Problem

According to:

>https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/toSpliced

the method .toSpliced() is now available in all major JS platforms. But as you can see here:

>https://www.typescriptlang.org/play?ts=5.3.0-beta#code/MYewdgzgLgBAhgJwTAvDA2gcgB6YDQyYCe+hAXpgLoCwAUKJLIggEyrxIB0UIAygA4AbAJbAApgBMAFAEYCMgJQwA9Mow5SmCjVpA

Even with TS 5.3.0-beta its type is not defined in TypeScript.

Solution

To use toSpliced, you need to set >target to ESNext (for now, until there's an ES2023 setting). Your playground targets ES2017, which wouldn't support toSpliced or anything else from ES2018 onward. You also need to be using a fairly recent version of TypeScript (for instance, >5.1.6 doesn't support it, but >5.2.2 does; I don't know precisely where in there it was added).

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