feat: Introduce streams package

.depcheckrc.yml

@@ -11,5 +11,6 @@ ignores:
   - 'jsdom'
   - 'prettier-plugin-*'
   - 'typedoc'
+  - 'vite-tsconfig-paths'
   - 'vite'
   - 'vitest'

.eslintrc.js → .eslintrc.cjs

@@ -12,7 +12,7 @@ module.exports = {
   },
 
   ignorePatterns: [
-    '!.eslintrc.js',
+    '!.eslintrc.cjs',
     '!vite.config.mts',
     '!vitest.config.mts',
     'node_modules',
@@ -27,22 +27,30 @@ module.exports = {
     // in `@metamask/eslint-config-nodejs` in the future.
     'import/no-nodejs-modules': 'off',
 
+    'import/no-useless-path-segments': [
+      'error',
+      {
+        // Enabling this causes false errors in ESM files.
+        noUselessIndex: false,
+      },
+    ],
+
     // 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', '*.cjs'],
+      files: ['*.cjs'],
       parserOptions: {
         sourceType: 'script',
         ecmaVersion: '2020',
       },
     },
 
     {
-      files: ['*.mjs'],
+      files: ['*.js', '*.mjs'],
       parserOptions: {
         sourceType: 'module',
         ecmaVersion: '2020',
@@ -70,8 +78,8 @@ module.exports = {
       rules: {
         '@typescript-eslint/no-explicit-any': 'error',
 
-        // This rule is broken, and without the `allowAny` option, it causes
-        // a lot of false positives.
+        // This rule is broken, and without the `allowAny` option, it reports a lot
+        // of false errors.
         '@typescript-eslint/restrict-template-expressions': [
           'error',
           {
@@ -98,6 +106,15 @@ module.exports = {
       },
     },
 
+    {
+      // Overrides of overrides.
+      files: ['*'],
+      rules: {
+        // This prevents pretty formatting of comments with multi-line lists entries.
+        'jsdoc/check-indentation': 'off',
+      },
+    },
+
     {
       // @metamask/eslint-plugin-vitest does not exist, so this is copied from the
       // jest-equivalent. All of the rules we specify are the same. Ref:

constraints.pro

@@ -209,9 +209,11 @@ gen_enforced_field(WorkspaceCwd, 'module', './dist/index.mjs') :-
 % Non-published packages must not specify an entrypoint.
 gen_enforced_field(WorkspaceCwd, 'main', null) :-
   WorkspaceCwd \= 'packages/shims',
+  WorkspaceCwd \= 'packages/streams',
   workspace_field(WorkspaceCwd, 'private', true).
 gen_enforced_field(WorkspaceCwd, 'module', null) :-
   WorkspaceCwd \= 'packages/shims',
+  WorkspaceCwd \= 'packages/streams',
   workspace_field(WorkspaceCwd, 'private', true).
 
 % The type definitions entrypoint for all publishable packages must be the same.
@@ -220,6 +222,7 @@ gen_enforced_field(WorkspaceCwd, 'types', './dist/index.d.cts') :-
 % Non-published packages must not specify a type definitions entrypoint.
 gen_enforced_field(WorkspaceCwd, 'types', null) :-
   WorkspaceCwd \= 'packages/shims',
+  WorkspaceCwd \= 'packages/streams',
   workspace_field(WorkspaceCwd, 'private', true).
 
 % The exports for all published packages must be the same.
@@ -235,18 +238,19 @@ gen_enforced_field(WorkspaceCwd, 'exports["."].import.types', './dist/index.d.mt
   \+ workspace_field(WorkspaceCwd, 'private', true).
 % package.json
 gen_enforced_field(WorkspaceCwd, 'exports["./package.json"]', './package.json') :-
-  \+ workspace_field(WorkspaceCwd, 'private', true).
-% Non-published packages must not specify exports.
+  WorkspaceCwd \= 'packages/extension',
+  WorkspaceCwd \= '.'.
+% The root package must not specify exports.
 gen_enforced_field(WorkspaceCwd, 'exports', null) :-
-  WorkspaceCwd \= 'packages/shims',
-  workspace_field(WorkspaceCwd, 'private', true).
+  WorkspaceCwd = '.'.
 
 % Published packages must not have side effects.
 gen_enforced_field(WorkspaceCwd, 'sideEffects', false) :-
   \+ workspace_field(WorkspaceCwd, 'private', true).
 % Non-published packages must not specify side effects.
 gen_enforced_field(WorkspaceCwd, 'sideEffects', null) :-
   WorkspaceCwd \= 'packages/shims',
+  WorkspaceCwd \= 'packages/streams',
   workspace_field(WorkspaceCwd, 'private', true).
 
 % The list of files included in published packages must only include files
@@ -265,9 +269,14 @@ gen_enforced_field(WorkspaceCwd, 'files', []) :-
 % gen_enforced_field(WorkspaceCwd, 'scripts.build', '') :-
 %   WorkspaceCwd \= '.'.
 
-% All packages except the root and extension must have the same "build:docs" script.
+% All packages except the root and other exceptions must have the same "build:docs" script.
 gen_enforced_field(WorkspaceCwd, 'scripts.build:docs', 'typedoc') :-
   WorkspaceCwd \= 'packages/extension',
+  WorkspaceCwd \= 'packages/test-utils',
+  WorkspaceCwd \= '.'.
+
+% All packages except the root must have the same "clean" script.
+gen_enforced_field(WorkspaceCwd, 'scripts.clean', 'rimraf ./dist \'./*.tsbuildinfo\'') :-
   WorkspaceCwd \= '.'.
 
 % All published packages must have the same "publish:preview" script.
@@ -301,53 +310,56 @@ gen_enforced_field(WorkspaceCwd, 'scripts.changelog:update', CorrectChangelogUpd
 % All non-root packages must have the same "test" script.
 gen_enforced_field(WorkspaceCwd, 'scripts.test', 'vitest run --config vitest.config.mts') :-
   WorkspaceCwd \= 'packages/shims',
+  WorkspaceCwd \= 'packages/test-utils',
   WorkspaceCwd \= '.'.
 
 % All non-root packages must have the same "test:clean" script.
 gen_enforced_field(WorkspaceCwd, 'scripts.test:clean', 'yarn test --no-cache --coverage.clean') :-
+  WorkspaceCwd \= 'packages/test-utils',
   WorkspaceCwd \= '.'.
 
 % All non-root packages must have the same "test:dev" script.
 gen_enforced_field(WorkspaceCwd, 'scripts.test:dev', 'yarn test --coverage false') :-
+  WorkspaceCwd \= 'packages/test-utils',
   WorkspaceCwd \= '.'.
 
 % All non-root packages must have the same "test:verbose" script.
 gen_enforced_field(WorkspaceCwd, 'scripts.test:verbose', 'yarn test --reporter verbose') :-
+  WorkspaceCwd \= 'packages/test-utils',
   WorkspaceCwd \= '.'.
 
 % All non-root packages must have the same "test:watch" script.
 gen_enforced_field(WorkspaceCwd, 'scripts.test:watch', 'vitest --config vitest.config.mts') :-
+  WorkspaceCwd \= 'packages/test-utils',
   WorkspaceCwd \= '.'.
 
 % All dependency ranges must be recognizable (this makes it possible to apply
 % the next two rules effectively).
 gen_enforced_dependency(WorkspaceCwd, DependencyIdent, 'a range optionally starting with ^ or ~', DependencyType) :-
   workspace_has_dependency(WorkspaceCwd, DependencyIdent, DependencyRange, DependencyType),
-  \+ is_valid_version_range(DependencyRange).
-
-% All version ranges used to reference one workspace package in another
-% workspace package's `dependencies` or `devDependencies` must be the same.
-% Among all references to the same dependency across the monorepo, the one with
-% the smallest version range will win. (We handle `peerDependencies` in another
-% constraint, as it has slightly different logic.)
+  \+ (
+      DependencyRange = '^1.0.0-rc.12'; % is_valid_version_range does not handle rc suffixes
+      is_valid_version_range(DependencyRange)
+    ).
+
+% All dependency ranges for a package must be synchronized across the monorepo
+% (the least version range wins), regardless of which "*dependencies" field
+% where the package appears.
 gen_enforced_dependency(WorkspaceCwd, DependencyIdent, OtherDependencyRange, DependencyType) :-
   workspace_has_dependency(WorkspaceCwd, DependencyIdent, DependencyRange, DependencyType),
   workspace_has_dependency(OtherWorkspaceCwd, DependencyIdent, OtherDependencyRange, OtherDependencyType),
   WorkspaceCwd \= OtherWorkspaceCwd,
   DependencyRange \= OtherDependencyRange,
-  npm_version_range_out_of_sync(DependencyRange, OtherDependencyRange),
-  DependencyType \= 'peerDependencies',
-  OtherDependencyType \= 'peerDependencies'.
-
-% All version ranges used to reference one workspace package in another
-% workspace package's `dependencies` or `devDependencies` must match the current
-% version of that package. (We handle `peerDependencies` in another rule.)
-gen_enforced_dependency(WorkspaceCwd, DependencyIdent, CorrectDependencyRange, DependencyType) :-
-  DependencyType \= 'peerDependencies',
+  npm_version_range_out_of_sync(DependencyRange, OtherDependencyRange).
+
+% If a dependency is listed under "dependencies", it should not be listed under
+% "devDependencies". We match on the same dependency range so that if a
+% dependency is listed under both lists, their versions are synchronized and
+% then this constraint will apply and remove the "right" duplicate.
+gen_enforced_dependency(WorkspaceCwd, DependencyIdent, null, DependencyType) :-
+  workspace_has_dependency(WorkspaceCwd, DependencyIdent, DependencyRange, 'dependencies'),
   workspace_has_dependency(WorkspaceCwd, DependencyIdent, DependencyRange, DependencyType),
-  workspace_ident(OtherWorkspaceCwd, DependencyIdent),
-  workspace_version(OtherWorkspaceCwd, OtherWorkspaceVersion),
-  atomic_list_concat(['^', OtherWorkspaceVersion], CorrectDependencyRange).
+  DependencyType == 'devDependencies'.
 
 % If a workspace package is listed under another workspace package's
 % `dependencies`, it should not also be listed under its `devDependencies`.

package.json

@@ -6,6 +6,7 @@
     "type": "git",
     "url": "https://github.com/MetaMask/ocap-kernel.git"
   },
+  "type": "module",
   "files": [],
   "workspaces": [
     "packages/*"
@@ -19,13 +20,13 @@
     "build:watch": "yarn run build --watch",
     "changelog:update": "yarn workspaces foreach --all --no-private --parallel --interlaced --verbose run changelog:update",
     "changelog:validate": "yarn workspaces foreach --all --no-private --parallel --interlaced --verbose run changelog:validate",
-    "clean": "rimraf dist '**/*.tsbuildinfo'",
+    "clean": "rimraf '**/*.tsbuildinfo' && yarn workspaces foreach --all --parallel --interlaced --verbose run clean",
     "lint": "yarn lint:eslint && yarn lint:misc --check && yarn constraints && yarn lint:dependencies",
     "lint:dependencies": "depcheck && yarn dedupe --check",
     "lint:dependencies:fix": "depcheck && yarn dedupe",
     "lint:eslint": "eslint . --cache --ext js,mjs,cjs,ts,mts,cts",
     "lint:fix": "yarn lint:eslint --fix && yarn lint:misc --write && yarn constraints --fix && yarn lint:dependencies:fix",
-    "lint:misc": "prettier '**/*.json' '**/*.md' '!**/CHANGELOG.old.md' '**/*.yml' '!.yarnrc.yml' '!merged-packages/**' --ignore-path .gitignore",
+    "lint:misc": "prettier '**/*.json' '**/*.md' '**/*.html' '!**/CHANGELOG.old.md' '**/*.yml' '!.yarnrc.yml' '!merged-packages/**' --ignore-path .gitignore",
     "prepack": "./scripts/prepack.sh",
     "test": "yarn workspaces foreach --all --parallel --verbose run test",
     "test:clean": "yarn workspaces foreach --all --parallel --verbose run test:clean && yarn test",
@@ -39,7 +40,7 @@
     "@metamask/eslint-config": "^12.2.0",
     "@metamask/eslint-config-nodejs": "^12.1.0",
     "@metamask/eslint-config-typescript": "^12.1.0",
-    "@ts-bridge/cli": "^0.1.4",
+    "@ts-bridge/cli": "^0.3.0",
     "@ts-bridge/shims": "^0.1.1",
     "@types/node": "^18.18.14",
     "@typescript-eslint/eslint-plugin": "^5.43.0",
@@ -60,7 +61,8 @@
     "typedoc": "^0.24.8",
     "typescript": "~4.9.5",
     "vite": "^5.3.5",
-    "vitest": "^2.0.4"
+    "vite-tsconfig-paths": "^4.3.2",
+    "vitest": "^2.0.5"
   },
   "packageManager": "yarn@4.2.2",
   "engines": {

packages/extension/.eslintrc.js → packages/extension/.eslintrc.cjs

@@ -1,5 +1,5 @@
 module.exports = {
-  extends: ['../../.eslintrc.js'],
+  extends: ['../../.eslintrc.cjs'],
 
   overrides: [
     {

packages/extension/package.json

@@ -7,6 +7,7 @@
     "type": "git",
     "url": "https://github.com/MetaMask/ocap-kernel.git"
   },
+  "type": "module",
   "files": [
     "dist/"
   ],
@@ -15,6 +16,7 @@
     "build:types": "tsc --project tsconfig.build.json",
     "build:vite": "vite build --config vite.config.mts",
     "changelog:validate": "../../scripts/validate-changelog.sh @ocap/extension",
+    "clean": "rimraf ./dist './*.tsbuildinfo'",
     "publish:preview": "yarn npm publish --tag preview",
     "start": "vite --config vite.config.mts & vite build --watch --config vite.config.mts",
     "test": "vitest run --config vitest.config.mts",
@@ -28,22 +30,26 @@
     "@endo/promise-kit": "^1.1.2",
     "@metamask/snaps-utils": "^7.8.0",
     "@metamask/utils": "^9.1.0",
-    "@ocap/shims": "^0.0.0",
-    "ses": "^1.5.0"
+    "@ocap/shims": "workspace:^",
+    "@ocap/streams": "workspace:^",
+    "ses": "^1.7.0"
   },
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.15.3",
     "@metamask/auto-changelog": "^3.4.4",
+    "@ocap/test-utils": "workspace:^",
     "@types/chrome": "^0.0.268",
-    "@vitest/coverage-v8": "^2.0.4",
+    "@vitest/coverage-v8": "^2.0.5",
+    "cheerio": "^1.0.0-rc.12",
     "deepmerge": "^4.3.1",
     "jsdom": "^24.1.1",
+    "prettier": "^2.7.1",
     "typedoc": "^0.24.8",
     "typedoc-plugin-missing-exports": "^2.0.0",
     "typescript": "~4.9.5",
     "vite": "^5.3.5",
     "vite-plugin-static-copy": "^1.0.6",
-    "vitest": "^2.0.4"
+    "vitest": "^2.0.5"
   },
   "engines": {
     "node": "^18.18 || >=20"

packages/extension/src/background.ts

@@ -3,8 +3,8 @@ import './dev-console.mjs';
 import './endoify.mjs';
 /* eslint-enable import/extensions,import/no-unassigned-import */
 
-import type { ExtensionMessage } from './shared';
-import { Command, makeHandledCallback } from './shared';
+import type { ExtensionMessage } from './shared.js';
+import { Command, makeHandledCallback } from './shared.js';
 
 // globalThis.kernel will exist due to dev-console.mjs
 Object.defineProperties(globalThis.kernel, {