"Cannot read property 'vue' of undefined" when there's no "dependencies" in package.json

[scrollbar-ww]

• I have searched through existing issues
• I have read through docs
• I have read FAQ
• I have tried restarting VS Code or running Vetur: Restart VLS

Info

• Platform:
• Vetur version: 0.31.3
• VS Code version: 1.52.1

Source

"vueVersion.ts":

export function inferVueVersion(packagePath: string | undefined): VueVersion {
  const packageJSONPath = packagePath;
  try {
    if (!packageJSONPath) {
      throw new Error(`Can't find package.json in project`);
    }
    const packageJSON = packageJSONPath && JSON.parse(readFileSync(packageJSONPath, { encoding: 'utf-8' }));
    const vueDependencyVersion = packageJSON.dependencies.vue || packageJSON.devDependencies.vue;
`

[yoyo930021]

We need to infer vue version for some features.

[scrollbar-ww]

some component lib doesn't have "dependencies", all external dependencies are in "devDependencies"。
so，it's a little earlier to throw the error.
you should wrote like this:
const vueDependencyVersion = packageJSON.dependencies?.vue || packageJSON.devDependencies?.vue;
if got undefined, throw error.

[yoyo930021]

Thanks @scrollbar-ww.
Nice catch.