Failed to mount component: template or render function not defined. (found in root instance)

Vue.jsを使っていてエラーが出たのでメモ

[Vue warn]: Failed to mount component: template or render function not defined. (found in root instance)

このページに書いてあるようにwebpackの設定でresolveを追加 vuejs.org

上記エラーを解決したら以下のエラーが発生

[Vue warn]: It seems you are using the standalone build of Vue.js in an environment with Content Security Policy that prohibits unsafe-eval. The template compiler cannot work in this environment. Consider relaxing the policy to allow unsafe-eval or pre-compiling your templates into render functions.

Chrome Extension開発なのでCSP対応が必要になる

npm i vue@csp

で入れ直して解決