/* eslint-disable no-underscore-dangle */

export const MiniMongo = {}

const NAME_TO_CAUSE_MINIMONGO = null

if (global.Mongo) {
  MiniMongo.Collection = class MiniMongoCollection extends global.Mongo.Collection {
    constructor(name) {
      super(NAME_TO_CAUSE_MINIMONGO)
      this._name = name   // eslint-disable-line no-underscore-dangle
      this.indexes = []
    }

    _ensureIndex(keys, options) {
      if (! this._c2 || ! this._c2._simpleSchema) {
        throw new Error("Attach a schema before adding indexes so we can check they're valid")
      }
      const schemaDoc = this._c2._simpleSchema._schema
      Object.keys(keys).forEach(k => {
        if (! (k in schemaDoc)) {
          throw new Error(`Attempt to add an index key '${k}' which is not in the schema`)
        }
      })
      this.indexes.push(options ? { keys, options } : keys)
      // MiniMongo would normally throw an exception but we ignore it
      // If this was ever used on the client it should throw still
    }
  }
}

/* eslint-disable no-underscore-dangle */

export const MiniMongo = {}

const NAME_TO_CAUSE_MINIMONGO = null

if (global.Mongo) {
  MiniMongo.Collection = class MiniMongoCollection extends global.Mongo.Collection {
    constructor(name) {
      super(NAME_TO_CAUSE_MINIMONGO)
      this._name = name   // eslint-disable-line no-underscore-dangle
      this.indexes = []
    }

    _ensureIndex(keys, options) {
      if (! this._c2 || ! this._c2._simpleSchema) {
        throw new Error("Attach a schema before adding indexes so we can check they're valid")
      }
      const schemaDoc = this._c2._simpleSchema._schema
      Object.keys(keys).forEach(k => {
        if (! (k in schemaDoc)) {
          throw new Error(`Attempt to add an index key '${k}' which is not in the schema`)
        }
      })
      this.indexes.push(keys)
      // MiniMongo would normally throw an exception but we ignore it
      // If this was ever used on the client it should throw still
    }
  }
}

--- 
+++ 
@@ -22,7 +22,7 @@
           throw new Error(`Attempt to add an index key '${k}' which is not in the schema`)
         }
       })
-      this.indexes.push(keys)
+      this.indexes.push(options ? { keys, options } : keys)
       // MiniMongo would normally throw an exception but we ignore it
       // If this was ever used on the client it should throw still
     }
Store options with Minimongo indexes if passed
