Upgrade from Yarn v1 to v3

.yarn/plugins/@yarnpkg/plugin-allow-scripts.cjs

@@ -0,0 +1,9 @@
+/* eslint-disable */
+//prettier-ignore
+module.exports = {
+name: "@yarnpkg/plugin-allow-scripts",
+factory: function (require) {
+var plugin=(()=>{var a=Object.create,l=Object.defineProperty;var i=Object.getOwnPropertyDescriptor;var s=Object.getOwnPropertyNames;var p=Object.getPrototypeOf,c=Object.prototype.hasOwnProperty;var u=e=>l(e,"__esModule",{value:!0});var f=e=>{if(typeof require!="undefined")return require(e);throw new Error('Dynamic require of "'+e+'" is not supported')};var g=(e,o)=>{for(var r in o)l(e,r,{get:o[r],enumerable:!0})},m=(e,o,r)=>{if(o&&typeof o=="object"||typeof o=="function")for(let t of s(o))!c.call(e,t)&&t!=="default"&&l(e,t,{get:()=>o[t],enumerable:!(r=i(o,t))||r.enumerable});return e},x=e=>m(u(l(e!=null?a(p(e)):{},"default",e&&e.__esModule&&"default"in e?{get:()=>e.default,enumerable:!0}:{value:e,enumerable:!0})),e);var k={};g(k,{default:()=>d});var n=x(f("@yarnpkg/shell")),y={hooks:{afterAllInstalled:async()=>{let e=await(0,n.execute)("yarn run allow-scripts");e!==0&&process.exit(e)}}},d=y;return k;})();
+return plugin;
+}
+};

.yarnrc.yml

@@ -0,0 +1,17 @@
+enableScripts: false
+
+enableTelemetry: 0
+
+logFilters:
+  - code: YN0004
+    level: discard
+
+nodeLinker: node-modules
+
+plugins:
+  - path: .yarn/plugins/@yarnpkg/plugin-allow-scripts.cjs
+    spec: "https://raw.githubusercontent.com/LavaMoat/LavaMoat/main/packages/yarn-plugin-allow-scripts/bundles/@yarnpkg/plugin-allow-scripts.js"
+  - path: .yarn/plugins/@yarnpkg/plugin-constraints.cjs
+    spec: "@yarnpkg/plugin-constraints"
+
+yarnPath: .yarn/releases/yarn-3.2.1.cjs

README.md

@@ -24,9 +24,8 @@ _Add examples here_
 
 - Install [Node.js](https://nodejs.org) version 14
   - If you are using [nvm](https://github.com/creationix/nvm#installation) (recommended) running `nvm use` will automatically choose the right node version for you.
-- Install [Yarn v1](https://yarnpkg.com/en/docs/install)
-- Run `yarn setup` to install dependencies and run any requried post-install scripts
-  - **Warning:** Do not use the `yarn` / `yarn install` command directly. Use `yarn setup` instead. The normal install command will skip required post-install scripts, leaving your development environment in an invalid state.
+- Install [Yarn v3](https://yarnpkg.com/getting-started/install)
+- Run `yarn install` to install dependencies and run any required post-install scripts
 
 ### Testing and Linting
 

package.json

@@ -19,9 +19,8 @@
     "lint": "yarn lint:eslint && yarn lint:misc --check",
     "lint:eslint": "eslint . --cache --ext js,ts",
     "lint:fix": "yarn lint:eslint --fix && yarn lint:misc --write",
-    "lint:misc": "prettier '**/*.json' '**/*.md' '!CHANGELOG.md' '**/*.yml' --ignore-path .gitignore",
-    "prepublishOnly": "yarn build:clean && yarn lint && yarn test",
-    "setup": "yarn install && yarn allow-scripts",
+    "lint:misc": "prettier '**/*.json' '**/*.md' '!CHANGELOG.md' '**/*.yml' '!.yarnrc.yml' --ignore-path .gitignore",
+    "prepack": "./scripts/prepack.sh",
     "test": "jest",
     "test:watch": "jest --watchAll"
   },
@@ -63,6 +62,7 @@
     "ts-jest": "^26.5.6",
     "typescript": "~4.4.4"
   },
+  "packageManager": "yarn@3.2.1",
   "engines": {
     "node": ">=14.0.0"
   },

scripts/prepack.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -x
+set -e
+set -o pipefail
+
+if [[ -n $SKIP_PREPACK ]]; then
+  echo "Notice: skipping prepack."
+  exit 0
+fi
+
+yarn build:clean