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From the docs it looks like you have to import the actual model, and not refer to it by string.

Try something like this?

var Account = require('./account.js');
var Project = require('./project.js');
var User = require('./user.js');

module.exports = baseModel =>
  baseModel.extend({
    tableName: 'access_tokens',
    keyable() {
      return this.morphTo('keyable', Account, Project, User);
    }
  });