in src/references/index.ts [73:85]
async function copyCommand(item: ReferencesModel | ReferenceItem | FileItem | unknown) {
let val: string | undefined;
if (item instanceof ReferencesModel) {
val = await item.asCopyText();
} else if (item instanceof ReferenceItem) {
val = await item.asCopyText();
} else if (item instanceof FileItem) {
val = await item.asCopyText();
}
if (val) {
await vscode.env.clipboard.writeText(val);
}
};