I'm attempting to define a property that can be either a lambda function or a string in TypeScript.
class TestClass {
name: string | () => string;
}
You can find a sample of non-working code on the TS playground here.
However, when compiling, the TS compiler throws an error saying:
"[ts] Member 'string' implicitly has an 'any' type."Could it be that the type is declared incorrectly? Or are there any workarounds for this issue?
To solve this issue, simply add another pair of parentheses.
class ExampleClass {
title: string | (() => string);
}
If you omit the additional set of parentheses, the compiler will interpret it as (string | ()) => string due to precedence rules.
It was pointed out by Titian that utilizing parentheses is necessary.
class TimePeriod {
name: string | (() => string);
}
Another method involves creating a type alias:
type ATypeName = () => string;
class TimePeriod {
name: string | ATypeName;
}
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