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TypeScript · Classes and modules

abstract class

A base class that cannot be instantiated and may declare abstract members subclasses must implement.

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Syntax
abstract class Shape

Example

Example
abstract class Shape {
  abstract area(): number;
}
class Square extends Shape {
  constructor(private size: number) { super(); }
  area() { return this.size ** 2; }
}

More in this group

Access modifiers Class Declaration file implements Namespace import readonly field Type-only import

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