_getPatchsetHash(revisions, patchSet) {
      for (const rev in revisions) {
        if (revisions.hasOwnProperty(rev) &&
            revisions[rev] === patchSet) {
          return rev;
        }
      }
    }
/**
     * @param {!Object} revisions The revisions object keyed by revision hashes
     * @param {?Object} patchSet A revision already fetched from {revisions}
     * @return {string|undefined} the SHA hash corresponding to the revision.
     */
@param {!Object} revisions The revisions object keyed by revision hashes
@param {?Object} patchSet A revision already fetched from {revisions}
@return {string|undefined} the SHA hash corresponding to the revision.
@param { !Object } revisions The revisions object keyed by revision hashes @param { ?Object } patchSet A revision already fetched from { revisions } @return { string|undefined } the SHA hash corresponding to the revision .
_getPatchsetHash(revisions, patchSet) {
      for (const rev in revisions) {
        if (revisions.hasOwnProperty(rev) &&
            revisions[rev] === patchSet) {
          return rev;
        }
      }
    }
_getPatchsetHash ( revisions , patchSet ) { for ( const rev in revisions ) { if ( revisions . hasOwnProperty ( rev ) && revisions [ rev ] === patchSet ) { return rev ; } } }
@param {!Object} revisions The revisions object keyed by revision hashes
 @param {?Object} patchSet A revision already fetched from {revisions}
 @return {string|undefined} the SHA hash corresponding to the revision.
@param { !Object } revisions The revisions object keyed by revision hashes @param { ?Object } patchSet A revision already fetched from { revisions } @return { string|undefined } the SHA hash corresponding to the revision .