Accessing class fields from within an annotation in Typescript

Upon using the code snippet below:

@Component({
    props: {
        value: String
    },
    mounted() {
        //Do something with `bar`
        this.bar = this.bar + " is now mounted";
    }
})
export default class Foo extends Vue {
     private bar : string = "This element";
}

An error appears in the TypeScript console, while the code executes without issues.

37:14 Property 'bar' does not exist on type 'Vue'.
    05 |    mounted() {
    06 |        //Do something with `bar`
    07 |        this.bar = this.bar + " is now mounted";
       |             ^
    08 |    }
    09 | })

Answer №1

In order for the compiler to recognize the existence of this.bar, you must specify a type-parameter within the Component annotation when defining the class.

@Component<Bar>({
    props: {
        value: Number
    },
    mounted() {
        //Perform operations on `bar`
        this.bar = this.bar + " is now ready";
    }
})
export default class Bar extends Vue {
     private bar : string = "This item";
}

The provided code compiles without any issues.

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