TypeScript

interface Shape {color: string; }interface Square extends Shape {sideLength: number; }let square = <Square>{}; square.color = "blue"; square.sideLength = 10;

對應生成的JavaScript：

var square = {}; square.color = "blue"; square.sideLength = 10;

TypeScript

interface Shape {color: string; }interface PenStroke {penWidth: number; }interface Square extends Shape, PenStroke {sideLength: number; }let square = <Square>{}; square.color = "blue"; square.sideLength = 10; square.penWidth = 5.0;

對應的JavaScript代碼：

var square = {}; square.color = "blue"; square.sideLength = 10; square.penWidth = 5.0;

extends ___ = ___ syntax in typescript

export interface ActionReducer<T, V extends Action = Action> {(state: T | undefined, action: V): T; }

It specifies the default type of V . so V can be either a class which extends Action or if not mentioned will be of type Action.

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