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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Suggestion: abstract classes","articleBody":"Support an `abstract` keyword for classes and their methods\n\nExamples:\n\n``` TypeScript\nabstract class Base {\n    abstract getThing(): string;\n    getOtherThing() { return 'hello'; }\n}\nvar x = new Base(); // Error, 'Base' is abstract\n\n// Error, must either be 'abstract' or implement concrete 'getThing'\nclass Derived1 extends Base { }\n\nclass Derived2 extends Base {\n    getThing() { return 'hello'; }\n    foo() { super.getThing(); } // Error: cannot invoke abstract members through 'super'\n}\nvar x = new Derived2(); // OK\nvar y: Base = new Derived2(); // Also OK\ny.getThing(); // OK\ny.getOtherThing(); // OK\n\nabstract class Empty { } // OK\n```\n","author":{"url":"https://github.com/RyanCavanaugh","@type":"Person","name":"RyanCavanaugh"},"datePublished":"2014-07-15T16:45:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":50},"url":"https://github.com/6/TypeScript/issues/6"}