interface IConverter {
convert(value: number): string
}
class Converter implements IConverter {
convert(): string { // no error?
return '';
}
}
const v1: IConverter = new Converter();
const v2: Converter = new Converter();
v1.convert(); // error, convert has parameter, although Converter's convert doesn't expect one
v2.convert(); // ok, convert has no parameters, although Converter implements IConverter which should have a parameter
Converter is supposed to implement IConverter, which includes a method that expects one parameter. However, in the definition of Converter, this parameter is missing. It is intriguing why TypeScript compiler does not flag this discrepancy as an error when implementing interfaces.