I need to declare a variable:
Id: string | string[] | undefined;
But I'm facing an error
TS2304: Cannot find name 'undefined'.
Even though Basic Types states that undefined is a valid type in TypeScript.
Advanced Types explores union types like number | undefined.
What could be the issue with my union type declaration?
Introduced in TypeScript 2.0, the undefined type, along with the null type, were newly added. If you're encountering this issue, it's likely that you're working with an outdated version of TypeScript.
Give this a shot
Id: string | string[] | 'undefined';
Alternatively, the any data type can be utilized.
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