DEVELOPING FOR MAFIA IN TYPESCRIPT (TS)

Hey all. This is a brief explainer on how to get to a usable TS development environment for KoLMafia. Ideally, this will cover everything you need to make a sample JavaScript mafia script. This was written by a TS novice, so hopefully it properly enumerates everything you need to do to get an environment up and running!

PART ONE - BABY'S FIRST TS COMPILATION

• STEP 1: Download Node.js / NPM. This will allow you to install babel/webpack and set up a compiler. To download, visit the latest node.js build. Then install the package manager, yarn, by opening a terminal and typing: npm install -g yarn. Think of this like immediately installing Chrome or Firefox on a new computer instead of using Internet Explorer.
• STEP 2: Let's set up a sample repository. You can do that using this starter repository right here! To do so, use the terminal to navigate to where you want the repo saved, and call git clone https://github.com/docrostov/kol-ts-starter
  • NOTE: if this command does not work, you probably do not have Git installed on your computer, and will also need to install Git. Please find information on how to do that here.
  • NOTE 2: just doing a straight git clone like this is not recommended in a development context. Please follow the excellent KoL Scripting Resources Guide which covers stuff like forking and pull requests.
• STEP 3: Run yarn install while inside your new directory to install the necessary dependencies, like the Loathing Scripting Society's TS toolkit (LIBRAM) & other KoLMafia TS/JS toolkits. You will need to do this for every project you have, yarn essentially creates an isolated virtual environment for you to work in. This is rather convenient, as you get to avoid version conflicts between your packages!
  • NOTE: It is highly recommended to run yarn upgrade kolmafia@latest, yarn upgrade libram@latest, and yarn upgrade eslint-plugin-libram@latest after running yarn install. This is due to the fact that all three of these tools are upgraded very frequently, and this kol-ts-starter repo is not updated quite as frequently, so the "default" version may be a bit backdated from the most recent version of each package. After running these upgrade commands, if you are coding in VSCode, press Ctrl+Shift+P and then reload your window (the first option that pops up) to make sure the upgraded packages have been applied.
• STEP 4: Let's build the code! Run yarn run build, and you'll see that your folder now has a folder called KoLMafia in it, which in turn has a scripts subfolder. This should look familiar, as that's how the KoLMafia directory is structured. The scripts folder has a kol-ts-starter subfolder, and there you'll find a main-script-name.js file. Copy it into the scripts directory of your KoLMafia installation.
• STEP 5: From the KoLMafia GCLI, run main-script-name.js -- this should generate your MP statement. Congrats, you did the thing!

PART TWO - DIPPING TOES INTO MORE COMPLEX MATTER

• Since you've successfully gotten the code to compile, now we can mess around with some stuff. It is recommended you use VSCode for editing due to its excellent TypeScript support. Once you install VSCode, open it and select the folder with the repository in it. You can also open a terminal within VSCode to save clicks by pressing ctrl+shift+\. For extra credit, you can install some very helpful VS Code extensions: ESLint and Prettier. If you install the latter, your code will auto-format on save!
• A helpful command within yarn is yarn init. This is useful for changing details about the package without needing to manually muck around packages.json and hoping you changed everything correctly. Call yarn init now, and provide a cool name for your package (without any spaces). You will be then asked further questions like what version of the package this is, a description of said package and so on. You can skip any you don't feel like answering by pressing enter.
• Rather than be stuck running yarn run build every time you make an edit, you can instead call yarn watch before you begin working on your code. This process will keep running, and automatically build your code for you whenever you save your file. Convenient!
• Let's modify the code a little bit. The TS code that created the JS file you just ran lives in src/main.ts within the repository. At build, all this code does is tell you how much MP you have relative to the number 200; let's change the print statement to add your name in here. Modify main.ts to include the following, changing "[NAME]" to your name.:

import { myMp, print } from "kolmafia";

export function checkMP(): string {
  if (myMp() < 200) {
    return "Your MP is less than 200, buddy.";
  } else {
    return "Your MP is greater than or equal to 200. Congratulations, [NAME]";
  }
}

export function main(): void {
  print(checkMP());
}

• Rather than manually copying the files every time you build your package, you can create a symlink that will let KoLMafia see the files in your repository folder. Keep in mind that you cannot do ./ completion with symlinks; you need to explicitly list out the entire file path. My symlink command on Mac OS was the following: ln -s "$PWD/KoLmafia/scripts/PACKAGE_NAME ~/Library/Application\ Support/KoLmafia/scripts/ -- Windows and Linux users may need a different approach.
• Once you make the symlink, you can call PACKAGE_NAME/main-script-name.js from the KoLMafia GCLI. Neat!