message: Call Map.keys().
diff: @@ -47,8 +47,7 @@ export class Reference implements IProvider {
  private provide(args: {document: vscode.TextDocument, position: vscode.Position, token: vscode.CancellationToken, context: vscode.CompletionContext}): vscode.CompletionItem[] {
  // Compile the suggestion object to array
  this.updateAll(args)
  - let keys = Array.from(this.suggestions.keys())
  - keys = keys.concat(Object.keys(this.prevIndexObj))
  + let keys = [...this.suggestions.keys(), ...this.prevIndexObj.keys()]
  keys = Array.from(new Set(keys))
  const items: vscode.CompletionItem[] = []
  for (const key of keys) {
  