What is the solution to resolving the type error for the Ref() function in Vue.js composition API?

Using the Vue composition API, I encountered an issue with TypeScript regarding a ref for an array of objects. Each object in the array has a value property, but TypeScript seems to be confusing the ref's value with the property value inside each array.

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

The screenshot above illustrates how TypeScript recognizes that the type of 'arr' is an array of objects containing 'name' and 'value', but when using ref, it incorrectly detects the type. Even attempts to use 'as' conversion do not resolve the problem:

const arr2 = ref(arr as { name: string; value: number }[]);

However, changing the 'value' property to something else, such as 'value2', can make it work: https://i.sstatic.net/CCcq6.png

Update:

Today, I encountered another issue as shown below:

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

I am looking for a solution to this type error. How should I proceed?

typescriptvue.jsvuejs2typeerrorvue-composition-api

Answer №1

Unfortunately, the use of an image to display your code means I have to manually input it once more.

It appears that specifying 'value' as a key in your object is causing confusion for Typescript. One workaround is to define an interface and then utilize it for declaring arr2 as well.

    interface item {
        name: string,
        value: number
    };

    const arr: item[] = [
        {name: "y1", value: 3},
        {name: "y2", value: 4}
    ];

    const arr2: Ref<item[]> = ref(arr);

    arr2.value.forEach(element => console.log(element.name + ':' + element.value));

However, the most effective solution would be avoiding using 'value' as a key in your objects altogether, as it might be a reserved term in Javascript and/or Typescript.

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