don't publish anything unnecessary.
+    5. Run `npm publish`. This publishes the `puppeteer` package.
 3. Publish `puppeteer-core` to npm.
     1. Run `./utils/prepare_puppeteer_core.js`. The script changes the name inside `package.json` to `puppeteer-core`.
     2. Run `npm publish`. This publishes the `puppeteer-core` package.

utils/protocol-types-generator/index.js

@@ -69,8 +69,8 @@ declare global {
     }
   }
 }
-// empty export to keep file a module
-export {}
+
+export default Protocol;
 `;
   const outputPath = path.join(__dirname, '..', '..', 'lib', 'protocol.d.ts');
   require('fs').writeFileSync(outputPath, output);