Programming Languages
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Flow Type Checker Fails Null Check on Class Properties Despite Working on Parameters
In Flow, checking a nullable parameter with `if (n == null)` correctly narrows it to non-null, enabling safe use like `n > 10`. The same pattern fails for class properties, where `if (this.n == null)` does not narrow `this.n : ?number`, causing type errors on `this.n > 10`. This reveals an inconsist…