DeprecationReportBody: lineNumber property

The lineNumber read-only property of the DeprecationReportBody interface returns the line in the source file in which the deprecated feature was used.

Value

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

Examples

In this example we create a new 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

Browser compatibility