maxmustermann/TypeScript
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
TypeScript/tests/baselines/reference/typeGuardsInConditionalExpression.types
Cyrus Najmabadi a2efe474cf Split symbol baselines from type baselines.
2015-04-15 16:44:20 -07:00

389 lines
13 KiB
Plaintext
Raw Blame History

=== tests/cases/conformance/expressions/typeGuards/typeGuardsInConditionalExpression.ts ===
// In the true expression of a conditional expression,
// the type of a variable or parameter is narrowed by any type guard in the condition when true,
// provided the true expression contains no assignments to the variable or parameter.
// In the false expression of a conditional expression,
// the type of a variable or parameter is narrowed by any type guard in the condition when false,
// provided the false expression contains no assignments to the variable or parameter.
function foo(x: number | string) {
>foo : (x: string | number) => number
>x : string | number
return typeof x === "string"
>typeof x === "string" ? x.length // string : x++ : number
>typeof x === "string" : boolean
>typeof x : string
>x : string | number
>"string" : string
? x.length // string
>x.length : number
>x : string
>length : number
: x++; // number
>x++ : number
>x : number
}
function foo2(x: number | string) {
>foo2 : (x: string | number) => string | number
>x : string | number
// x is assigned in the if true branch, the type is not narrowed
return typeof x === "string"
>typeof x === "string" ? (x = 10 && x)// string | number : x : string | number
>typeof x === "string" : boolean
>typeof x : string
>x : string | number
>"string" : string
? (x = 10 && x)// string | number
>(x = 10 && x) : string | number
>x = 10 && x : string | number
>x : string | number
>10 && x : string | number
>10 : number
>x : string | number
: x; // string | number
>x : string | number
}
function foo3(x: number | string) {
>foo3 : (x: string | number) => string | number
>x : string | number
// x is assigned in the if false branch, the type is not narrowed
// even though assigned using same type as narrowed expression
return typeof x === "string"
>typeof x === "string" ? (x = "Hello" && x) // string | number : x : string | number
>typeof x === "string" : boolean
>typeof x : string
>x : string | number
>"string" : string
? (x = "Hello" && x) // string | number
>(x = "Hello" && x) : string | number
>x = "Hello" && x : string | number
>x : string | number
>"Hello" && x : string | number
>"Hello" : string
>x : string | number
: x; // string | number
>x : string | number
}
function foo4(x: number | string) {
>foo4 : (x: string | number) => string | number
>x : string | number
// false branch updates the variable - so here it is not number
// even though assigned using same type as narrowed expression
return typeof x === "string"
>typeof x === "string" ? x // string | number : (x = 10 && x) : string | number
>typeof x === "string" : boolean
>typeof x : string
>x : string | number
>"string" : string
? x // string | number
>x : string | number
: (x = 10 && x); // string | number
>(x = 10 && x) : string | number
>x = 10 && x : string | number
>x : string | number
>10 && x : string | number
>10 : number
>x : string | number
}
function foo5(x: number | string) {
>foo5 : (x: string | number) => string | number
>x : string | number
// false branch updates the variable - so here it is not number
return typeof x === "string"
>typeof x === "string" ? x // string | number : (x = "hello" && x) : string | number
>typeof x === "string" : boolean
>typeof x : string
>x : string | number
>"string" : string
? x // string | number
>x : string | number
: (x = "hello" && x); // string | number
>(x = "hello" && x) : string | number
>x = "hello" && x : string | number
>x : string | number
>"hello" && x : string | number
>"hello" : string
>x : string | number
}
function foo6(x: number | string) {
>foo6 : (x: string | number) => string | number
>x : string | number
// Modify in both branches
return typeof x === "string"
>typeof x === "string" ? (x = 10 && x) // string | number : (x = "hello" && x) : string | number
>typeof x === "string" : boolean
>typeof x : string
>x : string | number
>"string" : string
? (x = 10 && x) // string | number
>(x = 10 && x) : string | number
>x = 10 && x : string | number
>x : string | number
>10 && x : string | number
>10 : number
>x : string | number
: (x = "hello" && x); // string | number
>(x = "hello" && x) : string | number
>x = "hello" && x : string | number
>x : string | number
>"hello" && x : string | number
>"hello" : string
>x : string | number
}
function foo7(x: number | string | boolean) {
>foo7 : (x: string | number | boolean) => boolean
>x : string | number | boolean
return typeof x === "string"
>typeof x === "string" ? x === "hello" // string : typeof x === "boolean" ? x // boolean : x == 10 : boolean
>typeof x === "string" : boolean
>typeof x : string
>x : string | number | boolean
>"string" : string
? x === "hello" // string
>x === "hello" : boolean
>x : string
>"hello" : string
: typeof x === "boolean"
>typeof x === "boolean" ? x // boolean : x == 10 : boolean
>typeof x === "boolean" : boolean
>typeof x : string
>x : number | boolean
>"boolean" : string
? x // boolean
>x : boolean
: x == 10; // number
>x == 10 : boolean
>x : number
>10 : number
}
function foo8(x: number | string | boolean) {
>foo8 : (x: string | number | boolean) => boolean
>x : string | number | boolean
var b: number | boolean;
>b : number | boolean
return typeof x === "string"
>typeof x === "string" ? x === "hello" : ((b = x) && // number | boolean (typeof x === "boolean" ? x // boolean : x == 10)) : boolean
>typeof x === "string" : boolean
>typeof x : string
>x : string | number | boolean
>"string" : string
? x === "hello"
>x === "hello" : boolean
>x : string
>"hello" : string
: ((b = x) && // number | boolean
>((b = x) && // number | boolean (typeof x === "boolean" ? x // boolean : x == 10)) : boolean
>(b = x) && // number | boolean (typeof x === "boolean" ? x // boolean : x == 10) : boolean
>(b = x) : number | boolean
>b = x : number | boolean
>b : number | boolean
>x : number | boolean
(typeof x === "boolean"
>(typeof x === "boolean" ? x // boolean : x == 10) : boolean
>typeof x === "boolean" ? x // boolean : x == 10 : boolean
>typeof x === "boolean" : boolean
>typeof x : string
>x : number | boolean
>"boolean" : string
? x // boolean
>x : boolean
: x == 10)); // number
>x == 10 : boolean
>x : number
>10 : number
}
function foo9(x: number | string) {
>foo9 : (x: string | number) => boolean
>x : string | number
var y = 10;
>y : number
>10 : number
// usage of x or assignment to separate variable shouldn't cause narrowing of type to stop
return typeof x === "string"
>typeof x === "string" ? ((y = x.length) && x === "hello") // string : x === 10 : boolean
>typeof x === "string" : boolean
>typeof x : string
>x : string | number
>"string" : string
? ((y = x.length) && x === "hello") // string
>((y = x.length) && x === "hello") : boolean
>(y = x.length) && x === "hello" : boolean
>(y = x.length) : number
>y = x.length : number
>y : number
>x.length : number
>x : string
>length : number
>x === "hello" : boolean
>x : string
>"hello" : string
: x === 10; // number
>x === 10 : boolean
>x : number
>10 : number
}
function foo10(x: number | string | boolean) {
>foo10 : (x: string | number | boolean) => string
>x : string | number | boolean
// Mixing typeguards
var b: boolean | number;
>b : number | boolean
return typeof x === "string"
>typeof x === "string" ? x // string : ((b = x) // x is number | boolean && typeof x === "number" && x.toString()) : string
>typeof x === "string" : boolean
>typeof x : string
>x : string | number | boolean
>"string" : string
? x // string
>x : string
: ((b = x) // x is number | boolean
>((b = x) // x is number | boolean && typeof x === "number" && x.toString()) : string
>(b = x) // x is number | boolean && typeof x === "number" && x.toString() : string
>(b = x) // x is number | boolean && typeof x === "number" : boolean
>(b = x) : number | boolean
>b = x : number | boolean
>b : number | boolean
>x : number | boolean
&& typeof x === "number"
>typeof x === "number" : boolean
>typeof x : string
>x : number | boolean
>"number" : string
&& x.toString()); // x is number
>x.toString() : string
>x.toString : (radix?: number) => string
>x : number
>toString : (radix?: number) => string
}
function foo11(x: number | string | boolean) {
>foo11 : (x: string | number | boolean) => string | number | boolean
>x : string | number | boolean
// Mixing typeguards
// Assigning value to x deep inside another guard stops narrowing of type too
var b: number | boolean | string;
>b : string | number | boolean
return typeof x === "string"
>typeof x === "string" ? x // number | boolean | string - changed in the false branch : ((b = x) // x is number | boolean | string - because the assignment changed it && typeof x === "number" && (x = 10) // assignment to x && x) : string | number | boolean
>typeof x === "string" : boolean
>typeof x : string
>x : string | number | boolean
>"string" : string
? x // number | boolean | string - changed in the false branch
>x : string | number | boolean
: ((b = x) // x is number | boolean | string - because the assignment changed it
>((b = x) // x is number | boolean | string - because the assignment changed it && typeof x === "number" && (x = 10) // assignment to x && x) : string | number | boolean
>(b = x) // x is number | boolean | string - because the assignment changed it && typeof x === "number" && (x = 10) // assignment to x && x : string | number | boolean
>(b = x) // x is number | boolean | string - because the assignment changed it && typeof x === "number" && (x = 10) : number
>(b = x) // x is number | boolean | string - because the assignment changed it && typeof x === "number" : boolean
>(b = x) : string | number | boolean
>b = x : string | number | boolean
>b : string | number | boolean
>x : string | number | boolean
&& typeof x === "number"
>typeof x === "number" : boolean
>typeof x : string
>x : string | number | boolean
>"number" : string
&& (x = 10) // assignment to x
>(x = 10) : number
>x = 10 : number
>x : string | number | boolean
>10 : number
&& x); // x is number | boolean | string
>x : string | number | boolean
}
function foo12(x: number | string | boolean) {
>foo12 : (x: string | number | boolean) => number
>x : string | number | boolean
// Mixing typeguards
// Assigning value to x in outer guard shouldn't stop narrowing in the inner expression
var b: number | boolean | string;
>b : string | number | boolean
return typeof x === "string"
>typeof x === "string" ? (x = 10 && x.toString().length) // number | boolean | string - changed here : ((b = x) // x is number | boolean | string - changed in true branch && typeof x === "number" && x) : number
>typeof x === "string" : boolean
>typeof x : string
>x : string | number | boolean
>"string" : string
? (x = 10 && x.toString().length) // number | boolean | string - changed here
>(x = 10 && x.toString().length) : number
>x = 10 && x.toString().length : number
>x : string | number | boolean
>10 && x.toString().length : number
>10 : number
>x.toString().length : number
>x.toString() : string
>x.toString : () => string
>x : string | number | boolean
>toString : () => string
>length : number
: ((b = x) // x is number | boolean | string - changed in true branch
>((b = x) // x is number | boolean | string - changed in true branch && typeof x === "number" && x) : number
>(b = x) // x is number | boolean | string - changed in true branch && typeof x === "number" && x : number
>(b = x) // x is number | boolean | string - changed in true branch && typeof x === "number" : boolean
>(b = x) : string | number | boolean
>b = x : string | number | boolean
>b : string | number | boolean
>x : string | number | boolean
&& typeof x === "number"
>typeof x === "number" : boolean
>typeof x : string
>x : string | number | boolean
>"number" : string
&& x); // x is number
>x : number
}
Reference in a new issue View git blame Copy permalink