joplin/BUILD.md

Building the applications

• All the applications share the same library, which, for historical reasons, is in ReactNativeClient/lib. This library is copied to the relevant directories when building each app.
• Most of the backend (anything to do with the database, synchronisation, etc.) is shared across all the apps, so when making a change please consider how it will affect all the apps.

Required dependencies

• Install yarn - https://yarnpkg.com/lang/en/docs/install/
• Install node - https://nodejs.org/en/

Building

Before doing anything else, from the root of the project, run:

npm install

Then you can test the various applications:

Testing the desktop application

cd ElectronClient
npm run start

Testing the Terminal application

cd CliClient
npm run start

Testing the Mobile application

First you need to setup React Native to build projects with native code. For this, follow the instructions on the Get Started tutorial, in the "React Native CLI Quickstart" tab.

Then:

cd ReactNativeClient
react-native run-ios
# Or: react-native run-android

To run the iOS application, it might be easier to open the file ios/Joplin.xcworkspace on XCode and run the app from there.

Watching files

To make changes to the application, you'll need to rebuild any TypeScript file you've changed, and rebuild the lib. The simplest way to do all this is to watch for changes from the root of the project. Simply run this command, and it should take care of the rest:

npm run watch

Running npm run build would have the same effect, but without watching.

Running an application with additional parameters

You can specify additional parameters when running the desktop or CLI application. To do so, add -- to the npm run start command, followed by your flags. For example:

npm run start -- --profile ~/MyTestProfile

TypeScript

Most of the application is written in JavaScript, however new classes and files should generally be written in TypeScript. All TypeScript files are generated next to the .ts or .tsx file. So for example, if there's a file "lib/MyClass.ts", there will be a generated "lib/MyClass.js" next to it. It is implemented that way as it requires minimal changes to integrate TypeScript in the existing JavaScript code base.

Troubleshooting desktop application

On Linux and macOS

If there's an error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory, run sudo apt-get install libgconf-2-4

If you get a node-gyp related error, you might need to manually install it: npm install -g node-gyp.

If you get the error libtool: unrecognized option '-static', follow the instructions in this post to use the correct libtool version.

On Windows

If node-gyp does not work (MSBUILD: error MSB3428: Could not load the Visual C++ component "VCBuild.exe"), you might need to install windows-build-tools using npm install --global windows-build-tools.

If yarn dist fails, it may need administrative rights.

If you get an error MSB8020: The build tools for v140 cannot be found. try to run with a different toolset version, eg npm install --toolset=v141 (See here for more info).

The building_win32_tips on this page might be helpful.

Other issues

The application window doesn't open or is white

This is an indication that there's an early initialisation error. Try this:

• In ElectronAppWrapper, set debugEarlyBugs to true. This will force the window to show up and should open the console next to it, which should display any error.
• In more rare cases, an already open instance of Joplin can create strange low-level bugs that will display no error but will result in this white window. A non-dev instance of Joplin, or a dev instance that wasn't properly closed might cause this. So make sure you close everything and try again. Perhaps even other Electron apps running (Skype, Slack, etc.) could cause this?
• Also try to delete node_modules and rebuild.
• If all else fails, switch your computer off and on again, to make sure you start clean.

How to work on the app from Windows?

You should not use WSL at all because this is a GUI app that lives outside of WSL, and the WSL layer can cause all kind of very hard to debug issues. It can also lock files in node_modules that cannot be unlocked when the app crashes. (You need to restart your computer.) Likewise, don't run the TypeScript watch command from WSL.

So everything should be done from a Windows Command prompt or Windows PowerShell running as Administrator. All build and start commands are designed to work cross-platform, including on Windows.