Function property vs method

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There is another difference, in that the readonly modifier cannot be applied to methods. Therefore, the following assignment cannot be prevented:

interface Foo {
    bar(): void;
}

declare var x: Foo;
x.bar = function () { };

If bar is defined as a property, then the readonly modifier can be applied to it:

interface Foo {
    readonly bar: () => void;
}

preventing reassignment.

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