app/middleware/leancloud.js:

const AV = require('leanengine');
AV.init({
appId: process.env.LEANCLOUD_APP_ID,
appKey: process.env.LEANCLOUD_APP_KEY,
masterKey: process.env.LEANCLOUD_APP_MASTER_KEY,
});
AV.Cloud.define('test', req => {
const { params } = req;
console.log(params);
});
module.exports = AV.koa2;

config/config.default.js:

module.exports = appInfo => {
······
  config.middleware = [ 'leancloud' ];
······
  return config;
};