DeprecationReportBody: lineNumber property

{{APIRef("Reporting API")}}{{AvailableInWorkers}}{{SeeCompatTable}}

The lineNumber read-only property of the {{domxref("DeprecationReportBody")}} interface returns the line in the source file in which the deprecated feature was used.

[!NOTE] This property is most useful alongside {{domxref("DeprecationReportBody.sourceFile")}} as it enables the location of the line in that file where the error occurred.

Value

An integer, or null if the line is not known.

Examples

In this example we create a new {{domxref("ReportingObserver")}} to observe deprecation reports, then print the value of lineNumber to the console.

let options = {
  types: ["deprecation"],
  buffered: true,
};

let observer = new ReportingObserver((reports, observer) => {
  let firstReport = reports[0];
  console.log(firstReport.type); // deprecation
  console.log(firstReport.body.sourceFile); // the source file
  console.log(firstReport.body.lineNumber); // the line in that file
}, options);

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}