The file for the request (absolute pathname required).
The line number for the request (1-based).
The character offset (on the line) for the request (1-based).
Requires that the enclosing span be a multi-line comment, or else the request returns undefined.
Optionalproject
Instances of this interface specify a location in a source file: (file, line, character offset), where line and character offset are 1-based.