Why @ vue/typescript, it will error checking my vue script without ts lang

[Binote]

When I use js components in a TS project, why check the JS script in a VUE file

comp.vue

<script>
export default {
// Missing return type on function. eslint(@typescript-eslint/explicit-module-boundary-types)
  data(){}
}
</script>

.eslintrc.js

module.exports = {
    root: true,
    env: {
        node: true,
    },
    "plugins": ["@typescript-eslint"],
    extends: [
        '@vue/typescript/recommended',
    ],
    parserOptions: {
        parser: '@typescript-eslint/parser',
        ecmaVersion: 2020,
    },
};

[koooge]

https://github.com/vuejs/vue-eslint-parser/issues/49

[SlyDave]

49 was closed in #116 but doesn't fix the issue expressed here.

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