Property ‘$router’ does not exist on type

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In TypeScript, the error message “property ‘$router’ does not exist on type” typically occurs when you try to access the ‘$router’ property on an object that doesn’t have this property defined. This error is commonly observed in frameworks like Vue.js, where the ‘$router’ property is used for routing purposes.

To understand this error better, let’s consider an example with Vue.js. Suppose you have a Vue component named ‘MyComponent’ that tries to access the ‘$router’ property: 

    
      export default {
        data() {
          return {
            message: 'Hello World!'
          }
        },
        mounted() {
          this.$router.push('/dashboard');
        }
      }

In the code above, we are trying to use the ‘$router’ property to navigate to the ‘/dashboard’ route. However, if the component is not within the Vue router, this property won’t be available, leading to the error.

To fix this error, you need to ensure that your component is properly set up within the Vue router. This can be done by checking if the component is indeed registered within a router-view or by wrapping the component with a <router-view> tag in the root Vue instance.

Here’s an example of how your main Vue instance could be set up to avoid the error: 

    
      import Vue from 'vue'
      import VueRouter from 'vue-router'
      
      Vue.use(VueRouter)
      
      const routes = [
        { path: '/dashboard', component: Dashboard }
        // Other routes...
      ]
      
      const router = new VueRouter({
        routes
      })
      
      new Vue({
        router,
        render: h => h(App)
      }).$mount('#app')

By properly setting up the Vue router and registering your component within the router, the ‘$router’ property will now be available for use in your component without causing the aforementioned error.

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