Encountering the error message `[Vue warn]: The component failed to mount: template or render function not defined` occurs when attempting to import a file without the .vue extension

I'm facing an issue where I am unable to import components from a Vue file without having to append the .vue extension.

In my project, which is a Vue project with TypeScript and a class-based setup, I have separated the script and template files (.ts and .vue files).

For example: import DashboardCard from "@/components/dashboard_card/DashboardCard";

When I try to import the component without the .vue extension,

[Vue warn]: Failed to mount component: template or render function not defined.

This error disappears when I include all components with the .vue extension. While this wouldn't be a problem if it were a new project, I am encountering this issue in an already existing large project. I suspect it has something to do with resolving extensions (in vue.config.js - resolve [.vue]). I'm struggling to understand the differences between vue.config.js and webpack.config.js.

My vue.config.js configuration looks like this:

module.exports = {
  transpileDependencies: [
    "vuex-module-decorators",
  ],
  chainWebpack: config => {
    config.module
        .rule('po')
        .test(/\.vue$/)
        .use('vue')
        .loader('vue-loader')
        .options({
          esModule: false,
        })
  }
}

My babel.config.js configuration is as follows:

module.exports = {
  presets: [
    '@vue/app'
  ]
}

My tsconfig.json configuration appears as below:

{
  "compilerOptions": {
    "target": "esnext",
    "module": "esnext",
    "strict": true,
    "jsx": "preserve",
    "importHelpers": true,
    "moduleResolution": "node",
    "experimentalDecorators": true,
    "esModuleInterop": true,
    "noImplicitThis": true,
    "noImplicitAny": true,
    "strictPropertyInitialization": true,
    "allowSyntheticDefaultImports": true,
    "strictNullChecks": true,
    "sourceMap": true,
    "baseUrl": ".",
    "types": [
      "webpack-env",
      "mocha",
      "node",
      "chai"
    ],
    "paths": {
      "@/*": [
        "src/*"
      ]
    },
    "lib": [
      "esnext",
      "dom",
      "dom.iterable",
      "scripthost"
    ]
  },
  "include": [
    "src/**/*.ts",
    "src/**/*.tsx",
    "src/**/*.vue",
    "tests/**/*.ts",
    "tests/**/*.tsx"
  ],
  "exclude": [
    "node_modules"
  ],
  "files": ["./src/shims-vue.d.ts"]
}

My package.json includes the following dependencies and devDependencies configurations.

{Insert your package.json content here}

I would greatly appreciate any guidance on how to solve this particular issue.

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