addReturnStatement(scopeFunction, returnNode) {
    for (const data of this.functions) {
      if (data.node === scopeFunction) {
        data.addReturnValue(returnNode.argument)
        break
      }
    }
  }
Adds the given return statement to the return value of the function.
@param {FunctionExpression | ArrowFunctionExpression | FunctionDeclaration} scopeFunction
@param {ReturnStatement} returnNode