Microsoft/TypeScript
Non-null assertion should work on possibly-uninitialized auto-typed `let` variables
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#52.439 geöffnet am 26.01.2023
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Beschreibung
Bug Report
🔎 Search Terms
non-null postfix bang implicit any
🕗 Version & Regression Information
- This is the behavior in every version I tried
⏯ Playground Link
💻 Code
let foo;
if (Math.random() > 0.5) {
foo = "hello";
}
// bar: string | undefined, seems fine
let bar = foo;
/* -- pretend I know foo is defined for other reasons -- */
// Error, foo is implicitly any
let baz = foo!;
🙁 Actual behavior
Implicit any on foo!
🙂 Expected behavior
Since the inferred type of foo (as seen in bar) is string | undefined, foo! should trivially have the type string