Provide a set of project-wide references for the given position and document.
The document in which the command was invoked.
The position at which the command was invoked.
A cancellation token.
An array of locations or a thenable that resolves to such. The lack of a result can be
signaled by returning undefined
, null
, or an empty array.
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The reference provider interface defines the contract between extensions and the find references-feature.