Contributing to Apps Engine

Being Open Source, we always welcome contributors to help us out develope the ultimate chat platform. You can check out our Apps Engine repository here.
GitHub - RocketChat/Rocket.Chat.Apps-engine: The Rocket.Chat Apps engine and definitions.
GitHub
An awesome place to start is looking at our open issues and determining if you can help us with them.
When developing new functionalities, you need to integrate the local version of the Apps-Engine with your local version of Rocket.Chat.
Get the Apps Engine Code
To start, clone the Apps Engine repository and navigate into the directory by running
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git clone https://github.com/RocketChat/Rocket.Chat.Apps-engine.git
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cd Rocket.Chat.Apps-engine
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Next, install all the required packages and compile the changes since that is what Rocket.Chat itself will execute.
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npm install
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npm run compile
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Setup your Rocket.Chat environment following the guide on 
​https://github.com/RocketChat/developer-docs/blob/master/rocket.chat/rocket.chat-server​
After setting up, navigate into the directory and run
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meteor npm install PATH_TO_APPS_ENGINE
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Where PATH_TO_APPS_ENGINE is the path to the Apps-Engine repo you cloned earlier.
You can now start your Rocket.Chat with the meteor command, it will use your local Apps-Engine instead of the one on NPM :)
Whenever you make changes to the engine, run npm run compile again - meteor will take care of restarting the server due to the changes.
Troubleshooting Apps Engine Development
1.Sometimes, when you update the Apps-Engine code and compile it while Rocket.Chat is running; you run into errors similar to these:
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Unable to resolve some modules:
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​
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  "@rocket.chat/apps-engine/definition/AppStatus" in
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/Users/dev/rocket.chat/Rocket.Chat/app/apps/client/admin/helpers.js (web.browser)
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​
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If you notice problems related to these missing modules, consider running:
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​
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  meteor npm install --save @rocket.chat/apps-engine
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 Restart the meteor process, and it should be fixed.
2. Sometimes when using meteor npm install PATH_TO_APPS_ENGINE  causes the following error :-
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npm ERR! code ENOENT
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npm ERR! syscall rename
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npm ERR! path PATH_TO_ROCKETCHAT/node_modules/.staging/@rocket.chat/apps-engine-c7135600/node_modules/@babel/code-frame
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npm ERR! dest PATH_TO_ROCKETCHAT/node_modules/.staging/@babel/code-frame-f3697825
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npm ERR! errno -2
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npm ERR! enoent ENOENT: no such file or directory, rename 'PATH_TO_ROCKETCHAT/node_modules/.staging/@rocket.chat/apps-engine-c7135600/node_modules/@babel/code-frame' -> 'PATH_TO_ROCKETCHAT/node_modules/.staging/@babel/code-frame-f3697825'
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npm ERR! enoent This is related to npm not being able to find a file.
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npm ERR! enoent 
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Here PATH_TO_ROCKETCHAT is the path to the main Rocket.Chat server repo in your system. To fix this, we reinstall the package once again and delete the previous package
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~/Rocket.Chat$ rm -rf node_modules/@rocket.chat/apps-engine
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~/Rocket.Chat$ cd PATH_TO_APP_ENGINE
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~/Rocket.Chat.Apps-engine$ npm install
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~/Rocket.Chat.Apps-engine$ cd PATH_TO_ROCKETCHAT
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~/Rocket.Chat$ meteor npm install ../Rocket.Chat.Apps-engine
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Apps Engine Environment Setup

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Getting Started

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Get the Apps Engine Code

Troubleshooting Apps Engine Development