Getting ready to make v9 prereleases (#4751)

* publish as v9 prerelease

* use beta tag

Author: Feiyang1

packages-exp/firebase-exp/package.json

@@ -1,6 +1,6 @@
 {
   "name": "firebase-exp",
-  "version": "0.900.25",
+  "version": "9.0.0-beta.0",
   "private": true,
   "description": "Firebase JavaScript library for web and Node.js",
   "author": "Firebase <[email protected]> (https://firebase.google.com/)",

scripts/exp/release.ts

@@ -358,9 +358,9 @@ async function getNewVersions(packagePaths: string[]) {
   for (const path of packagePaths) {
     const { version, name } = await readPackageJson(path);
 
-    // increment firebase-exp's patch version
+    // increment firebase-exp as a v9 prerelease, e.g. 9.0.0-beta.0 -> 9.0.0-beta.1
     if (name === FIREBASE_UMBRELLA_PACKAGE_NAME) {
-      const nextVersion = inc(version, 'patch');
+      const nextVersion = inc(version, 'prerelease');
       versions.set(name, nextVersion);
     } else {
       // create individual packages version
@@ -394,7 +394,7 @@ async function publishToNpm(packagePaths: string[], dryRun = false) {
 }
 
 async function publishPackage(packagePath: string, dryRun: boolean) {
-  const args = ['publish', '--access', 'public', '--tag', 'exp'];
+  const args = ['publish', '--access', 'public', '--tag', 'beta'];
   if (dryRun) {
     args.push('--dry-run');
   }