The utilization of the JavaScript null coalescing operator ?? resulted in a crash of the .NET JS minifier/bundler

I'm facing an issue with my code where using the ?? operator causes a crash in the MVC built-in bundler/minifier. The problematic line is:

span.textContent = typeof (info) === 'object' ? info.column.caption ?? info.column.dataField : info;

I have narrowed down the problem to this specific line of code. Removing the operator or commenting out this line resolves the crash. Is there a solution to fix this?

Below is the error message generated:

[NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.]
   Microsoft.Ajax.Utilities.JSParser.ParseExpression(AstNode leftHandSide, Boolean single, Boolean bCanAssign, JSToken inToken) +820
   ...
   (Truncated error message for brevity)
   ...
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +134
javascriptasp.net.netasp.net-mvcbundling-and-minification

Answer №1

While I don't have a definitive solution, I can suggest a workaround. By using the or-operator ||, you can address the issue at hand. If info.column.caption evaluates to false, then info.column.dataField will be assessed and utilized as the value of the combined expression.

In response to your query, I developed some test scenarios.

let info;
let textContent;

info = "test 1 info";
textContent = typeof (info) === 'object' ? info.column.caption || info.column.dataField : info;
console.log(textContent);

info = { column: { caption: "test 2 caption", dataField: "test 2 dataField" } };
textContent= typeof (info) === 'object' ? info.column.caption || info.column.dataField : info;
console.log(textContent);

info = { column: { caption: "", dataField: "test 3 dataField" } };
textContent = typeof (info) === 'object' ? info.column.caption || info.column.dataField : info;
console.log(textContent);

info = { column: { dataField: "test 4 dataField" } };
textContent = typeof (info) === 'object' ? info.column.caption || info.column.dataField : info;
console.log(textContent);

The output is as follows:

test 1 info

test 2 caption

test 3 dataField

test 4 dataField

It's worth noting that if info.column.caption happens to be an empty string (as seen in test case 3), it will also register as false, which may or may not align with your intentions.

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