//// [objectLiteralContextualTyping.ts] // In a contextually typed object literal, each property value expression is contextually typed by // the type of the property with a matching name in the contextual type, if any, or otherwise // for a numerically named property, the numeric index type of the contextual type, if any, or otherwise // the string index type of the contextual type, if any. interface Item { name: string; description?: string; } declare function foo(item: Item): string; declare function foo(item: any): number; var x = foo({ name: "Sprocket" }); var x: string; var y = foo({ name: "Sprocket", description: "Bumpy wheel" }); var y: string; var z = foo({ name: "Sprocket", description: false }); var z: number; var w = foo({ a: 10 }); var w: number; declare function bar(param: { x?: T }): T; var b = bar({}); var b: {}; //// [objectLiteralContextualTyping.js] // In a contextually typed object literal, each property value expression is contextually typed by // the type of the property with a matching name in the contextual type, if any, or otherwise // for a numerically named property, the numeric index type of the contextual type, if any, or otherwise // the string index type of the contextual type, if any. var x = foo({ name: "Sprocket" }); var x; var y = foo({ name: "Sprocket", description: "Bumpy wheel" }); var y; var z = foo({ name: "Sprocket", description: false }); var z; var w = foo({ a: 10 }); var w; var b = bar({}); var b;