First stab at a Node.js CLI wrapping the Mocha Remote client

package.json

@@ -23,6 +23,7 @@
   "bugs": "https://github.com/kraenhansen/mocha-remote/issues",
   "license": "ISC",
   "devDependencies": {
+    "@tsconfig/node16": "^16.1.3",
     "@types/chai": "^4",
     "@types/debug": "^4.1.12",
     "@types/mocha": "^10.0.10",

packages/client/src/Client.ts

@@ -102,6 +102,16 @@ export enum ClientState {
 
 const noop = () => { /* tumbleweed */};
 
+function errorFromEvent(event: Event, fallbackMessage: string): Error {
+  if ("error" in event && event.error instanceof Error) {
+    return event.error;
+  } else if ("message" in event && typeof event.message === "string") {
+    return new Error(event.message);
+  } else {
+    return new Error(fallbackMessage);
+  }
+}
+
 export class Client extends ClientEventEmitter {
 
   public static WebSocket: typeof WebSocket;
@@ -187,29 +197,29 @@ export class Client extends ClientEventEmitter {
       this.ws = ws;
       this._state = ClientState.CONNECTING;
 
-      const errorBeforeConnection = (e: Event) => reject(e);
+      const handleConnectionError = (e: Event) => reject(errorFromEvent(e, "Failed to connect"));
 
       ws.addEventListener("close", this.handleClose);
 
       ws.addEventListener("message", this.handleMessage);
 
       ws.addEventListener("error", event => {
-        const { message } = event as ErrorEvent;
-        this.emit(ClientEvents.ERROR, new Error(message));
+        const error = errorFromEvent(event, "Failed to connect");
+        this.emit(ClientEvents.ERROR, error);
       });
 
       ws.addEventListener("open", () => {
         this.debug(`Connected to ${ws.url}`);
         this._state = ClientState.CONNECTED;
-        // No need to track errors before connection
-        ws.removeEventListener("error", errorBeforeConnection);
+        // No need to handle connection error now that we're connected
+        ws.removeEventListener("error", handleConnectionError);
         this.emit("connection", ws);
         resolve();
       });
 
       if (!this.config.autoReconnect) {
-        // Attaching this since the only failed state from connecting is
-        ws.addEventListener("error", errorBeforeConnection);
+        // Attaching this since the only failed state from connecting is when we're not reconnecting
+        ws.addEventListener("error", handleConnectionError);
       }
     })
   }

packages/client/src/serialization.ts

@@ -24,6 +24,13 @@ function toJSON(value: Record<string, unknown>): Record<string, unknown> {
       Object.assign(result, {
         "type": "suite",
         "$$total": value.total(),
+        // TODO: Implement a DeserializedSuite on the client side to properly reconstruct it
+        "suites": [],
+        "tests": [],
+        "_beforeAll": [],
+        "_beforeEach": [],
+        "_afterAll": [],
+        "_afterEach": [],
       });
     }
     return result;

packages/node/mocha-remote-node.js

@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+import "./dist/cli.js"

packages/node/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "mocha-remote-node",
+  "version": "1.12.3",
+  "type": "module",
+  "description": "Node.js wrapper for the Mocha Remote Client",
+  "bin": "./mocha-remote-node.js",
+  "scripts": {
+    "start": "tsx src/cli.ts",
+    "build": "tsc"
+  },
+  "dependencies": {
+    "glob": "^10.4.5"
+  }
+}

packages/node/src/cli.ts

@@ -0,0 +1,70 @@
+import os from "node:os";
+import { globSync } from "glob";
+import { Client } from "mocha-remote-client";
+
+/* eslint-disable no-console */
+
+// TODO: Add support for existing Mocha runtime options for "file handling"
+
+/*
+ * File Handling
+ *       --extension          File extension(s) to load
+ *                                            [array] [default: ["js","cjs","mjs"]]
+ *       --file               Specify file(s) to be loaded prior to root suite
+ *                            execution                   [array] [default: (none)]
+ *       --ignore, --exclude  Ignore file(s) or glob pattern(s)
+ *                                                        [array] [default: (none)]
+ *       --recursive          Look for tests in subdirectories            [boolean]
+ *   -r, --require            Require module              [array] [default: (none)]
+ *   -S, --sort               Sort test files                             [boolean]
+ *   -w, --watch              Watch files in the current working directory for
+ *                            changes                                     [boolean]
+ *       --watch-files        List of paths or globs to watch               [array]
+ *       --watch-ignore       List of paths or globs to exclude from watching
+ *                                       [array] [default: ["node_modules",".git"]]
+ */
+
+interface ConnectionRefusedError extends AggregateError {
+  errors: { code: "ECONNREFUSED", address: string, port: number }[];
+}
+
+function isConnectionRefusedError(error: unknown): error is ConnectionRefusedError {
+  return error instanceof AggregateError && error.errors.every((error: unknown) => {
+    return error instanceof Error &&
+      "code" in error && error.code === "ECONNREFUSED" &&
+      "port" in error && typeof error.port === "number";
+  });
+}
+
+const client = new Client({
+  title: `Node.js v${process.versions.node} on ${os.platform()}`,
+  autoConnect: false,
+  autoReconnect: false,
+  async tests(context) {
+    Object.assign(global, {
+      environment: { ...context, node: true },
+    });
+    // TODO: Is there a more reliable way to get the interpreter and command skipped?
+    const [, , patterns] = process.argv;
+    const testPaths = globSync(patterns, { absolute: true });
+    for (const testPath of testPaths) {
+      await import(testPath);
+    }
+  },
+});
+
+try {
+  await client.connect();
+} catch (error) {
+  process.exitCode = 1;
+  if (isConnectionRefusedError(error)) {
+    const attempts = error.errors.map(error => `${error.address}:${error.port}`);
+    const command = "npx mocha-remote -- mocha-remote-node src/*.test.ts";
+    const suggestion = "Are you wrapping the mocha-remote-node CLI with the mocha-remote?";
+    console.error(`Connection refused (tried ${attempts.join(" / ")}).\n${suggestion}\n${command}`);
+  } else if (error instanceof Error) {
+    console.error("Mocha Remote Client failed:", error.stack);
+  } else {
+    console.error("Mocha Remote Client failed:", error);
+  }
+ }

packages/node/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": ["@tsconfig/node16"],
+  "compilerOptions": {
+    "outDir": "dist",
+    "target": "es2022",
+    "lib": ["es2022"]
+  },
+  "include": ["src"]
+}