Ensure your Vue components have type-checked props at compile time when using TypeScript

I have encountered an issue while using Vue.js with Typescript. The code I am working with is pretty straightforward, utilizing vue-class-component and vue-property-decorator.

<script lang="ts">
    import { Component, Prop, Vue } from 'vue-property-decorator';

    @Component
    export default class Child extends Vue {
        @Prop(String) private value!: string;
    }
</script>

When passing a string as props to the Child component, everything works seamlessly without any warnings or errors. However, when attempting to pass a number, a warning appears during runtime like the one shown in the image below:

https://i.sstatic.net/I2kj8.jpg

Interestingly, there are no compilation errors. Is there a way to perform type checks at "COMPILE" time to catch such issues beforehand?

Answer №1

Converting a comment to an answer...

In my previous experience with a similar issue, it was due to the way Vue handles passing properties to components from templates. If you use value="1", a string is passed; but if you use :value="1", then a number is passed instead. This can be confusing and may only become apparent during runtime since the template is not compiled until then.

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