Type alias Writable<T>

Returns a writable type version of type.

USAGE: Given:

interface Person {readonly name: string}
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We would like to get a read/write version of Person.

const WritablePerson = Writable<Person>;
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The result is that you can do:

const readonlyPerson: Person = {name: 'Marry'};
readonlyPerson.name = 'John'; // TypeError
(readonlyPerson as WritablePerson).name = 'John'; // OK

// Error: Correctly detects that `Person` did not have `age` property.
(readonlyPerson as WritablePerson).age = 30;
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