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Suggestion: Extension methods #9

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Description

Allow a declarative way of adding members to an existing type's prototype

Example:

class Shape {
 // ...
}

/* ...elsewhere...*/
extension class Shape { // Syntax??
    getArea() { return /* ... */; }
}

var x = new Shape();
console.log(x.getArea()); // OK
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    Out of ScopeThis idea sits outside of the TypeScript language design constraintsSuggestionAn idea for TypeScript

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