[vue] Parsing error: ImportDeclaration should appear when the mode is ES6 and in the module context 해결하기

Parsing error: ImportDeclaration should appear when the mode is ES6 and in the module context

	"parserOptions": {
        "ecmaVersion": 12,
        "sourceType": "module"
    },

latest였던 ecmaVersion을 12로 변경해서 해결했다.