function _formatMessage()

in shared/AppInsightsCommon/src/Telemetry/Exception.ts [45:70]

• 18 lines of code
• 19 McCabe index (conditional complexity)

function _formatMessage(theEvent: any, errorType: string) {
    let evtMessage = theEvent;
    if (theEvent) {
        if (evtMessage && !isString(evtMessage)) {
            evtMessage = theEvent[strMessage] || theEvent[strDescription] || evtMessage;
        }

        // Make sure the message is a string
        if (evtMessage && !isString(evtMessage)) {
            // tslint:disable-next-line: prefer-conditional-expression
            evtMessage = _stringify(evtMessage, true);
        }

        if (theEvent["filename"]) {
            // Looks like an event object with filename
            evtMessage = evtMessage + " @" + (theEvent["filename"] || "") + ":" + (theEvent["lineno"] || "?") + ":" + (theEvent["colno"] || "?");
        }
    }
    
    // Automatically add the error type to the message if it does already appear to be present
    if (errorType && errorType !== "String" && errorType !== "Object" && errorType !== "Error" && (evtMessage || "").indexOf(errorType) === -1) {
        evtMessage = errorType + ": " + evtMessage;
    }

    return evtMessage || "";
}