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//// [promiseChaining1.ts]
// same example but with constraints on each type parameter
class Chain2<T extends { length: number }> {
constructor(public value: T) { }
then<S extends Function>(cb: (x: T) => S): Chain2<S> {
var result = cb(this.value);
// should get a fresh type parameter which each then call
var z = this.then(x => result)/*S*/.then(x => "abc")/*Function*/.then(x => x.length)/*number*/; // Should error on "abc" because it is not a Function
return new Chain2(result);
}
}
//// [promiseChaining1.js]
// same example but with constraints on each type parameter
var Chain2 = /** @class */ (function () {
function Chain2(value) {
this.value = value;
}
Chain2.prototype.then = function (cb) {
var result = cb(this.value);
// should get a fresh type parameter which each then call
var z = this.then(function (x) { return result; }) /*S*/.then(function (x) { return "abc"; }) /*Function*/.then(function (x) { return x.length; }) /*number*/; // Should error on "abc" because it is not a Function
return new Chain2(result);
};
return Chain2;
}());
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