chore: Convert to monorepo

.depcheckrc.yml

@@ -0,0 +1,15 @@
+---
+ignores:
+  - '@arethetypeswrong/cli'
+  - '@lavamoat/allow-scripts'
+  - '@lavamoat/preinstall-always-fail'
+  - '@metamask/auto-changelog'
+  - '@ts-bridge/cli'
+  - '@ts-bridge/shims'
+  - '@types/jest'
+  - '@types/node'
+  - '@yarnpkg/*'
+  - 'jest-silent-reporter'
+  - 'prettier-plugin-*'
+  - 'ts-jest'
+  - 'typedoc'

.eslintrc.js

@@ -1,50 +1,116 @@
 module.exports = {
   root: true,
 
-  extends: ['@metamask/eslint-config'],
+  extends: ['@metamask/eslint-config', '@metamask/eslint-config-nodejs'],
+
+  parserOptions: {
+    tsconfigRootDir: __dirname,
+  },
+
+  env: {
+    'shared-node-browser': true,
+  },
+
+  ignorePatterns: [
+    '!.eslintrc.js',
+    '!jest.config.js',
+    'node_modules',
+    '**/dist',
+    '**/docs',
+    '**/coverage',
+  ],
+
+  rules: {
+    // This prevents importing Node.js builtins. We currently use them in
+    // our codebase, so this rule is disabled. This rule should be disabled
+    // in `@metamask/eslint-config-nodejs` in the future.
+    'import/no-nodejs-modules': 'off',
+
+    // This prevents using Node.js and/or browser specific globals. We
+    // currently use both in our codebase, so this rule is disabled.
+    'no-restricted-globals': 'off',
+  },
 
   overrides: [
+    {
+      files: ['*.js'],
+      parserOptions: {
+        sourceType: 'script',
+        ecmaVersion: '2020',
+      },
+    },
+
     {
       files: ['*.ts'],
       extends: ['@metamask/eslint-config-typescript'],
+      parserOptions: {
+        tsconfigRootDir: __dirname,
+        project: ['./tsconfig.packages.json'],
+      },
+      rules: {
+        // Enable rules that are disabled in `@metamask/eslint-config-typescript`
+        '@typescript-eslint/no-explicit-any': 'error',
+
+        // TODO: auto-fix breaks stuff
+        '@typescript-eslint/promise-function-async': 'off',
+
+        // Without the `allowAny` option, this rule causes a lot of false
+        // positives.
+        '@typescript-eslint/restrict-template-expressions': [
+          'error',
+          {
+            allowAny: true,
+            allowBoolean: true,
+            allowNumber: true,
+          },
+        ],
+      },
     },
 
     {
-      files: ['*.js'],
-      parserOptions: {
-        sourceType: 'script',
+      files: ['*.d.ts'],
+      rules: {
+        'import/unambiguous': 'off',
       },
-      extends: ['@metamask/eslint-config-nodejs'],
     },
 
     {
-      files: ['yarn.config.cjs'],
-      parserOptions: {
-        sourceType: 'script',
-        ecmaVersion: 2020,
+      files: ['scripts/*.ts'],
+      rules: {
+        // All scripts will have shebangs.
+        'n/shebang': 'off',
       },
-      settings: {
-        jsdoc: {
-          mode: 'typescript',
-        },
+    },
+
+    {
+      files: ['**/jest.environment.js'],
+      rules: {
+        // These files run under Node, and thus `require(...)` is expected.
+        'n/global-require': 'off',
       },
-      extends: ['@metamask/eslint-config-nodejs'],
     },
 
     {
-      files: ['*.test.ts', '*.test.js'],
-      extends: [
-        '@metamask/eslint-config-jest',
-        '@metamask/eslint-config-nodejs',
-      ],
+      files: ['*.test.{ts,js}', '**/tests/**/*.{ts,js}'],
+      extends: ['@metamask/eslint-config-jest'],
+      rules: {
+        '@typescript-eslint/no-shadow': [
+          'error',
+          { allow: ['describe', 'expect', 'it'] },
+        ],
+      },
     },
-  ],
 
-  ignorePatterns: [
-    '!.eslintrc.js',
-    '!.prettierrc.js',
-    'dist/',
-    'docs/',
-    '.yarn/',
+    {
+      // These files are test helpers, not tests. We still use the Jest ESLint
+      // config here to ensure that ESLint expects a test-like environment, but
+      // various rules meant just to apply to tests have been disabled.
+      files: ['**/tests/**/*.{ts,js}', '!*.test.{ts,js}'],
+      rules: {
+        'jest/no-export': 'off',
+        'jest/require-top-level-describe': 'off',
+        'jest/no-if': 'off',
+      },
+    },
   ],
 };