84 lines
1.9 KiB
Plaintext
84 lines
1.9 KiB
Plaintext
=== tests/cases/conformance/types/intersection/intersectionNarrowing.ts ===
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// Repros from #43130
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function f1<T>(x: T & string | T & undefined) {
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>f1 : <T>(x: (T & string) | (T & undefined)) => void
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>x : (T & string) | (T & undefined)
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if (x) {
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>x : (T & string) | (T & undefined)
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x; // Should narrow to T & string
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>x : T & string
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}
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}
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function f2<T>(x: T & string | T & undefined) {
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>f2 : <T>(x: (T & string) | (T & undefined)) => void
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>x : (T & string) | (T & undefined)
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if (x !== undefined) {
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>x !== undefined : boolean
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>x : (T & string) | (T & undefined)
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>undefined : undefined
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x; // Should narrow to T & string
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>x : T & string
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}
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else {
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x; // Should narrow to T & undefined
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>x : T & undefined
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}
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}
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function f3<T>(x: T & string | T & number) {
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>f3 : <T>(x: (T & string) | (T & number)) => void
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>x : (T & string) | (T & number)
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if (typeof x === "string") {
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>typeof x === "string" : boolean
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>typeof x : "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function"
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>x : (T & string) | (T & number)
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>"string" : "string"
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x; // Should narrow to T & string
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>x : T & string
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}
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else {
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x; // Should narrow to T & number
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>x : T & number
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}
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}
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function f4<T>(x: T & 1 | T & 2) {
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>f4 : <T>(x: (T & 1) | (T & 2)) => void
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>x : (T & 1) | (T & 2)
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switch (x) {
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>x : (T & 1) | (T & 2)
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case 1: x; break; // T & 1
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>1 : 1
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>x : T & 1
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case 2: x; break; // T & 2
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>2 : 2
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>x : T & 2
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default: x; // Should narrow to never
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>x : never
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}
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}
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function f5<T extends string | number>(x: T & number) {
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>f5 : <T extends string | number>(x: T & number) => void
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>x : T & number
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const t1 = x === "hello"; // Should be an error
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>t1 : boolean
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>x === "hello" : boolean
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>x : T & number
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>"hello" : "hello"
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}
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