Error in Vue.js 2 Composition API: Trying to access 'length' property of undefined object

Greetings to the Vue.js user community! I'm facing a challenging issue that I can't seem to resolve:

  • I am currently using Vue.js 2.x on Windows 11. Whenever I run yarn install or npm install, I encounter an error as displayed in the console.

View image description here

[Vue warn]: Error in setup: "TypeError: Cannot read properties of undefined (reading 'length')"

My project utilizes vue/composition-api version 1.4.0, and even after updating to version 1.7.0, the same error persists without any resolution.

Here is an excerpt from my package.json file:

{
  "name": "vuexy-vuejs-react-html-laravel-admin-dashboard-template",
  /* Additional content from package.json file omited for brevity */
}

Any assistance or guidance would be greatly appreciated!

javascriptvue.jsvuejs2vue-composition-api

Answer №1

The error mentioned above occurs due to a conflict between the versions of "vue" and "@vue/composition-api". Since "@vue/composition-api": "^1.4.0" only supports "vue" version: "2.6.14" and below, we need to limit its version accordingly.


To resolve this issue, I followed these steps:


Step 1: Deleted the node_modules folder and package-lock.json file.


Step 2: Edited the package.json file by changing "vue": "2.x" to "vue": "2.6.x", and editing "vue-template-compiler": "2.x" to "vue-template-compiler": "2.6.x" under dependencies.


Step 3: Ran npm install in the terminal of the project directory followed by npm run serve to observe the result.


I hope this solution proves helpful.

Answer №2

The issue does not lie within the composition API itself, but rather in your code. It appears that you may be attempting to retrieve the length of an undefined array. Check the console for error messages and investigate by clicking on the location indicated to pinpoint the source of the error.

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