Upgrade to Yarn v3

.gitignore

@@ -1,3 +1,13 @@
 node_modules/
 dist/
 *.log
+
+# yarn v3 (w/o zero-install)
+# See: https://yarnpkg.com/getting-started/qa#which-files-should-be-gitignored
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions

.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

package.json

@@ -16,16 +16,14 @@
     "lint": "eslint . --ext ts,js,json",
     "lint:fix": "yarn lint --fix",
     "build": "./build.sh",
-    "setup": "yarn install && yarn allow-scripts",
-    "prepublishOnly": "yarn build && yarn test && yarn lint"
+    "prepack": "./scripts/prepack.sh"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/MetaMask/detect-provider.git"
   },
   "author": "Erik Marks <rekmarks@protonmail.com>",
   "license": "ISC",
-  "private": false,
   "publishConfig": {
     "access": "public"
   },
@@ -55,10 +53,10 @@
     "tinyify": "^4.0.0",
     "typescript": "^4.0.3"
   },
-  "dependencies": {},
   "lavamoat": {
     "allowScripts": {
       "@lavamoat/preinstall-always-fail": false
     }
-  }
+  },
+  "packageManager": "yarn@3.2.1"
 }

scripts/prepack.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [[ -n $SKIP_PREPACK ]]; then
+  echo "Notice: skipping prepack."
+  exit 0
+fi
+
+yarn build