Strategies for resolving linter problems involving mixins in vue-typescript

Scenario:


I am currently working on a project where I am implementing mixins to engage with data from components and other methods. Despite the code functioning as expected, I am encountering errors in Vetur indicating that the method does not exist in the combined vue instance. This has led to linting errors in my project, causing concerns about the overall code quality. The complaints are also reflected in the ts-lint console, adding to the uncertainty surrounding the project.

Queries and Expectations

What is causing these errors and how can I resolve them? The recurring nature of these errors across components utilizing the same code is making the use of mixins for code reusability more complex than anticipated.

Specifics and Code Snippets

Vue Component Implementation with Mixin

export default Vue.extend({
  name: 'RecentRequests' as string,
  data() {
    return {
      requests: [] as Request[],
      workflows: [] as Workflow[],
      environment: `${process.env.VUE_WEB_API}`,
      search: '',
    }
  },
  async created() {
    await RequestService.getRequest().then((response) => {
      this.$data.requests = response.Data;
    }).catch((err) => {
      this.$data.requests = null;
      this.$data.topFive = null;
      this.$store.dispatch('updateErrorMessage', {message: `${err}`});
      this.$store.dispatch('updateError');
    });
    await WorkflowService.getWorkflow().then((response) => {
      this.$data.workflows = response.Data;
    }).catch((err) => {
      this.$data.requests = null;
      this.$data.topFive = null;
      this.$store.dispatch('updateErrorMessage', {message: `${err}`});
      this.$store.dispatch('updateError');
    });
  },
  mixins: [globalMixins],
  computed: {
    filteredRequests() {
      let searchTerm = this.search.toLowerCase();
      let topFive: any = this.topFive()
      if(this.search === null || this.search === '') {
        return topFive
      } else {
        return topFive.filter((item: any) => {
            return item.WorkflowDisplayName.toLowerCase().includes(searchTerm);
        });
      }
    }
  },
  methods: {
    topFiveRequests() {
      // combine workflows first before running
      this.combineRequestsAndWorkflows(this.$data.requests, this.$data.workflows);
      // make copy of requests array
      const requestsCopy = this.$data.requests.map((x: Request) => x);
      // sort array by most recent
      const mostRecentRequests = requestsCopy.sort((a: any, b: any) => {
        const dateA: any = new Date(a.timeRequested);
        const dateB: any = new Date(b.timeRequested);
        return dateB - dateA;
      });
      const result = mostRecentRequests.splice(0, 4);
      return result;
    },
  },
})
</script>

Error Highlighted by Vetur

https://i.sstatic.net/xnxGE.png

Error Indicated by tsLint in the Console

https://i.sstatic.net/dH34R.png

I

Answer №1

Typescript can be a bit limited in recognizing mixins in Vue. You have a couple of options to work around this:

  1. If a component has a single mixin, instead of using Vue.extend, try using YourMixin.extend since mixin extends Vue. Keep in mind that this solution is only applicable for a single mixin.
  2. If there are multiple mixins in a component, you may want to look into this dependency.

For more information, check out the discussion on the forum.

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