d8f736d319
* For typeof narrow all union members prior to filtering * Revise narrowTypeByTypeof to both narrow unions and applicable union members * Add repros from issue
17 lines
660 B
TypeScript
17 lines
660 B
TypeScript
// @strict: true
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function stringify1(anything: { toString(): string } | undefined): string {
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return typeof anything === "string" ? anything.toUpperCase() : "";
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}
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function stringify2(anything: {} | undefined): string {
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return typeof anything === "string" ? anything.toUpperCase() : "";
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}
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function stringify3(anything: unknown | undefined): string { // should simplify to just `unknown` which should narrow fine
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return typeof anything === "string" ? anything.toUpperCase() : "";
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}
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function stringify4(anything: { toString?(): string } | undefined): string {
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return typeof anything === "string" ? anything.toUpperCase() : "";
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}
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