//// [targetTypeBaseCalls.ts] function foo(x: (s: string) => void) { } class Foo { constructor(x: (s: string) => void){} } foo(function(s) { s = 5 }); // Error, can’t assign number to string new Foo(function(s) { s = 5 }); // error, if types are applied correctly class Bar extends Foo { constructor() { super(function(s) { s = 5 }) } } // error, if types are applied correctly //// [targetTypeBaseCalls.js] var __extends = (this && this.__extends) || function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; function __() { this.constructor = d; } d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __()); }; function foo(x) { } var Foo = (function () { function Foo(x) { } return Foo; })(); foo(function (s) { s = 5; }); // Error, can’t assign number to string new Foo(function (s) { s = 5; }); // error, if types are applied correctly var Bar = (function (_super) { __extends(Bar, _super); function Bar() { _super.call(this, function (s) { s = 5; }); } return Bar; })(Foo); // error, if types are applied correctly