code: function LinkMeta(properties) {
                  this.refs = [];
                  this.tags = [];
                  if (properties)
                      for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                          if (properties[keys[i]] != null)
                              this[keys[i]] = properties[keys[i]];
              }
docs: Properties of a LinkMeta.
  @memberof stratumn.chainscript
  @interface ILinkMeta
  @property {string|null} [clientId] LinkMeta clientId
  @property {Uint8Array|null} [prevLinkHash] LinkMeta prevLinkHash
  @property {number|null} [priority] LinkMeta priority
  @property {Array.<stratumn.chainscript.ILinkReference>|null} [refs] LinkMeta refs
  @property {number|null} [outDegree] LinkMeta outDegree
  @property {stratumn.chainscript.IProcess|null} [process] LinkMeta process
  @property {string|null} [mapId] LinkMeta mapId
  @property {string|null} [action] LinkMeta action
  @property {string|null} [step] LinkMeta step
  @property {Array.<string>|null} [tags] LinkMeta tags
  @property {Uint8Array|null} [data] LinkMeta data
   
  Constructs a new LinkMeta.
  @memberof stratumn.chainscript
  @classdesc Represents a LinkMeta.
  @implements ILinkMeta
  @constructor
  @param {stratumn.chainscript.ILinkMeta=} [properties] Properties to set