Error TS2532: The item may be undefined when using the array.map() method

Despite understanding that this TypeScript error is just a warning, I haven't been able to resolve it when it appears on the .map method.

const files = require.context("./", true, /\.vue$/i);
files.keys().map(key =>
    Vue.component(
        key
            .split("/")
            .pop()
            .split(".")[0],
        files(key).default
    )
);

Even after attempting to check if the value of key exists before proceeding further, the same error persists.

TS2532: Object is possibly 'undefined'.

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

javascripttypescriptvue.js

Answer №1

When trying to split a string, it's important to be mindful of the return value. Using someString.split("/") will result in an array being returned. The method pop() may return the last element of the array or undefined (as stated on MDN).

This means that at this point in your code, you are dealing with: string | undefined. Executing .split(..) on an undefined value can lead to issues. TypeScript is warning you about this potential problem.

To address this issue and ensure type safety, consider utilizing TypeScript 3.7.0's optional chaining feature:

key.split("/").pop()?.split(".")[0] ?? someDefaultString

Another approach would be to encapsulate this logic in a separate function:

function extractValue(key: string): string {
    return key.split("/").pop()?.split(".")[0] ?? "defaultValue";
}

You can then use this function like so:

Vue.component(extractValue(key), files(key).default)

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