code: function getPropertyWhitespace(property) {
              const whitespace = /(\s*):(\s*)/u.exec(sourceCode.getText().slice(
                  property.key.range[1], property.value.range[0]
              ));
  
              if (whitespace) {
                  return {
                      beforeColon: whitespace[1],
                      afterColon: whitespace[2]
                  };
              }
              return null;
          }
docs: Gets the whitespace around the colon in an object literal property.
  @param {ASTNode} property Property node from an object literal.
  @returns {Object} Whitespace before and after the property's colon.