File: controlFlowCommaExpressionFunctionCall.ts

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const otherValue = () => true;
const value : number | string = null as any;

function isNumber(obj: any): obj is number {
    return true; // method implementation irrelevant
}

// Bad case - fails
if (isNumber((otherValue(), value))) {
    const b = value; // string | number , but should be number
}