require extensions

packages/browser/.eslintrc.cjs

@@ -1,31 +1,31 @@
 module.exports = {
-  root: true,
+  extends: [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:expect-type/recommended",
+    "plugin:require-extensions/recommended"
+  ],
   parser: "@typescript-eslint/parser",
-  overrides: [
-    {
-      files: ["*.ts"],
-      plugins: ["@typescript-eslint", "eslint-plugin-expect-type"],
-      parserOptions: {
-        EXPERIMENTAL_useProjectService: true,
-        project: true,
-        tsconfigRootDir: __dirname
-      },
-      extends: [
-        "eslint:recommended",
-        "plugin:@typescript-eslint/recommended",
-        "plugin:expect-type/recommended"
-      ],
-      rules: {
-        "@typescript-eslint/no-unused-vars": [
-          "warn",
-          {
-            argsIgnorePattern: "^_",
-            varsIgnorePattern: "^_",
-            caughtErrorsIgnorePattern: "^_"
-          }
-        ],
-        "expect-type/expect": "error"
+  parserOptions: {
+    EXPERIMENTAL_useProjectService: true,
+    project: true,
+    tsconfigRootDir: __dirname
+  },
+  plugins: [
+    "@typescript-eslint",
+    "eslint-plugin-expect-type",
+    "require-extensions"
+  ],
+  root: true,
+  rules: {
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      {
+        argsIgnorePattern: "^_",
+        varsIgnorePattern: "^_",
+        caughtErrorsIgnorePattern: "^_"
       }
-    }
-  ]
+    ],
+    "expect-type/expect": "error"
+  }
 };

packages/browser/package.json

@@ -11,9 +11,11 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
+    "prebuild": "bun clean",
     "build": "tsc --project tsconfig-build.json",
     "clean": "rm -rf node_modules build",
     "eslint": "eslint src",
+    "eslint-fix": "eslint src --fix",
     "prettier": "prettier --check --ignore-path .gitignore .",
     "prettier-fix": "prettier --write --ignore-path .gitignore .",
     "test": "web-test-runner"
@@ -28,6 +30,7 @@
     "@web/test-runner-playwright": "^0.11.0",
     "eslint": "^8.51.0",
     "eslint-plugin-expect-type": "^0.2.3",
+    "eslint-plugin-require-extensions": "^0.1.3",
     "prettier": "^3.0.3",
     "sinon": "^17.0.1",
     "typescript": "^5.3.3"

packages/browser/src/BrowserSocket/BrowserSocket.test.ts

@@ -8,12 +8,12 @@ import {
   fromEvent
 } from "@daniel-nagy/transporter/Observable";
 
-import * as BrowserSocket from "./BrowserSocket";
-import * as BrowserSocketServer from "./BrowserSocketServer";
-import * as Error from "./Error";
-import * as Message from "./Message";
-import * as State from "./State";
-import * as Test from "../Test";
+import * as BrowserSocket from './BrowserSocket.js';
+import * as BrowserSocketServer from './BrowserSocketServer.js';
+import * as Error from './Error.js';
+import * as Message from './Message.js';
+import * as State from './State.js';
+import * as Test from '../Test.js';
 
 const { test } = Test;
 

packages/browser/src/BrowserSocket/BrowserSocket.ts

@@ -16,10 +16,10 @@ import {
   timeout as within
 } from "@daniel-nagy/transporter/Observable";
 
-import * as Error from "./Error";
-import * as Message from "./Message";
-import * as State from "./State";
-import * as StructuredCloneable from "../StructuredCloneable";
+import * as Error from './Error.js';
+import * as Message from './Message.js';
+import * as State from './State.js';
+import * as StructuredCloneable from '../StructuredCloneable.js';
 
 export { BrowserSocket as t };
 

packages/browser/src/BrowserSocket/BrowserSocketServer.ts

@@ -11,9 +11,9 @@ import {
   tap
 } from "@daniel-nagy/transporter/Observable";
 
-import * as BrowserSocket from "./BrowserSocket";
-import * as Message from "./Message";
-import * as StructuredCloneable from "../StructuredCloneable";
+import * as BrowserSocket from './BrowserSocket.js';
+import * as Message from './Message.js';
+import * as StructuredCloneable from '../StructuredCloneable.js';
 
 export { BrowserSocketServer as t };
 

packages/browser/src/BrowserSocket/Message.ts

@@ -1,5 +1,5 @@
 import * as Object from "@daniel-nagy/transporter/Object";
-import * as StructuredCloneable from "../StructuredCloneable";
+import * as StructuredCloneable from '../StructuredCloneable.js';
 
 export enum Type {
   Connect = "Connect",

packages/browser/src/BrowserSocket/State.ts

@@ -1,4 +1,4 @@
-import * as Error from "./Error";
+import * as Error from './Error.js';
 
 export enum Type {
   Connecting = "Connecting",

packages/browser/src/StructuredCloneable.test.ts

@@ -4,10 +4,10 @@ import { Observable } from "@daniel-nagy/transporter/Observable/Observable";
 import * as Cache from "@daniel-nagy/transporter/Cache";
 import * as Injector from "@daniel-nagy/transporter/Injector";
 import * as Session from "@daniel-nagy/transporter/Protocol/Session";
-import * as StructuredCloneable from "./StructuredCloneable";
+import * as StructuredCloneable from './StructuredCloneable.js';
 import * as Subprotocol from "@daniel-nagy/transporter/Protocol/Subprotocol";
 
-import { test } from "./Test";
+import { test } from './Test.js';
 
 describe("remote function call", () => {
   test("calling a function", async () => {

packages/browser/src/StructuredCloneable.typetest.ts

@@ -1,8 +1,8 @@
 // These path imports are a workaround for https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/issues/101.
-import * as Injector from "../../../node_modules/@daniel-nagy/transporter/build/Injector";
-import * as Session from "../../../node_modules/@daniel-nagy/transporter/build/Protocol/Session";
-import * as StructuredCloneable from "./StructuredCloneable";
-import * as Subprotocol from "../../../node_modules/@daniel-nagy/transporter/build/Protocol/Subprotocol";
+import * as Injector from '../../../node_modules/@daniel-nagy/transporter/build/Injector.js';
+import * as Session from '../../../node_modules/@daniel-nagy/transporter/build/Protocol/Session.js';
+import * as StructuredCloneable from './StructuredCloneable.js';
+import * as Subprotocol from '../../../node_modules/@daniel-nagy/transporter/build/Protocol/Subprotocol.js';
 
 const protocol = Subprotocol.init({
   connectionMode: Subprotocol.ConnectionMode.ConnectionOriented,

packages/core/.eslintrc.cjs

@@ -1,32 +1,32 @@
 module.exports = {
-  root: true,
+  extends: [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:expect-type/recommended",
+    "plugin:require-extensions/recommended"
+  ],
   parser: "@typescript-eslint/parser",
-  overrides: [
-    {
-      files: ["*.ts"],
-      plugins: ["@typescript-eslint", "eslint-plugin-expect-type"],
-      parserOptions: {
-        EXPERIMENTAL_useProjectService: true,
-        project: true,
-        tsconfigRootDir: __dirname
-      },
-      extends: [
-        "eslint:recommended",
-        "plugin:@typescript-eslint/recommended",
-        "plugin:expect-type/recommended"
-      ],
-      rules: {
-        "@typescript-eslint/no-namespace": "off",
-        "@typescript-eslint/no-unused-vars": [
-          "warn",
-          {
-            argsIgnorePattern: "^_",
-            varsIgnorePattern: "^_",
-            caughtErrorsIgnorePattern: "^_"
-          }
-        ],
-        "expect-type/expect": "error"
+  parserOptions: {
+    EXPERIMENTAL_useProjectService: true,
+    project: true,
+    tsconfigRootDir: __dirname
+  },
+  plugins: [
+    "@typescript-eslint",
+    "eslint-plugin-expect-type",
+    "require-extensions"
+  ],
+  root: true,
+  rules: {
+    "@typescript-eslint/no-namespace": "off",
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      {
+        argsIgnorePattern: "^_",
+        varsIgnorePattern: "^_",
+        caughtErrorsIgnorePattern: "^_"
       }
-    }
-  ]
+    ],
+    "expect-type/expect": "error"
+  }
 };

packages/core/package.json

@@ -20,9 +20,11 @@
     "registry": "https://registry.npmjs.org"
   },
   "scripts": {
+    "prebuild": "bun clean",
     "build": "tsc --project tsconfig-build.json",
     "clean": "rm -rf node_modules build",
     "eslint": "eslint src",
+    "eslint-fix": "eslint src --fix",
     "prettier": "prettier --check --ignore-path .gitignore .",
     "prettier-fix": "prettier --write --ignore-path .gitignore .",
     "test": "bun test"
@@ -35,6 +37,7 @@
     "bun-types": "^1.0.6",
     "eslint": "^8.51.0",
     "eslint-plugin-expect-type": "^0.2.3",
+    "eslint-plugin-require-extensions": "^0.1.3",
     "prettier": "^3.0.3",
     "tinyspy": "^2.2.0",
     "typescript": "^5.3.3"

packages/core/src/Cache.test.ts

@@ -1,7 +1,7 @@
 import { expect, test } from "bun:test";
 import { spy } from "tinyspy";
 
-import * as Cache from "./Cache";
+import * as Cache from './Cache.js';
 
 test("memoizing a function", () => {
   const fn = spy(() => ({ ok: "👌" }));

packages/core/src/Cache.ts

@@ -1,5 +1,5 @@
-import * as Function from "./Function";
-import * as Json from "./Json";
+import * as Function from "./Function.js";
+import * as Json from "./Json.js";
 
 export { Cache as t };
 

packages/core/src/Fiber.test.ts

@@ -1,7 +1,7 @@
 import { expect, test } from "bun:test";
 import { spy } from "tinyspy";
 
-import * as Fiber from "./Fiber";
+import * as Fiber from './Fiber.js';
 
 test("a fiber is active when created", () => {
   expect(Fiber.init().state).toBe(Fiber.State.Active);

packages/core/src/Fiber.ts

@@ -1,4 +1,4 @@
-import { BehaviorSubject } from "./Observable";
+import { BehaviorSubject } from "./Observable/index.js";
 
 export { Fiber as t };
 

packages/core/src/Injector.ts

@@ -1,6 +1,6 @@
-import * as Array from "./Array";
-import * as Function from "./Function";
-import * as Object from "./Object";
+import * as Array from "./Array.js";
+import * as Function from "./Function.js";
+import * as Object from "./Object.js";
 
 export { Injector as t };
 

packages/core/src/Injector.typetest.ts

@@ -1,4 +1,4 @@
-import * as Injector from "./Injector";
+import * as Injector from "./Injector.js";
 
 describe("using the Injector", () => {
   test("adding a value to the Injector", () => {

packages/core/src/Json.ts

@@ -1,5 +1,5 @@
-import * as Array from "./Array";
-import * as Object from "./Object";
+import * as Array from "./Array.js";
+import * as Object from "./Object.js";
 
 export type { Json as t };
 

packages/core/src/Metadata.ts

@@ -1,4 +1,4 @@
-import * as Object from "./Object";
+import * as Object from "./Object.js";
 
 export type { Metadata as t };
 

packages/core/src/Object.ts

@@ -1,5 +1,5 @@
-import * as Array from "./Array";
-import * as Function from "./Function";
+import * as Array from "./Array.js";
+import * as Function from "./Function.js";
 
 /**
  * An alias for an empty object.

packages/core/src/Observable/BehaviorSubject.test.ts

@@ -1,7 +1,7 @@
 import { expect, test } from "bun:test";
 import { spy } from "tinyspy";
 
-import { BehaviorSubject } from "./BehaviorSubject";
+import { BehaviorSubject } from "./BehaviorSubject.js";
 
 test("a behavior subject replays its value on subscribe", () => {
   const observable = new BehaviorSubject(3);

packages/core/src/Observable/BehaviorSubject.ts

@@ -3,8 +3,8 @@ import {
   type Subscription,
   ObservableState,
   toObserver
-} from "./Observable";
-import { Subject } from "./Subject";
+} from "./Observable.js";
+import { Subject } from "./Subject.js";
 
 /**
  * A `BehaviorSubject` is a `Subject` that replays the most recent value when

packages/core/src/Observable/Observable.test.ts

@@ -2,7 +2,7 @@ import { install as useFakeTimers } from "@sinonjs/fake-timers";
 import { expect, test } from "bun:test";
 import { spy } from "tinyspy";
 
-import { Observable } from "./Observable";
+import { Observable } from './Observable.js';
 
 test("subscribing to an observable", () => {
   const observable = Observable.of(5);

packages/core/src/Observable/Observable.ts

@@ -1,4 +1,4 @@
-import { isPromise } from "../Promise";
+import { isPromise } from "../Promise.js";
 
 export type UnaryFunction<A, B> = (a: A) => B;
 

packages/core/src/Observable/Subject.test.ts

@@ -2,7 +2,7 @@ import { install as useFakeTimers } from "@sinonjs/fake-timers";
 import { expect, test } from "bun:test";
 import { spy } from "tinyspy";
 
-import { Subject } from "./Subject";
+import { Subject } from './Subject.js';
 
 test("subscribing to a subject", () => {
   const subject = new Subject();

packages/core/src/Observable/Subject.ts

@@ -5,7 +5,7 @@ import {
   Observable,
   ObservableState,
   toObserver
-} from "./Observable";
+} from "./Observable.js";
 
 /**
  * A `Subject` is both an observable and an observer. A subject can be used to

packages/core/src/Observable/bufferUntil.ts

@@ -1,4 +1,4 @@
-import { type ObservableLike, Observable } from "./Observable";
+import { type ObservableLike, Observable } from "./Observable.js";
 
 export class BufferOverflowError extends Error {
   readonly name = "BufferOverflowError";

packages/core/src/Observable/catchError.ts

@@ -2,7 +2,7 @@ import {
   type ObservableLike,
   type Subscription,
   Observable
-} from "./Observable";
+} from "./Observable.js";
 
 /**
  * Catches an error emitted by an upstream observable. The callback function can

packages/core/src/Observable/cron.ts

@@ -1,5 +1,5 @@
-import { schedule } from "../Time";
-import { Observable } from "./Observable";
+import { schedule } from "../Time.js";
+import { Observable } from "./Observable.js";
 
 /**
  * Creates an observable that calls a function at a regular interval and emits