polygerrit-ui/app/behaviors/gr-change-table-behavior/gr-change-table-behavior.html

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<script>
(function(window) {
  'use strict';

  window.Gerrit = window.Gerrit || {};

  /** @polymerBehavior Gerrit.ChangeTableBehavior */
  Gerrit.ChangeTableBehavior = {
    properties: {
      columnNames: {
        type: Array,
        value: [
          'Subject',
          'Status',
          'Owner',
          'Assignee',
          'Repo',
          'Branch',
          'Updated',
          'Size',
        ],
        readOnly: true,
      },
    },

    /**
     * Returns the complement to the given column array
     * @param {Array} columns
     * @return {!Array}
     */
    getComplementColumns(columns) {
      return this.columnNames.filter(column => {
        return !columns.includes(column);
      });
    },

    /**
     * @param {string} columnToCheck
     * @param {!Array} columnsToDisplay
     * @return {boolean}
     */
    isColumnHidden(columnToCheck, columnsToDisplay) {
      return !columnsToDisplay.includes(columnToCheck);
    },

    /**
     * The Project column was renamed to Repo, but some users may have
     * preferences that use its old name. If that column is found, rename it
     * before use.
     * @param {!Array<string>} columns
     * @return {!Array<string>} If the column was renamed, returns a new array
     *     with the corrected name. Otherwise, it returns the original param.
     */
    getVisibleColumns(columns) {
      const projectIndex = columns.indexOf('Project');
      if (projectIndex === -1) { return columns; }
      const newColumns = columns.slice(0);
      newColumns[projectIndex] = 'Repo';
      return newColumns;
    },
  };

  // eslint-disable-next-line no-unused-vars
  function defineEmptyMixin() {
    // This is a temporary function.
    // Polymer linter doesn't process correctly the following code:
    // class MyElement extends Polymer.mixinBehaviors([legacyBehaviors], ...) {...}
    // To workaround this issue, the mock mixin is declared in this method.
    // In the following changes, legacy behaviors will be converted to mixins.

    /**
     * @polymer
     * @mixinFunction
     */
    Gerrit.ChangeTableMixin = base =>
      class extends base {
        static get properties() {
          return {
            columnNames: {
              type: Array,
            },
          };
        }

        isColumnHidden(columnToCheck, columnsToDisplay) {}
      };
  }
})(window);
</script>