Try upgrading Yarn to Yarn Modern

.github/workflows/set-up-everything/action.yml

@@ -27,6 +27,5 @@ runs:
         python-version: 3.12.4
 
     - name: Install dependencies
-      # I learned about https://github.com/yarnpkg/yarn/issues/2739 painfully.
-      run: yarn --production=false --frozen-lockfile
+      run: yarn --immutable
       shell: bash

.gitignore

@@ -2,3 +2,11 @@ node_modules/
 yarn-error.log
 
 .DS_Store
+
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions

.yarnrc.yml

@@ -0,0 +1,3 @@
+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-4.4.1-patched.cjs

DEVELOPMENT.md

@@ -7,7 +7,7 @@ This document aims to get you up-and-running developing on this project! If afte
 At a minimum, you will need:
 
 - Node.js, version 20 or higher
-- Yarn 1.\* (i.e. classic Yarn)
+- Yarn 4+
 - a Bash shell
 
 For the most enjoyable development experience, or if you plan to contribute to the [Adventure Pack](workspaces/adventure-pack/), you will additionally need:
@@ -19,7 +19,7 @@ See below for more context on each prerequisite and how to install it.
 
 ### Node
 
-This project is structured as a Node module, using [classic Yarn](https://classic.yarnpkg.com/) as the package manager. So even if you don't intend to write any TypeScript/JavaScript code, it will be beneficial to have a recent version of Node, so you can run the repository management code, which is generally written in TypeScript or JavaScript.
+This project is structured as a Node module, using Yarn as the package manager. So even if you don't intend to write any TypeScript/JavaScript code, it will be beneficial to have a recent version of Node, so you can run the repository management code, which is generally written in TypeScript or JavaScript.
 
 We recommend installing Node using the Node Version Manager (`nvm`). Follow the installation instructions at https://nvm.sh/ then:
 
@@ -33,7 +33,7 @@ node -v
 
 ### Yarn
 
-As mentioned, Yarn (specifically [classic Yarn](https://classic.yarnpkg.com/)) is the package manager we currently use for the TypeScript/JavaScript code. If you have a recent version of Node, you will have access to all the package managers your heart desires, though you may need to enable them using [Corepack](https://nodejs.org/api/corepack.html):
+As mentioned, [Yarn](https://yarnpkg.com/) is the package manager we currently use for the TypeScript/JavaScript code. If you have a recent version of Node, you will have access to all the package managers your heart desires, though you may need to enable them using [Corepack](https://nodejs.org/api/corepack.html):
 
 ```sh
 # The `corepack` command is distributed with Node.

eslint.config.mjs

@@ -3,8 +3,13 @@ import config from "@code-chronicles/eslint-config";
 export default [
   ...config,
   {
-    // Ignore the workspaces directory, it will handle its own linting.
-    // See the "lint" script in `package.json`.
-    ignores: ["workspaces/"],
+    ignores: [
+      // Ignore the workspaces directory, it will handle its own linting.
+      // See the "lint" script in `package.json`.
+      "workspaces/",
+
+      // Minified Yarn code!
+      ".yarn/releases/",
+    ],
   },
 ];

package.json

@@ -18,15 +18,15 @@
     "workspaces/util"
   ],
   "scripts": {
-    "format": "yarn --silent workspace @code-chronicles/repository-scripts start format",
-    "lint": "yarn --silent workspace @code-chronicles/repository-scripts start lint",
-    "test": "yarn --silent workspace @code-chronicles/repository-scripts start test",
-    "typecheck": "yarn --silent workspace @code-chronicles/repository-scripts start typecheck"
+    "format": "yarn workspace @code-chronicles/repository-scripts start format",
+    "lint": "yarn workspace @code-chronicles/repository-scripts start lint",
+    "test": "yarn workspace @code-chronicles/repository-scripts start test",
+    "typecheck": "yarn workspace @code-chronicles/repository-scripts start typecheck"
   },
   "devDependencies": {
     "@code-chronicles/eslint-config": "0.0.1",
     "eslint": "9.9.0",
     "prettier": "3.3.3"
   },
-  "packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
+  "packageManager": "yarn@4.4.1-patched"
 }

workspaces/download-leetcode-submissions/README.md

@@ -77,7 +77,7 @@ As such it's safe to run the script multiple times, without redoing too much wor
 
 ## Development
 
-Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [classic Yarn](https://classic.yarnpkg.com/) as the package manager.
+Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [Yarn](https://yarnpkg.com/) as the package manager.
 
 You can install dependencies by running `yarn`, either in this package's directory, or in the repository root. The usual `yarn format`, `yarn lint`, and `yarn typecheck` scripts are available to aid in development and occasionally to annoy.
 

workspaces/eslint-config/README.md

@@ -20,7 +20,7 @@ export default [...config, { ignores: ["dist/"] }];
 
 ## Development
 
-Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [classic Yarn](https://classic.yarnpkg.com/) as the package manager.
+Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [Yarn](https://yarnpkg.com/) as the package manager.
 
 You can install dependencies by running `yarn`, either in this package's directory, or in the repository root. The usual `yarn format` and `yarn lint` commands are available, but for the time being there is no `yarn typecheck`, since this package is pure JavaScript rather than TypeScript. (However, it hopefully will be [in the near future](https://eslint.org/docs/latest/use/configure/configuration-files#typescript-configuration-files)!)
 

workspaces/fetch-leetcode-problem-list/README.md

@@ -57,7 +57,7 @@ This repository includes [a Github Actions workflow](../../.github/workflows/upd
 
 ## Development
 
-Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [classic Yarn](https://classic.yarnpkg.com/) as the package manager.
+Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [Yarn](https://yarnpkg.com/) as the package manager.
 
 You can install dependencies by running `yarn`, either in this package's directory, or in the repository root. The usual `yarn format`, `yarn lint`, and `yarn typecheck` scripts are available to aid in development and occasionally to annoy. Read more in the repository's general [development guide](../../DEVELOPMENT.md).
 

workspaces/fetch-recent-accepted-leetcode-submissions/README.md

@@ -62,15 +62,15 @@ The output is JSON and will look something like:
 }
 ```
 
-You can redirect it to a file for later consumption. If using `yarn`, add the `--silent` flag to skip any output from Yarn itself:
+You can redirect it to a file for later consumption:
 
 ```sh
-yarn --silent start elimanzo VehicleOfPuzzle > data.json
+yarn start elimanzo VehicleOfPuzzle > data.json
 ```
 
 ## Development
 
-Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [classic Yarn](https://classic.yarnpkg.com/) as the package manager.
+Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [Yarn](https://yarnpkg.com/) as the package manager.
 
 You can install dependencies by running `yarn`, either in this package's directory, or in the repository root. The usual `yarn format`, `yarn lint`, and `yarn typecheck` scripts are available to aid in development and occasionally to annoy. Read more in the repository's general [development guide](../../DEVELOPMENT.md).
 

workspaces/leetcode-api/README.md

@@ -33,7 +33,7 @@ Used to power sibling packages like:
 
 ## Development
 
-Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [classic Yarn](https://classic.yarnpkg.com/) as the package manager.
+Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [Yarn](https://yarnpkg.com/) as the package manager.
 
 You can install dependencies by running `yarn`, either in this package's directory, or in the repository root. The usual `yarn format`, `yarn lint`, and `yarn typecheck` scripts are available to aid in development and occasionally to annoy.
 

workspaces/post-leetcode-potd-to-discord/README.md

@@ -74,7 +74,7 @@ The script also checks that the problem date reported by the LeetCode API matche
 
 ## Development
 
-Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [classic Yarn](https://classic.yarnpkg.com/) as the package manager.
+Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [Yarn](https://yarnpkg.com/) as the package manager.
 
 You can install dependencies by running `yarn`, either in this package's directory, or in the repository root. The usual `yarn format`, `yarn lint`, and `yarn typecheck` scripts are available to aid in development and occasionally to annoy. Read more in the repository's general [development guide](../../DEVELOPMENT.md).
 

workspaces/util/README.md

@@ -16,7 +16,7 @@ console.log(stripPrefix("hello", "how"));
 
 ## Development
 
-Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [classic Yarn](https://classic.yarnpkg.com/) as the package manager.
+Like the rest of the [Code Chronicles Leetcode ecosystem](../../), this package is structured as a Node module, using [Yarn](https://yarnpkg.com/) as the package manager.
 
 You can install dependencies by running `yarn`, either in this package's directory, or in the repository root. The usual `yarn format`, `yarn lint`, and `yarn typecheck` scripts are available to aid in development and occasionally to annoy. `yarn test` is also available, though we could definitely use more tests!
 

workspaces/util/src/readWorkspaces.ts

@@ -1,14 +1,18 @@
 import { assertIsObject } from "@code-chronicles/util/assertIsObject";
+import { assertIsString } from "@code-chronicles/util/assertIsString";
+import { getLines } from "@code-chronicles/util/getLines";
 import { execWithArgsOrThrowOnNzec } from "@code-chronicles/util/execWithArgsOrThrowOnNzec";
 
 export async function readWorkspaces(): Promise<string[]> {
   const yarnCommandResult = await execWithArgsOrThrowOnNzec("yarn", [
-    "--silent",
     "workspaces",
-    "info",
+    "list",
+    "--json",
   ]);
 
-  return Object.keys(
-    assertIsObject(JSON.parse(yarnCommandResult.stdout)),
-  ).sort();
+  return [...getLines(yarnCommandResult.stdout)]
+    .map((line) => assertIsObject(JSON.parse(line)))
+    .filter((workspace) => workspace.location !== ".")
+    .map(({ name }) => assertIsString(name))
+    .sort();
 }