fix(cli): include ajv in devDependencies for Expo Router and npm (#2842…

… by @coolsoftwaretyler)

* fix(cli): include ajv in devDependencies for Expo Router and npm

* fix(cli): specify ajv devDependency, but only when necessary

src/commands/new.ts

@@ -750,6 +750,11 @@ module.exports = {
         // do base install
         const installCmd = packager.installCmd({ packagerName })
         await system.run(installCmd, { onProgress: log })
+        // If they chose npm and also Expo Router, we need to run npm install ajv@^8 --legacy-peer-deps.
+        // see https://github.com/infinitered/ignite/issues/2840
+        if (packagerName === "npm" && experimentalExpoRouter) {
+          await system.run(`npm install ajv@^8 --legacy-peer-deps`, { onProgress: log })
+        }
         // now that expo is installed, we can run their install --fix for best Expo SDK compatibility
         const forwardOptions = packagerName === "npm" ? " -- --legacy-peer-deps" : ""
         await system.run(`npx expo install --fix${forwardOptions}`, { onProgress: log })