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interface Foo {
method(a: number): string;
optionalMethod?(a: number): string;
property: string;
optionalProperty?: string;
}
class Foo {
additionalProperty: string;
additionalMethod(a: number): string {
return this.method(0);
}
}
class Bar extends Foo {
method(a: number) {
return this.optionalProperty;
}
}
var bar = new Bar();
bar.method(0);
bar.optionalMethod(1);
bar.property;
bar.optionalProperty;
bar.additionalProperty;
bar.additionalMethod(2);
var obj: {
method(a: number): string;
property: string;
additionalProperty: string;
additionalMethod(a: number): string;
};
bar = obj;
obj = bar;
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