81 lines
1.2 KiB
TypeScript
81 lines
1.2 KiB
TypeScript
//// [narrowingOfDottedNames.ts]
|
|
// Repro from #8383
|
|
|
|
class A {
|
|
prop: { a: string; };
|
|
}
|
|
|
|
class B {
|
|
prop: { b: string; }
|
|
}
|
|
|
|
function isA(x: any): x is A {
|
|
return x instanceof A;
|
|
}
|
|
|
|
function isB(x: any): x is B {
|
|
return x instanceof B;
|
|
}
|
|
|
|
function f1(x: A | B) {
|
|
while (true) {
|
|
if (x instanceof A) {
|
|
x.prop.a;
|
|
}
|
|
else if (x instanceof B) {
|
|
x.prop.b;
|
|
}
|
|
}
|
|
}
|
|
|
|
function f2(x: A | B) {
|
|
while (true) {
|
|
if (isA(x)) {
|
|
x.prop.a;
|
|
}
|
|
else if (isB(x)) {
|
|
x.prop.b;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//// [narrowingOfDottedNames.js]
|
|
// Repro from #8383
|
|
var A = (function () {
|
|
function A() {
|
|
}
|
|
return A;
|
|
}());
|
|
var B = (function () {
|
|
function B() {
|
|
}
|
|
return B;
|
|
}());
|
|
function isA(x) {
|
|
return x instanceof A;
|
|
}
|
|
function isB(x) {
|
|
return x instanceof B;
|
|
}
|
|
function f1(x) {
|
|
while (true) {
|
|
if (x instanceof A) {
|
|
x.prop.a;
|
|
}
|
|
else if (x instanceof B) {
|
|
x.prop.b;
|
|
}
|
|
}
|
|
}
|
|
function f2(x) {
|
|
while (true) {
|
|
if (isA(x)) {
|
|
x.prop.a;
|
|
}
|
|
else if (isB(x)) {
|
|
x.prop.b;
|
|
}
|
|
}
|
|
}
|