TypeError: Wechat is not a constructor

[libo83]

Hi,
I found this repo from Medium post. Great job!

However, after I checkout master repo I got follow Error, could you please help?

PS C:\Users\xxxx\Documents\GitHub\wechat_programs\WeChat-JSSDK-Backend> npm start

wechat-demo@0.0.0 start C:\Users\xxxx\Documents\GitHub\wechat_programs\WeChat-JSSDK-Backend
node ./bin/www

C:\Users\xxxx\Documents\GitHub\wechat_programs\WeChat-JSSDK-Backend\app.js:30
const wx = new Wechat(wechatConfig);
^

TypeError: Wechat is not a constructor
at Object. (C:\Users\xxxx\Documents\GitHub\wechat_programs\WeChat-JSSDK-Backend\app.js:30:12)
at Module._compile (internal/modules/cjs/loader.js:1138:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)
at Module.load (internal/modules/cjs/loader.js:986:32)
at Function.Module._load (internal/modules/cjs/loader.js:879:14)
at Module.require (internal/modules/cjs/loader.js:1026:19)
at require (internal/modules/cjs/helpers.js:72:18)
at Object. (C:\Users\xxxx\Documents\GitHub\wechat_programs\WeChat-JSSDK-Backend\bin\www:7:11)
at Module._compile (internal/modules/cjs/loader.js:1138:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)
at Module.load (internal/modules/cjs/loader.js:986:32)
at Function.Module._load (internal/modules/cjs/loader.js:879:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
at internal/main/run_main_module.js:17:47
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! wechat-demo@0.0.0 start: node ./bin/www
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the wechat-demo@0.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\xxxx\AppData\Roaming\npm-cache_logs\2020-07-19T08_03_03_260Z-debug.log
PS C:\Users\xxxx\Documents\GitHub\wechat_programs\WeChat-JSSDK-Backend> npm -v
6.14.5
PS C:\Users\xxxx\Documents\GitHub\wechat_programs\WeChat-JSSDK-Backend> node -v
v12.18.2
PS C:\Users\xxxx\Documents\GitHub\wechat_programs\WeChat-JSSDK-Backend> npm run
Lifecycle scripts included in wechat-demo:
start
node ./bin/www

available via npm run-script:
dev
nodemon ./bin/www

Is this coming from the version of nodejs and npm? I am using the latest version as below:
npm: 6.14.5
node: v12.18.2

Thanks

[JasonBoy]

The medium post was a little bit old, pls check out the readme here in the repo:

const {Wechat} = require('wechat-jssdk');
const wx = new Wechat(wechatConfig);