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isError ​

Problem ​

You need to distinguish Error instances from other thrown values — TypeScript catch clauses type err as unknown.

Solution ​

Use isError(value) to narrow to Error.

ts
import { isError } from '@vielzeug/arsenal';

try {
  riskyOperation();
} catch (err) {
  if (isError(err)) {
    console.error(err.message);
  }
}