also typecheck and lint prs (codesandbox#3164)

Author: christianalfoni

testpr-script.js

@@ -48,6 +48,8 @@ async function test(prId) {
     .then(() => spawnPromise('git', ['merge', 'master']))
     .then(() => spawnPromise('yarn', ['install']))
     .then(() => spawnPromise('yarn', ['build:deps']))
+    .then(() => spawnPromise('yarn', ['typecheck']))
+    .then(() => spawnPromise('yarn', ['lint']))
     .catch(() => {
       console.error(
         'Something wrong happened building the deps, maybe missing a new package added. Please install and run build:deps manually before continuing'