TypeScript/tests/baselines/reference/typeGuardOfFormTypeOfNumber.types
2015-04-15 16:44:20 -07:00

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=== tests/cases/conformance/expressions/typeGuards/typeGuardOfFormTypeOfNumber.ts ===
class C { private p: string };
>C : C
>p : string
var str: string;
>str : string
var bool: boolean;
>bool : boolean
var num: number;
>num : number
var strOrNum: string | number;
>strOrNum : string | number
var strOrBool: string | boolean;
>strOrBool : string | boolean
var numOrBool: number | boolean
>numOrBool : number | boolean
var strOrNumOrBool: string | number | boolean;
>strOrNumOrBool : string | number | boolean
var strOrC: string | C;
>strOrC : string | C
>C : C
var numOrC: number | C;
>numOrC : number | C
>C : C
var boolOrC: boolean | C;
>boolOrC : boolean | C
>C : C
var c: C;
>c : C
>C : C
// A type guard of the form typeof x === s,
// where s is a string literal with the value 'string', 'number', or 'boolean',
// - when true, narrows the type of x to the given primitive type, or
// - when false, removes the primitive type from the type of x.
if (typeof strOrNum === "number") {
>typeof strOrNum === "number" : boolean
>typeof strOrNum : string
>strOrNum : string | number
>"number" : string
num = strOrNum; // number
>num = strOrNum : number
>num : number
>strOrNum : number
}
else {
str === strOrNum; // string
>str === strOrNum : boolean
>str : string
>strOrNum : string
}
if (typeof numOrBool === "number") {
>typeof numOrBool === "number" : boolean
>typeof numOrBool : string
>numOrBool : number | boolean
>"number" : string
num = numOrBool; // number
>num = numOrBool : number
>num : number
>numOrBool : number
}
else {
var x: number | boolean = numOrBool; // number | boolean
>x : number | boolean
>numOrBool : boolean
}
if (typeof strOrNumOrBool === "number") {
>typeof strOrNumOrBool === "number" : boolean
>typeof strOrNumOrBool : string
>strOrNumOrBool : string | number | boolean
>"number" : string
num = strOrNumOrBool; // number
>num = strOrNumOrBool : number
>num : number
>strOrNumOrBool : number
}
else {
strOrBool = strOrNumOrBool; // string | boolean
>strOrBool = strOrNumOrBool : string | boolean
>strOrBool : string | boolean
>strOrNumOrBool : string | boolean
}
if (typeof numOrC === "number") {
>typeof numOrC === "number" : boolean
>typeof numOrC : string
>numOrC : number | C
>"number" : string
num = numOrC; // number
>num = numOrC : number
>num : number
>numOrC : number
}
else {
c = numOrC; // C
>c = numOrC : C
>c : C
>numOrC : C
}
// Narrowing occurs only if target type is a subtype of variable type
if (typeof strOrBool === "number") {
>typeof strOrBool === "number" : boolean
>typeof strOrBool : string
>strOrBool : string | boolean
>"number" : string
var y1: string | boolean = strOrBool; // string | boolean
>y1 : string | boolean
>strOrBool : string | boolean
}
else {
var y2: string | boolean = strOrBool; // string | boolean
>y2 : string | boolean
>strOrBool : string | boolean
}
// A type guard of the form typeof x !== s, where s is a string literal,
// - when true, narrows the type of x by typeof x === s when false, or
// - when false, narrows the type of x by typeof x === s when true.
if (typeof strOrNum !== "number") {
>typeof strOrNum !== "number" : boolean
>typeof strOrNum : string
>strOrNum : string | number
>"number" : string
str === strOrNum; // string
>str === strOrNum : boolean
>str : string
>strOrNum : string
}
else {
num = strOrNum; // number
>num = strOrNum : number
>num : number
>strOrNum : number
}
if (typeof numOrBool !== "number") {
>typeof numOrBool !== "number" : boolean
>typeof numOrBool : string
>numOrBool : number | boolean
>"number" : string
var x: number | boolean = numOrBool; // number | boolean
>x : number | boolean
>numOrBool : boolean
}
else {
num = numOrBool; // number
>num = numOrBool : number
>num : number
>numOrBool : number
}
if (typeof strOrNumOrBool !== "number") {
>typeof strOrNumOrBool !== "number" : boolean
>typeof strOrNumOrBool : string
>strOrNumOrBool : string | number | boolean
>"number" : string
strOrBool = strOrNumOrBool; // string | boolean
>strOrBool = strOrNumOrBool : string | boolean
>strOrBool : string | boolean
>strOrNumOrBool : string | boolean
}
else {
num = strOrNumOrBool; // number
>num = strOrNumOrBool : number
>num : number
>strOrNumOrBool : number
}
if (typeof numOrC !== "number") {
>typeof numOrC !== "number" : boolean
>typeof numOrC : string
>numOrC : number | C
>"number" : string
c = numOrC; // C
>c = numOrC : C
>c : C
>numOrC : C
}
else {
num = numOrC; // number
>num = numOrC : number
>num : number
>numOrC : number
}
// Narrowing occurs only if target type is a subtype of variable type
if (typeof strOrBool !== "number") {
>typeof strOrBool !== "number" : boolean
>typeof strOrBool : string
>strOrBool : string | boolean
>"number" : string
var y1: string | boolean = strOrBool; // string | boolean
>y1 : string | boolean
>strOrBool : string | boolean
}
else {
var y2: string | boolean = strOrBool; // string | boolean
>y2 : string | boolean
>strOrBool : string | boolean
}