Add evaluation helpers (#33)

* Add evaluation helpers

* Make some helpers only available server-side

They don't make any sense on the client side.

* Fork the right thing

packages/ide/src/fill/child_process.ts

@@ -1,7 +1,7 @@
 import * as cp from "child_process";
 import * as net from "net";
 import * as stream from "stream";
-import { CallbackEmitter, ActiveEvalReadable, ActiveEvalWritable, createUniqueEval } from "./evaluation";
+import { CallbackEmitter, ActiveEvalReadable, ActiveEvalWritable } from "@coder/protocol";
 import { client } from "./client";
 import { promisify } from "util";
 
@@ -33,27 +33,19 @@ class ChildProcess extends CallbackEmitter implements cp.ChildProcess {
 
 		this.ae = client.run((ae, command, method, args, options, callbackId) => {
 			const cp = __non_webpack_require__("child_process") as typeof import("child_process");
-			const { maybeCallback, createUniqueEval, bindWritable, bindReadable, preserveEnv } = __non_webpack_require__("@coder/ide/src/fill/evaluation") as typeof import("@coder/ide/src/fill/evaluation");
 
-			preserveEnv(options);
+			ae.preserveEnv(options);
 
 			let childProcess: cp.ChildProcess;
 			switch (method) {
 				case "exec":
-					childProcess = cp.exec(command, options, maybeCallback(ae, callbackId));
+					childProcess = cp.exec(command, options, ae.maybeCallback(callbackId));
 					break;
 				case "spawn":
 					childProcess = cp.spawn(command, args, options);
 					break;
 				case "fork":
-					const forkOptions = options as cp.ForkOptions;
+					childProcess = ae.fork(command, args, options);
-					if (forkOptions && forkOptions.env && forkOptions.env.AMD_ENTRYPOINT) {
-						// TODO: This is vscode-specific and should be abstracted.
-						const { forkModule } = __non_webpack_require__("@coder/server/src/vscode/bootstrapFork") as typeof import ("@coder/server/src/vscode/bootstrapFork");
-						childProcess = forkModule(forkOptions.env.AMD_ENTRYPOINT, args, forkOptions);
-					} else {
-						childProcess = cp.fork(command, args, options);
-					}
 					break;
 				default:
 					throw new Error(`invalid method ${method}`);
@@ -62,7 +54,7 @@ class ChildProcess extends CallbackEmitter implements cp.ChildProcess {
 			ae.on("disconnect", () => childProcess.disconnect());
 			ae.on("kill", (signal: string) => childProcess.kill(signal));
 			ae.on("ref", () => childProcess.ref());
-			ae.on("send", (message: string, callbackId: number) => childProcess.send(message, maybeCallback(ae, callbackId)));
+			ae.on("send", (message: string, callbackId: number) => childProcess.send(message, ae.maybeCallback(callbackId)));
 			ae.on("unref", () => childProcess.unref());
 
 			ae.emit("pid", childProcess.pid);
@@ -73,13 +65,16 @@ class ChildProcess extends CallbackEmitter implements cp.ChildProcess {
 			childProcess.on("message", (message) => ae.emit("message", message));
 
 			if (childProcess.stdin) {
-				bindWritable(createUniqueEval(ae, "stdin"), childProcess.stdin);
+				const stdinAe = ae.createUnique("stdin");
+				stdinAe.bindWritable(childProcess.stdin);
 			}
 			if (childProcess.stdout) {
-				bindReadable(createUniqueEval(ae, "stdout"), childProcess.stdout);
+				const stdoutAe = ae.createUnique("stdout");
+				stdoutAe.bindReadable(childProcess.stdout);
 			}
 			if (childProcess.stderr) {
-				bindReadable(createUniqueEval(ae, "stderr"), childProcess.stderr);
+				const stderrAe = ae.createUnique("stderr");
+				stderrAe.bindReadable(childProcess.stderr);
 			}
 
 			return {
@@ -96,9 +91,9 @@ class ChildProcess extends CallbackEmitter implements cp.ChildProcess {
 			this._connected = true;
 		});
 
-		this.stdin = new ActiveEvalWritable(createUniqueEval(this.ae, "stdin"));
+		this.stdin = new ActiveEvalWritable(this.ae.createUnique("stdin"));
-		this.stdout = new ActiveEvalReadable(createUniqueEval(this.ae, "stdout"));
+		this.stdout = new ActiveEvalReadable(this.ae.createUnique("stdout"));
-		this.stderr = new ActiveEvalReadable(createUniqueEval(this.ae, "stderr"));
+		this.stderr = new ActiveEvalReadable(this.ae.createUnique("stderr"));
 
 		this.ae.on("close", (code, signal) => this.emit("close", code, signal));
 		this.ae.on("disconnect", () => this.emit("disconnect"));

packages/ide/src/fill/electron.ts

@@ -152,7 +152,7 @@ class Clipboard {
 
 class Shell {
 	public async moveItemToTrash(path: string): Promise<void> {
-		await client.evaluate((path) => {
+		await client.evaluate((_helper, path) => {
 			const trash = __non_webpack_require__("trash") as typeof import("trash");
 
 			return trash(path);

packages/ide/src/fill/fs.ts

@@ -26,7 +26,7 @@ class FS {
 			callback = mode;
 			mode = undefined;
 		}
-		this.client.evaluate((path, mode) => {
+		this.client.evaluate((_helper, path, mode) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -44,7 +44,7 @@ class FS {
 			callback = options;
 			options = undefined;
 		}
-		this.client.evaluate((path, data, options) => {
+		this.client.evaluate((_helper, path, data, options) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -57,7 +57,7 @@ class FS {
 	}
 
 	public chmod = (path: fs.PathLike, mode: string | number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((path, mode) => {
+		this.client.evaluate((_helper, path, mode) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -70,7 +70,7 @@ class FS {
 	}
 
 	public chown = (path: fs.PathLike, uid: number, gid: number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((path, uid, gid) => {
+		this.client.evaluate((_helper, path, uid, gid) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -83,7 +83,7 @@ class FS {
 	}
 
 	public close = (fd: number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((fd) => {
+		this.client.evaluate((_helper, fd) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -99,7 +99,7 @@ class FS {
 		if (typeof flags === "function") {
 			callback = flags;
 		}
-		this.client.evaluate((src, dest, flags) => {
+		this.client.evaluate((_helper, src, dest, flags) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -166,7 +166,7 @@ class FS {
 	}
 
 	public exists = (path: fs.PathLike, callback: (exists: boolean) => void): void => {
-		this.client.evaluate((path) => {
+		this.client.evaluate((_helper, path) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -179,7 +179,7 @@ class FS {
 	}
 
 	public fchmod = (fd: number, mode: string | number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((fd, mode) => {
+		this.client.evaluate((_helper, fd, mode) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -192,7 +192,7 @@ class FS {
 	}
 
 	public fchown = (fd: number, uid: number, gid: number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((fd, uid, gid) => {
+		this.client.evaluate((_helper, fd, uid, gid) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -205,7 +205,7 @@ class FS {
 	}
 
 	public fdatasync = (fd: number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((fd) => {
+		this.client.evaluate((_helper, fd) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -218,7 +218,7 @@ class FS {
 	}
 
 	public fstat = (fd: number, callback: (err: NodeJS.ErrnoException, stats: fs.Stats) => void): void => {
-		this.client.evaluate((fd) => {
+		this.client.evaluate((_helper, fd) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 			const tslib = __non_webpack_require__("tslib") as typeof import("tslib");
@@ -242,7 +242,7 @@ class FS {
 	}
 
 	public fsync = (fd: number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((fd) => {
+		this.client.evaluate((_helper, fd) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -259,7 +259,7 @@ class FS {
 			callback = len;
 			len = undefined;
 		}
-		this.client.evaluate((fd, len) => {
+		this.client.evaluate((_helper, fd, len) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -272,7 +272,7 @@ class FS {
 	}
 
 	public futimes = (fd: number, atime: string | number | Date, mtime: string | number | Date, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((fd, atime, mtime) => {
+		this.client.evaluate((_helper, fd, atime, mtime) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -285,7 +285,7 @@ class FS {
 	}
 
 	public lchmod = (path: fs.PathLike, mode: string | number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((path, mode) => {
+		this.client.evaluate((_helper, path, mode) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -298,7 +298,7 @@ class FS {
 	}
 
 	public lchown = (path: fs.PathLike, uid: number, gid: number, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((path, uid, gid) => {
+		this.client.evaluate((_helper, path, uid, gid) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -311,7 +311,7 @@ class FS {
 	}
 
 	public link = (existingPath: fs.PathLike, newPath: fs.PathLike, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((existingPath, newPath) => {
+		this.client.evaluate((_helper, existingPath, newPath) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -324,7 +324,7 @@ class FS {
 	}
 
 	public lstat = (path: fs.PathLike, callback: (err: NodeJS.ErrnoException, stats: fs.Stats) => void): void => {
-		this.client.evaluate((path) => {
+		this.client.evaluate((_helper, path) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 			const tslib = __non_webpack_require__("tslib") as typeof import("tslib");
@@ -352,7 +352,7 @@ class FS {
 			callback = mode;
 			mode = undefined;
 		}
-		this.client.evaluate((path, mode) => {
+		this.client.evaluate((_helper, path, mode) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -369,7 +369,7 @@ class FS {
 			callback = options;
 			options = undefined;
 		}
-		this.client.evaluate((prefix, options) => {
+		this.client.evaluate((_helper, prefix, options) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -386,7 +386,7 @@ class FS {
 			callback = mode;
 			mode = undefined;
 		}
-		this.client.evaluate((path, flags, mode) => {
+		this.client.evaluate((_helper, path, flags, mode) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -399,7 +399,7 @@ class FS {
 	}
 
 	public read = <TBuffer extends Buffer | Uint8Array>(fd: number, buffer: TBuffer, offset: number, length: number, position: number | null, callback: (err: NodeJS.ErrnoException, bytesRead: number, buffer: TBuffer) => void): void => {
-		this.client.evaluate((fd, length, position) => {
+		this.client.evaluate((_helper, fd, length, position) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 			const buffer = new _Buffer(length);
@@ -424,7 +424,7 @@ class FS {
 			callback = options;
 			options = undefined;
 		}
-		this.client.evaluate((path, options) => {
+		this.client.evaluate((_helper, path, options) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -442,7 +442,7 @@ class FS {
 			options = undefined;
 		}
 		// TODO: options can also take `withFileTypes` but the types aren't working.
-		this.client.evaluate((path, options) => {
+		this.client.evaluate((_helper, path, options) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -459,7 +459,7 @@ class FS {
 			callback = options;
 			options = undefined;
 		}
-		this.client.evaluate((path, options) => {
+		this.client.evaluate((_helper, path, options) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -476,7 +476,7 @@ class FS {
 			callback = options;
 			options = undefined;
 		}
-		this.client.evaluate((path, options) => {
+		this.client.evaluate((_helper, path, options) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -489,7 +489,7 @@ class FS {
 	}
 
 	public rename = (oldPath: fs.PathLike, newPath: fs.PathLike, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((oldPath, newPath) => {
+		this.client.evaluate((_helper, oldPath, newPath) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -502,7 +502,7 @@ class FS {
 	}
 
 	public rmdir = (path: fs.PathLike, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((path) => {
+		this.client.evaluate((_helper, path) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -515,7 +515,7 @@ class FS {
 	}
 
 	public stat = (path: fs.PathLike, callback: (err: NodeJS.ErrnoException, stats: fs.Stats) => void): void => {
-		this.client.evaluate((path) => {
+		this.client.evaluate((_helper, path) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 			const tslib = __non_webpack_require__("tslib") as typeof import("tslib");
@@ -547,7 +547,7 @@ class FS {
 			callback = type;
 			type = undefined;
 		}
-		this.client.evaluate((target, path, type) => {
+		this.client.evaluate((_helper, target, path, type) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -564,7 +564,7 @@ class FS {
 			callback = len;
 			len = undefined;
 		}
-		this.client.evaluate((path, len) => {
+		this.client.evaluate((_helper, path, len) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -577,7 +577,7 @@ class FS {
 	}
 
 	public unlink = (path: fs.PathLike, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((path) => {
+		this.client.evaluate((_helper, path) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -590,7 +590,7 @@ class FS {
 	}
 
 	public utimes = (path: fs.PathLike, atime: string | number | Date, mtime: string | number | Date, callback: (err: NodeJS.ErrnoException) => void): void => {
-		this.client.evaluate((path, atime, mtime) => {
+		this.client.evaluate((_helper, path, atime, mtime) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -615,7 +615,7 @@ class FS {
 			callback = position;
 			position = undefined;
 		}
-		this.client.evaluate((fd, buffer, offset, length, position) => {
+		this.client.evaluate((_helper, fd, buffer, offset, length, position) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 
@@ -638,7 +638,7 @@ class FS {
 			callback = options;
 			options = undefined;
 		}
-		this.client.evaluate((path, data, options) => {
+		this.client.evaluate((_helper, path, data, options) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 

packages/ide/src/fill/net.ts

@@ -1,6 +1,5 @@
 import * as net from "net";
-import { ActiveEval } from "@coder/protocol";
+import { CallbackEmitter, ActiveEvalDuplex, ActiveEvalHelper } from "@coder/protocol";
-import { CallbackEmitter, ActiveEvalDuplex, createUniqueEval } from "./evaluation";
 import { client } from "./client";
 
 declare var __non_webpack_require__: typeof require;
@@ -9,12 +8,11 @@ class Socket extends ActiveEvalDuplex implements net.Socket {
 	private _connecting: boolean = false;
 	private _destroyed: boolean = false;
 
-	public constructor(options?: net.SocketConstructorOpts, ae?: ActiveEval) {
+	public constructor(options?: net.SocketConstructorOpts, ae?: ActiveEvalHelper) {
 		super(ae || client.run((ae, options) => {
 			const net = __non_webpack_require__("net") as typeof import("net");
-			const { bindSocket } = __non_webpack_require__("@coder/ide/src/fill/evaluation") as typeof import("@coder/ide/src/fill/evaluation");
 
-			return bindSocket(ae, new net.Socket(options));
+			return ae.bindSocket(new net.Socket(options));
 		}, options));
 
 		this.ae.on("connect", () => {
@@ -94,14 +92,14 @@ class Server extends CallbackEmitter implements net.Server {
 
 		this.ae = client.run((ae, options, callbackId) => {
 			const net = __non_webpack_require__("net") as typeof import("net");
-			const { maybeCallback, bindSocket, createUniqueEval } = __non_webpack_require__("@coder/ide/src/fill/evaluation") as typeof import("@coder/ide/src/fill/evaluation");
 
 			let connectionId = 0;
 			const sockets = new Map<number, net.Socket>();
 			const storeSocket = (socket: net.Socket): number => {
 				const socketId = connectionId++;
 				sockets.set(socketId, socket);
-				const disposer = bindSocket(createUniqueEval(ae, socketId), socket);
+				const socketAe = ae.createUnique(socketId);
+				const disposer = socketAe.bindSocket(socket);
 				socket.on("close", () => {
 					disposer.dispose();
 					sockets.delete(socketId);
@@ -110,7 +108,7 @@ class Server extends CallbackEmitter implements net.Server {
 				return socketId;
 			};
 
-			const callback = maybeCallback(ae, callbackId);
+			const callback = ae.maybeCallback(callbackId);
 			let server = new net.Server(options, typeof callback !== "undefined" ? (socket): void => {
 				callback(storeSocket(socket));
 			} : undefined);
@@ -120,7 +118,7 @@ class Server extends CallbackEmitter implements net.Server {
 			server.on("error", (error) => ae.emit("error", error));
 			server.on("listening", () => ae.emit("listening"));
 
-			ae.on("close", (callbackId: number) => server.close(maybeCallback(ae, callbackId)));
+			ae.on("close", (callbackId: number) => server.close(ae.maybeCallback(callbackId)));
 			ae.on("listen", (handle?: net.ListenOptions | number | string) => server.listen(handle));
 			ae.on("ref", () => server.ref());
 			ae.on("unref", () => server.unref());
@@ -147,7 +145,8 @@ class Server extends CallbackEmitter implements net.Server {
 		});
 
 		this.ae.on("connection", (socketId) => {
-			const socket = new Socket(undefined, createUniqueEval(this.ae, socketId));
+			const socketAe = this.ae.createUnique(socketId);
+			const socket = new Socket(undefined, socketAe);
 			this.sockets.set(socketId, socket);
 			socket.on("close", () => this.sockets.delete(socketId));
 			if (connectionListener) {

packages/protocol/src/browser/client.ts

@@ -1,10 +1,10 @@
 import { EventEmitter } from "events";
 import { Emitter } from "@coder/events";
 import { logger, field } from "@coder/logger";
-import { ReadWriteConnection, InitData, OperatingSystem, SharedProcessData } from "../common/connection";
-import { Disposer, stringify, parse } from "../common/util";
 import { NewEvalMessage, ServerMessage, EvalDoneMessage, EvalFailedMessage, ClientMessage, WorkingInitMessage, EvalEventMessage } from "../proto";
-import { ActiveEval } from "./evaluate";
+import { ReadWriteConnection, InitData, OperatingSystem, SharedProcessData } from "../common/connection";
+import { ActiveEvalHelper, EvalHelper, Disposer, ServerActiveEvalHelper } from "../common/helpers";
+import { stringify, parse } from "../common/util";
 
 /**
  * Client accepts an arbitrary connection intended to communicate with the Server.
@@ -56,13 +56,13 @@ export class Client {
 		return this.initDataPromise;
 	}
 
-	public run(func: (ae: ActiveEval) => Disposer): ActiveEval;
+	public run(func: (helper: ServerActiveEvalHelper) => Disposer): ActiveEvalHelper;
-	public run<T1>(func: (ae: ActiveEval, a1: T1) => Disposer, a1: T1): ActiveEval;
+	public run<T1>(func: (helper: ServerActiveEvalHelper, a1: T1) => Disposer, a1: T1): ActiveEvalHelper;
-	public run<T1, T2>(func: (ae: ActiveEval, a1: T1, a2: T2) => Disposer, a1: T1, a2: T2): ActiveEval;
+	public run<T1, T2>(func: (helper: ServerActiveEvalHelper, a1: T1, a2: T2) => Disposer, a1: T1, a2: T2): ActiveEvalHelper;
-	public run<T1, T2, T3>(func: (ae: ActiveEval, a1: T1, a2: T2, a3: T3) => Disposer, a1: T1, a2: T2, a3: T3): ActiveEval;
+	public run<T1, T2, T3>(func: (helper: ServerActiveEvalHelper, a1: T1, a2: T2, a3: T3) => Disposer, a1: T1, a2: T2, a3: T3): ActiveEvalHelper;
-	public run<T1, T2, T3, T4>(func: (ae: ActiveEval, a1: T1, a2: T2, a3: T3, a4: T4) => Disposer, a1: T1, a2: T2, a3: T3, a4: T4): ActiveEval;
+	public run<T1, T2, T3, T4>(func: (helper: ServerActiveEvalHelper, a1: T1, a2: T2, a3: T3, a4: T4) => Disposer, a1: T1, a2: T2, a3: T3, a4: T4): ActiveEvalHelper;
-	public run<T1, T2, T3, T4, T5>(func: (ae: ActiveEval, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5) => Disposer, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5): ActiveEval;
+	public run<T1, T2, T3, T4, T5>(func: (helper: ServerActiveEvalHelper, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5) => Disposer, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5): ActiveEvalHelper;
-	public run<T1, T2, T3, T4, T5, T6>(func: (ae: ActiveEval, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5, a6: T6) => Disposer, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5, a6: T6): ActiveEval;
+	public run<T1, T2, T3, T4, T5, T6>(func: (helper: ServerActiveEvalHelper, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5, a6: T6) => Disposer, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5, a6: T6): ActiveEvalHelper;
 	/**
 	 * Run a function on the server and provide an event emitter which allows
 	 * listening and emitting to the emitter provided to that function. The
@@ -70,7 +70,7 @@ export class Client {
 	 * disconnects and for notifying when disposal has happened outside manual
 	 * activation.
 	 */
-	public run<T1, T2, T3, T4, T5, T6>(func: (ae: ActiveEval, a1?: T1, a2?: T2, a3?: T3, a4?: T4, a5?: T5, a6?: T6) => Disposer, a1?: T1, a2?: T2, a3?: T3, a4?: T4, a5?: T5, a6?: T6): ActiveEval {
+	public run<T1, T2, T3, T4, T5, T6>(func: (helper: ServerActiveEvalHelper, a1?: T1, a2?: T2, a3?: T3, a4?: T4, a5?: T5, a6?: T6) => Disposer, a1?: T1, a2?: T2, a3?: T3, a4?: T4, a5?: T5, a6?: T6): ActiveEvalHelper {
 		const doEval = this.doEvaluate(func, a1, a2, a3, a4, a5, a6, true);
 
 		// This takes server events and emits them to the client's emitter.
@@ -89,9 +89,9 @@ export class Client {
 			eventEmitter.emit("error", ex);
 		});
 
+		return new ActiveEvalHelper({
 			// This takes client events and emits them to the server's emitter and
 			// listens to events received from the server (via the event hook above).
-		return {
 			// tslint:disable no-any
 			on: (event: string, cb: (...args: any[]) => void): EventEmitter => eventEmitter.on(event, cb),
 			emit: (event: string, ...args: any[]): void => {
@@ -105,21 +105,21 @@ export class Client {
 			},
 			removeAllListeners: (event: string): EventEmitter => eventEmitter.removeAllListeners(event),
 			// tslint:enable no-any
-		};
+		});
 	}
 
-	public evaluate<R>(func: () => R | Promise<R>): Promise<R>;
+	public evaluate<R>(func: (helper: EvalHelper) => R | Promise<R>): Promise<R>;
-	public evaluate<R, T1>(func: (a1: T1) => R | Promise<R>, a1: T1): Promise<R>;
+	public evaluate<R, T1>(func: (helper: EvalHelper, a1: T1) => R | Promise<R>, a1: T1): Promise<R>;
-	public evaluate<R, T1, T2>(func: (a1: T1, a2: T2) => R | Promise<R>, a1: T1, a2: T2): Promise<R>;
+	public evaluate<R, T1, T2>(func: (helper: EvalHelper, a1: T1, a2: T2) => R | Promise<R>, a1: T1, a2: T2): Promise<R>;
-	public evaluate<R, T1, T2, T3>(func: (a1: T1, a2: T2, a3: T3) => R | Promise<R>, a1: T1, a2: T2, a3: T3): Promise<R>;
+	public evaluate<R, T1, T2, T3>(func: (helper: EvalHelper, a1: T1, a2: T2, a3: T3) => R | Promise<R>, a1: T1, a2: T2, a3: T3): Promise<R>;
-	public evaluate<R, T1, T2, T3, T4>(func: (a1: T1, a2: T2, a3: T3, a4: T4) => R | Promise<R>, a1: T1, a2: T2, a3: T3, a4: T4): Promise<R>;
+	public evaluate<R, T1, T2, T3, T4>(func: (helper: EvalHelper, a1: T1, a2: T2, a3: T3, a4: T4) => R | Promise<R>, a1: T1, a2: T2, a3: T3, a4: T4): Promise<R>;
-	public evaluate<R, T1, T2, T3, T4, T5>(func: (a1: T1, a2: T2, a3: T3, a4: T4, a5: T5) => R | Promise<R>, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5): Promise<R>;
+	public evaluate<R, T1, T2, T3, T4, T5>(func: (helper: EvalHelper, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5) => R | Promise<R>, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5): Promise<R>;
-	public evaluate<R, T1, T2, T3, T4, T5, T6>(func: (a1: T1, a2: T2, a3: T3, a4: T4, a5: T5, a6: T6) => R | Promise<R>, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5, a6: T6): Promise<R>;
+	public evaluate<R, T1, T2, T3, T4, T5, T6>(func: (helper: EvalHelper, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5, a6: T6) => R | Promise<R>, a1: T1, a2: T2, a3: T3, a4: T4, a5: T5, a6: T6): Promise<R>;
 	/**
 	 * Evaluates a function on the server.
 	 * To pass variables, ensure they are serializable and passed through the included function.
 	 * @example
-	 * const returned = await this.client.evaluate((value) => {
+	 * const returned = await this.client.evaluate((helper, value) => {
 	 *     return value;
 	 * }, "hi");
 	 * console.log(returned);
@@ -127,7 +127,7 @@ export class Client {
 	 * @param func Function to evaluate
 	 * @returns Promise rejected or resolved from the evaluated function
 	 */
-	public evaluate<R, T1, T2, T3, T4, T5, T6>(func: (a1?: T1, a2?: T2, a3?: T3, a4?: T4, a5?: T5, a6?: T6) => R | Promise<R>, a1?: T1, a2?: T2, a3?: T3, a4?: T4, a5?: T5, a6?: T6): Promise<R> {
+	public evaluate<R, T1, T2, T3, T4, T5, T6>(func: (helper: EvalHelper, a1?: T1, a2?: T2, a3?: T3, a4?: T4, a5?: T5, a6?: T6) => R | Promise<R>, a1?: T1, a2?: T2, a3?: T3, a4?: T4, a5?: T5, a6?: T6): Promise<R> {
 		return this.doEvaluate(func, a1, a2, a3, a4, a5, a6, false).completed;
 	}
 

packages/protocol/src/browser/evaluate.ts

@@ -1,8 +0,0 @@
-export interface ActiveEval {
-	removeAllListeners(event?: string): void;
-
-	// tslint:disable no-any
-	emit(event: string, ...args: any[]): void;
-	on(event: string, cb: (...args: any[]) => void): void;
-	// tslint:disable no-any
-}

packages/protocol/src/common/helpers.ts

@@ -1,50 +1,138 @@
-import { SpawnOptions, ForkOptions } from "child_process";
+import { ChildProcess, SpawnOptions, ForkOptions } from "child_process";
 import { EventEmitter } from "events";
 import { Socket } from "net";
 import { Duplex, Readable, Writable } from "stream";
+import { IDisposable } from "@coder/disposable";
 import { logger } from "@coder/logger";
-import { ActiveEval, Disposer } from "@coder/protocol";
 
 // tslint:disable no-any
-/**
- * If there is a callback ID, return a function that emits the callback event on
- * the active evaluation with that ID and all arguments passed to it. Otherwise,
- * return undefined.
- */
-export const maybeCallback = (ae: ActiveEval, callbackId?: number): ((...args: any[])  => void) | undefined => {
-	return typeof callbackId !== "undefined" ? (...args: any[]): void => {
-		ae.emit("callback", callbackId, ...args);
-	} : undefined;
-};
 
-// Some spawn code tries to preserve the env (the debug adapter for
+export type ForkProvider = (modulePath: string, args: string[], options: ForkOptions, dataDir?: string) => ChildProcess;
-// instance) but the env is mostly blank (since we're in the browser), so
+
-// we'll just always preserve the main process.env here, otherwise it
+export interface Disposer extends IDisposable {
-// won't have access to PATH, etc.
+	onDidDispose: (cb: () => void) => void;
-// TODO: An alternative solution would be to send the env to the browser?
+}
-export const preserveEnv = (options: SpawnOptions | ForkOptions): void => {
+
+interface ActiveEvalEmitter {
+	removeAllListeners(event?: string): void;
+	emit(event: string, ...args: any[]): void;
+	on(event: string, cb: (...args: any[]) => void): void;
+}
+
+/**
+ * Helper class for evaluations.
+ */
+export class EvalHelper {
+	/**
+	 * Some spawn code tries to preserve the env (the debug adapter for instance)
+	 * but the env is mostly blank (since we're in the browser), so we'll just
+	 * always preserve the main process.env here, otherwise it won't have access
+	 * to PATH, etc.
+	 * TODO: An alternative solution would be to send the env to the browser?
+	*/
+	public preserveEnv(options: SpawnOptions | ForkOptions): void {
 		if (options && options.env) {
 			options.env = { ...process.env, ...options.env };
 		}
-};
+	}
+}
 
 /**
- * Bind a socket to an active evaluation.
+ * Helper class for active evaluations.
  */
-export const bindSocket = (ae: ActiveEval, socket: Socket): Disposer => {
+export class ActiveEvalHelper extends EvalHelper implements ActiveEvalEmitter {
-	socket.on("connect", () => ae.emit("connect"));
+	public constructor(private readonly emitter: ActiveEvalEmitter) {
-	socket.on("lookup", (error, address, family, host) => ae.emit("lookup", error, address, family, host));
+		super();
-	socket.on("timeout", () => ae.emit("timeout"));
+	}
 
-	ae.on("connect", (options, callbackId) => socket.connect(options, maybeCallback(ae, callbackId)));
+	public removeAllListeners(event?: string): void {
-	ae.on("ref", () => socket.ref());
+		this.emitter.removeAllListeners(event);
-	ae.on("setKeepAlive", (enable, initialDelay) => socket.setKeepAlive(enable, initialDelay));
+	}
-	ae.on("setNoDelay", (noDelay) => socket.setNoDelay(noDelay));
-	ae.on("setTimeout", (timeout, callbackId) => socket.setTimeout(timeout, maybeCallback(ae, callbackId)));
-	ae.on("unref", () => socket.unref());
 
-	bindReadable(ae, socket);
+	public emit(event: string, ...args: any[]): void {
-	bindWritable(ae, socket);
+		this.emitter.emit(event, ...args);
+	}
+
+	public on(event: string, cb: (...args: any[]) => void): void {
+		this.emitter.on(event, cb);
+	}
+
+	/**
+	 * Create a new helper to make unique events for an item.
+	 */
+	public createUnique(id: number | "stdout" | "stderr" | "stdin"): ActiveEvalHelper {
+		return new ActiveEvalHelper(this.createUniqueEmitter(id));
+	}
+
+	/**
+	 * Wrap the evaluation emitter to make unique events for an item to prevent
+	 * conflicts when it shares that emitter with other items.
+	 */
+	protected createUniqueEmitter(id: number | "stdout" | "stderr" | "stdin"): ActiveEvalEmitter {
+		let events = <string[]>[];
+
+		return {
+			removeAllListeners: (event?: string): void => {
+				if (!event) {
+					events.forEach((e) => this.removeAllListeners(e));
+					events = [];
+				} else {
+					const index = events.indexOf(event);
+					if (index !== -1) {
+						events.splice(index, 1);
+						this.removeAllListeners(`${event}:${id}`);
+					}
+				}
+			},
+			emit: (event: string, ...args: any[]): void => {
+				this.emit(`${event}:${id}`, ...args);
+			},
+			on: (event: string, cb: (...args: any[]) => void): void => {
+				if (!events.includes(event)) {
+					events.push(event);
+				}
+				this.on(`${event}:${id}`, cb);
+			},
+		};
+	}
+}
+
+/**
+ * Helper class for server-side active evaluations.
+ */
+export class ServerActiveEvalHelper extends ActiveEvalHelper {
+	public constructor(emitter: ActiveEvalEmitter, public readonly fork: ForkProvider) {
+		super(emitter);
+	}
+
+	/**
+	 * If there is a callback ID, return a function that emits the callback event
+	 * on the active evaluation with that ID and all arguments passed to it.
+	 * Otherwise, return undefined.
+	 */
+	public maybeCallback(callbackId?: number): ((...args: any[])  => void) | undefined {
+		return typeof callbackId !== "undefined" ? (...args: any[]): void => {
+			this.emit("callback", callbackId, ...args);
+		} : undefined;
+	}
+
+	/**
+	 * Bind a socket to an active evaluation and returns a disposer.
+	 */
+	public bindSocket(socket: Socket): Disposer {
+		socket.on("connect", () => this.emit("connect"));
+		socket.on("lookup", (error, address, family, host) => this.emit("lookup", error, address, family, host));
+		socket.on("timeout", () => this.emit("timeout"));
+
+		this.on("connect", (options, callbackId) => socket.connect(options, this.maybeCallback(callbackId)));
+		this.on("ref", () => socket.ref());
+		this.on("setKeepAlive", (enable, initialDelay) => socket.setKeepAlive(enable, initialDelay));
+		this.on("setNoDelay", (noDelay) => socket.setNoDelay(noDelay));
+		this.on("setTimeout", (timeout, callbackId) => socket.setTimeout(timeout, this.maybeCallback(callbackId)));
+		this.on("unref", () => socket.unref());
+
+		this.bindReadable(socket);
+		this.bindWritable(socket);
 
 		return {
 			onDidDispose: (cb): Socket => socket.on("close", cb),
@@ -55,100 +143,73 @@ export const bindSocket = (ae: ActiveEval, socket: Socket): Disposer => {
 				socket.unref();
 			},
 		};
-};
+	}
 
 	/**
- * Bind a writable stream to an active evaluation.
+	 * Bind a writable stream to the active evaluation.
 	 */
-export const bindWritable = (ae: ActiveEval, writable: Writable | Duplex): void => {
+	public bindWritable(writable: Writable | Duplex): void {
 		if (!((writable as Readable).read)) { // To avoid binding twice.
-		writable.on("close", () => ae.emit("close"));
+			writable.on("close", () => this.emit("close"));
-		writable.on("error", (error) => ae.emit("error", error));
+			writable.on("error", (error) => this.emit("error", error));
 
-		ae.on("destroy", () => writable.destroy());
+			this.on("destroy", () => writable.destroy());
 		}
 
-	writable.on("drain", () => ae.emit("drain"));
+		writable.on("drain", () => this.emit("drain"));
-	writable.on("finish", () => ae.emit("finish"));
+		writable.on("finish", () => this.emit("finish"));
-	writable.on("pipe", () => ae.emit("pipe"));
+		writable.on("pipe", () => this.emit("pipe"));
-	writable.on("unpipe", () => ae.emit("unpipe"));
+		writable.on("unpipe", () => this.emit("unpipe"));
 
-	ae.on("cork", () => writable.cork());
+		this.on("cork", () => writable.cork());
-	ae.on("end", (chunk, encoding, callbackId) => writable.end(chunk, encoding, maybeCallback(ae, callbackId)));
+		this.on("end", (chunk, encoding, callbackId) => writable.end(chunk, encoding, this.maybeCallback(callbackId)));
-	ae.on("setDefaultEncoding", (encoding) => writable.setDefaultEncoding(encoding));
+		this.on("setDefaultEncoding", (encoding) => writable.setDefaultEncoding(encoding));
-	ae.on("uncork", () => writable.uncork());
+		this.on("uncork", () => writable.uncork());
 		// Sockets can pass an fd instead of a callback but streams cannot.
-	ae.on("write", (chunk, encoding, fd, callbackId) => writable.write(chunk, encoding, maybeCallback(ae, callbackId) || fd));
+		this.on("write", (chunk, encoding, fd, callbackId) => writable.write(chunk, encoding, this.maybeCallback(callbackId) || fd));
-};
+	}
 
 	/**
- * Bind a readable stream to an active evaluation.
+	 * Bind a readable stream to the active evaluation.
 	 */
-export const bindReadable = (ae: ActiveEval, readable: Readable): void => {
+	public bindReadable(readable: Readable): void {
 		// Streams don't have an argument on close but sockets do.
-	readable.on("close", (...args: any[]) => ae.emit("close", ...args));
+		readable.on("close", (...args: any[]) => this.emit("close", ...args));
-	readable.on("data", (data) => ae.emit("data", data));
+		readable.on("data", (data) => this.emit("data", data));
-	readable.on("end", () => ae.emit("end"));
+		readable.on("end", () => this.emit("end"));
-	readable.on("error", (error) => ae.emit("error", error));
+		readable.on("error", (error) => this.emit("error", error));
-	readable.on("readable", () => ae.emit("readable"));
+		readable.on("readable", () => this.emit("readable"));
 
-	ae.on("destroy", () => readable.destroy());
+		this.on("destroy", () => readable.destroy());
-	ae.on("pause", () => readable.pause());
+		this.on("pause", () => readable.pause());
-	ae.on("push", (chunk, encoding) => readable.push(chunk, encoding));
+		this.on("push", (chunk, encoding) => readable.push(chunk, encoding));
-	ae.on("resume", () => readable.resume());
+		this.on("resume", () => readable.resume());
-	ae.on("setEncoding", (encoding) => readable.setEncoding(encoding));
+		this.on("setEncoding", (encoding) => readable.setEncoding(encoding));
-	ae.on("unshift", (chunk) => readable.unshift(chunk));
+		this.on("unshift", (chunk) => readable.unshift(chunk));
-};
+	}
 
-/**
+	public createUnique(id: number | "stdout" | "stderr" | "stdin"): ServerActiveEvalHelper {
- * Wrap an evaluation emitter to make unique events for an item to prevent
+		return new ServerActiveEvalHelper(this.createUniqueEmitter(id), this.fork);
- * conflicts when it shares that emitter with other items.
- */
-export const createUniqueEval = (ae: ActiveEval, id: number | "stdout" | "stderr" | "stdin"): ActiveEval => {
-	let events = <string[]>[];
-
-	return {
-		removeAllListeners: (event?: string): void => {
-			if (!event) {
-				events.forEach((e) => ae.removeAllListeners(e));
-				events = [];
-			} else {
-				const index = events.indexOf(event);
-				if (index !== -1) {
-					events.splice(index, 1);
-					ae.removeAllListeners(`${event}:${id}`);
 	}
 }
-		},
-		emit: (event: string, ...args: any[]): void => {
-			ae.emit(`${event}:${id}`, ...args);
-		},
-		on: (event: string, cb: (...args: any[]) => void): void => {
-			if (!events.includes(event)) {
-				events.push(event);
-			}
-			ae.on(`${event}:${id}`, cb);
-		},
-	};
-};
 
 /**
  * An event emitter that can store callbacks with IDs in a map so we can pass
  * them back and forth through an active evaluation using those IDs.
  */
 export class CallbackEmitter extends EventEmitter {
-	private _ae: ActiveEval | undefined;
+	private _ae: ActiveEvalHelper | undefined;
 	private callbackId = 0;
 	private readonly callbacks = new Map<number, Function>();
 
-	public constructor(ae?: ActiveEval) {
+	public constructor(ae?: ActiveEvalHelper) {
 		super();
 		if (ae) {
 			this.ae = ae;
 		}
 	}
 
-	protected get ae(): ActiveEval {
+	protected get ae(): ActiveEvalHelper {
 		if (!this._ae) {
 			throw new Error("trying to access active evaluation before it has been set");
 		}
@@ -156,7 +217,7 @@ export class CallbackEmitter extends EventEmitter {
 		return this._ae;
 	}
 
-	protected set ae(ae: ActiveEval) {
+	protected set ae(ae: ActiveEvalHelper) {
 		if (this._ae) {
 			throw new Error("cannot override active evaluation");
 		}
@@ -195,7 +256,7 @@ export class CallbackEmitter extends EventEmitter {
  * A writable stream over an active evaluation.
  */
 export class ActiveEvalWritable extends CallbackEmitter implements Writable {
-	public constructor(ae: ActiveEval) {
+	public constructor(ae: ActiveEvalHelper) {
 		super(ae);
 		// Streams don't have an argument on close but sockets do.
 		this.ae.on("close", (...args: any[]) => this.emit("close", ...args));
@@ -249,7 +310,7 @@ export class ActiveEvalWritable extends CallbackEmitter implements Writable {
  * A readable stream over an active evaluation.
  */
 export class ActiveEvalReadable extends CallbackEmitter implements Readable {
-	public constructor(ae: ActiveEval) {
+	public constructor(ae: ActiveEvalHelper) {
 		super(ae);
 		this.ae.on("close", () => this.emit("close"));
 		this.ae.on("data", (data) => this.emit("data", data));
@@ -290,7 +351,7 @@ export class ActiveEvalReadable extends CallbackEmitter implements Readable {
  */
 export class ActiveEvalDuplex extends ActiveEvalReadable implements Duplex {
 	// Some unfortunate duplication here since we can't have multiple extends.
-	public constructor(ae: ActiveEval) {
+	public constructor(ae: ActiveEvalHelper) {
 		super(ae);
 		this.ae.on("drain", () => this.emit("drain"));
 		this.ae.on("finish", () => this.emit("finish"));

packages/protocol/src/common/util.ts

@@ -1,5 +1,3 @@
-import { IDisposable } from "@coder/disposable";
-
 /**
  * Return true if we're in a browser environment (including web workers).
  */
@@ -84,7 +82,3 @@ export const parse = (arg: string): any => { // tslint:disable-line no-any
 
 	return result;
 };
-
-export interface Disposer extends IDisposable {
-	onDidDispose: (cb: () => void) => void;
-}

packages/protocol/src/index.ts

@@ -1,4 +1,4 @@
 export * from "./browser/client";
-export * from "./browser/evaluate";
 export * from "./common/connection";
+export * from "./common/helpers";
 export * from "./common/util";

packages/protocol/src/node/evaluate.ts

@@ -1,8 +1,10 @@
+import { fork as cpFork } from "child_process";
 import { EventEmitter } from "events";
 import * as vm from "vm";
 import { logger, field } from "@coder/logger";
 import { NewEvalMessage, EvalFailedMessage, EvalDoneMessage, ServerMessage, EvalEventMessage } from "../proto";
 import { SendableConnection } from "../common/connection";
+import { ServerActiveEvalHelper, EvalHelper, ForkProvider } from "../common/helpers";
 import { stringify, parse } from "../common/util";
 
 export interface ActiveEvaluation {
@@ -11,7 +13,7 @@ export interface ActiveEvaluation {
 }
 
 declare var __non_webpack_require__: typeof require;
-export const evaluate = (connection: SendableConnection, message: NewEvalMessage, onDispose: () => void): ActiveEvaluation | void => {
+export const evaluate = (connection: SendableConnection, message: NewEvalMessage, onDispose: () => void, fork?: ForkProvider): ActiveEvaluation | void => {
 	/**
 	 * Send the response and call onDispose.
 	 */
@@ -46,7 +48,10 @@ export const evaluate = (connection: SendableConnection, message: NewEvalMessage
 
 	let eventEmitter = message.getActive() ? new EventEmitter(): undefined;
 	const sandbox = {
-		eventEmitter: eventEmitter ? {
+		helper: eventEmitter ? new ServerActiveEvalHelper({
+			removeAllListeners: (event?: string): void => {
+				eventEmitter!.removeAllListeners(event);
+			},
 			// tslint:disable no-any
 			on: (event: string, cb: (...args: any[]) => void): void => {
 				eventEmitter!.on(event, (...args: any[]) => {
@@ -73,7 +78,7 @@ export const evaluate = (connection: SendableConnection, message: NewEvalMessage
 				connection.send(serverMsg.serializeBinary());
 			},
 			// tslint:enable no-any
-		} : undefined,
+		}, fork || cpFork) : new EvalHelper(),
 		_Buffer: Buffer,
 		// When the client is ran from Webpack, it will replace
 		// __non_webpack_require__ with require, which we then need to provide to
@@ -94,7 +99,7 @@ export const evaluate = (connection: SendableConnection, message: NewEvalMessage
 
 	let value: any; // tslint:disable-line no-any
 	try {
-		const code = `(${message.getFunction()})(${eventEmitter ? "eventEmitter, " : ""}...args);`;
+		const code = `(${message.getFunction()})(helper, ...args);`;
 		value = vm.runInNewContext(code, sandbox, {
 			// If the code takes longer than this to return, it is killed and throws.
 			timeout: message.getTimeout() || 15000,

packages/protocol/src/node/server.ts

@@ -5,12 +5,14 @@ import { promisify } from "util";
 import { logger, field } from "@coder/logger";
 import { ClientMessage, WorkingInitMessage, ServerMessage } from "../proto";
 import { evaluate, ActiveEvaluation } from "./evaluate";
+import { ForkProvider } from "../common/helpers";
 import { ReadWriteConnection } from "../common/connection";
 
 export interface ServerOptions {
 	readonly workingDirectory: string;
 	readonly dataDirectory: string;
 	readonly builtInExtensionsDirectory: string;
+	readonly fork?: ForkProvider;
 }
 
 export class Server {
@@ -105,7 +107,7 @@ export class Server {
 				logger.trace(() => [
 					`dispose ${evalMessage.getId()}, ${this.evals.size} left`,
 				]);
-			});
+			}, this.options ? this.options.fork : undefined);
 			if (resp) {
 				this.evals.set(evalMessage.getId(), resp);
 			}

packages/protocol/test/evaluate.test.ts

@@ -13,7 +13,7 @@ describe("Evaluate", () => {
 
 	it("should compute from string", async () => {
 		const start = "ban\%\$\"``a,,,,asdasd";
-		const value = await client.evaluate((a) => {
+		const value = await client.evaluate((_helper, a) => {
 			return a;
 		}, start);
 
@@ -21,7 +21,7 @@ describe("Evaluate", () => {
 	}, 100);
 
 	it("should compute from object", async () => {
-		const value = await client.evaluate((arg) => {
+		const value = await client.evaluate((_helper, arg) => {
 			return arg.bananas * 2;
 		}, { bananas: 1 });
 

packages/server/src/cli.ts

@@ -1,12 +1,13 @@
 import { field, logger } from "@coder/logger";
 import { ServerMessage, SharedProcessActiveMessage } from "@coder/protocol/src/proto";
 import { Command, flags } from "@oclif/command";
+import { fork, ForkOptions, ChildProcess } from "child_process";
 import * as fs from "fs";
 import * as os from "os";
 import * as path from "path";
 import * as WebSocket from "ws";
 import { createApp } from "./server";
-import { requireModule, requireFork } from "./vscode/bootstrapFork";
+import { requireModule, requireFork, forkModule } from "./vscode/bootstrapFork";
 import { SharedProcess, SharedProcessState } from "./vscode/sharedProcess";
 import { setup as setupNativeModules } from "./modules";
 import { fillFs } from "./fill";
@@ -161,6 +162,13 @@ export class Entry extends Command {
 			builtInExtensionsDirectory: builtInExtensionsDir,
 			dataDirectory: dataDir,
 			workingDirectory: workingDir,
+			fork: (modulePath: string, args: string[], options: ForkOptions, dataDir?: string): ChildProcess => {
+				if (options && options.env && options.env.AMD_ENTRYPOINT) {
+					return forkModule(options.env.AMD_ENTRYPOINT, args, options, dataDir);
+				}
+
+				return fork(modulePath, args, options);
+			},
 		}, password, hasCustomHttps ? {
 			key: certKeyData,
 			cert: certData,

packages/tunnel/yarn.lock

@@ -0,0 +1,4 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+

packages/vscode/src/dialog.ts

@@ -380,7 +380,7 @@ class Dialog {
 	}
 
 	private async list(directory: string): Promise<ReadonlyArray<DialogEntry>> {
-		return ideClient.evaluate((directory) => {
+		return ideClient.evaluate((_helper, directory) => {
 			const fs = __non_webpack_require__("fs") as typeof import("fs");
 			const util = __non_webpack_require__("util") as typeof import("util");
 			const path = __non_webpack_require__("path") as typeof import("path");

packages/vscode/src/fill/node-pty.ts

@@ -1,7 +1,7 @@
 import { client } from "@coder/ide/src/fill/client";
 import { EventEmitter } from "events";
 import * as nodePty from "node-pty";
-import { ActiveEval } from "@coder/protocol";
+import { ActiveEvalHelper } from "@coder/protocol";
 
 // Use this to prevent Webpack from hijacking require.
 declare var __non_webpack_require__: typeof require;
@@ -11,16 +11,15 @@ declare var __non_webpack_require__: typeof require;
  */
 class Pty implements nodePty.IPty {
 	private readonly emitter = new EventEmitter();
-	private readonly ae: ActiveEval;
+	private readonly ae: ActiveEvalHelper;
 	private _pid = -1;
 	private _process = "";
 
 	public constructor(file: string, args: string[] | string, options: nodePty.IPtyForkOptions) {
 		this.ae = client.run((ae, file, args, options) => {
 			const nodePty = __non_webpack_require__("node-pty") as typeof import("node-pty");
-			const { preserveEnv } = __non_webpack_require__("@coder/ide/src/fill/evaluation") as typeof import("@coder/ide/src/fill/evaluation");
 
-			preserveEnv(options);
+			ae.preserveEnv(options);
 
 			const ptyProc = nodePty.spawn(file, args, options);