2bfd919b6a
* Narrow literal element accesses
This means that, for example, the tuple `[number, string?]` allows its
second element to be narrowed with element access:
```ts
export function f(pair: [number, string?]): string {
return pair[1] ? pair[1] : 'nope';
}
```
* Update baselines
* Cleanup
* More cleanup
* Test dashes in property names
* More cleanup
* Delete undead code
81 lines
1.9 KiB
TypeScript
81 lines
1.9 KiB
TypeScript
// @strict: true
|
|
interface Square {
|
|
["dash-ok"]: "square";
|
|
["square-size"]: number;
|
|
}
|
|
interface Rectangle {
|
|
["dash-ok"]: "rectangle";
|
|
width: number;
|
|
height: number;
|
|
}
|
|
interface Circle {
|
|
["dash-ok"]: "circle";
|
|
radius: number;
|
|
}
|
|
type Shape = Square | Rectangle | Circle;
|
|
interface Subshape {
|
|
"0": {
|
|
sub: {
|
|
under: {
|
|
shape: Shape;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
function area(s: Shape): number {
|
|
switch(s['dash-ok']) {
|
|
case "square": return s['square-size'] * s['square-size'];
|
|
case "rectangle": return s.width * s['height'];
|
|
case "circle": return Math.PI * s['radius'] * s.radius;
|
|
}
|
|
}
|
|
function subarea(s: Subshape): number {
|
|
switch(s[0]["sub"].under["shape"]["dash-ok"]) {
|
|
case "square": return s[0].sub.under.shape["square-size"] * s[0].sub.under.shape["square-size"];
|
|
case "rectangle": return s[0]["sub"]["under"]["shape"]["width"] * s[0]["sub"]["under"]["shape"].height;
|
|
case "circle": return Math.PI * s[0].sub.under["shape"].radius * s[0]["sub"].under.shape["radius"];
|
|
}
|
|
}
|
|
|
|
interface X {
|
|
0: "xx",
|
|
1: number
|
|
}
|
|
|
|
interface Y {
|
|
0: "yy",
|
|
1: string
|
|
}
|
|
|
|
type A = ["aa", number];
|
|
type B = ["bb", string];
|
|
|
|
type Z = X | Y;
|
|
|
|
type C = A | B;
|
|
|
|
function check(z: Z, c: C) {
|
|
z[0] // fine, typescript sees "xx" | "yy"
|
|
switch (z[0]) {
|
|
case "xx":
|
|
var xx: number = z[1] // should be number
|
|
break;
|
|
case "yy":
|
|
var yy: string = z[1] // should be string
|
|
break;
|
|
}
|
|
c[0] // fine, typescript sees "xx" | "yy"
|
|
switch (c[0]) {
|
|
case "aa":
|
|
var aa: number = c[1] // should be number
|
|
break;
|
|
case "bb":
|
|
var bb: string = c[1] // should be string
|
|
break;
|
|
}
|
|
}
|
|
|
|
export function g(pair: [number, string?]): string {
|
|
return pair[1] ? pair[1] : 'nope';
|
|
}
|