79 lines
1.6 KiB
TypeScript
79 lines
1.6 KiB
TypeScript
//// [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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if (x) {
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x; // Should narrow to 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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if (x !== undefined) {
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x; // Should narrow to 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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}
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}
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function f3<T>(x: T & string | T & number) {
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if (typeof x === "string") {
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x; // Should narrow to 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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}
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}
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function f4<T>(x: T & 1 | T & 2) {
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switch (x) {
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case 1: x; break; // T & 1
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case 2: x; break; // T & 2
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default: x; // Should narrow to 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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const t1 = x === "hello"; // Should be an error
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}
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//// [intersectionNarrowing.js]
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"use strict";
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// Repros from #43130
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function f1(x) {
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if (x) {
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x; // Should narrow to T & string
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}
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}
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function f2(x) {
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if (x !== undefined) {
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x; // Should narrow to 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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}
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}
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function f3(x) {
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if (typeof x === "string") {
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x; // Should narrow to 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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}
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}
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function f4(x) {
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switch (x) {
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case 1:
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x;
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break; // T & 1
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case 2:
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x;
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break; // T & 2
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default: x; // Should narrow to never
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}
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}
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function f5(x) {
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var t1 = x === "hello"; // Should be an error
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}
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