The example from the docs:

import {memoizeDecorator} from 'memoize';

class Example {
	index = 0

	@memoizeDecorator()
	counter() {
		return ++this.index;
	}
}

returns the following error in TypeScript 5:

Unable to resolve signature of method decorator when called as an expression.
  The runtime will invoke the decorator with 2 arguments, but the decorator expects 3. ts(1241)
index.d.ts(109, 183): An argument for 'descriptor' was not provided.

The cause of this issue, I assume, is that the library only supports the stage 2 implementation of decorators. TypeScript 5 supports stage 3 decorator implementation without --experimentalDecorators, see https://devblogs.microsoft.com/typescript/announcing-typescript-5-0/#decorators.