code: function getKeyWidth(property) {
              const startToken = sourceCode.getFirstToken(property);
              const endToken = getLastTokenBeforeColon(property.key);
  
              return endToken.range[1] - startToken.range[0];
          }
docs: Gets the number of characters in a key, including quotes around string
  keys and braces around computed property keys.
  @param {ASTNode} property Property of on object literal.
  @returns {int} Width of the key.