Some cleanup

- Use whateverEmitter.event for the onWhatever methods.
- Add readonly to a bunch of things.
- Remove some redundancy in types.
- Move initializations out of the constructor and into the declarations
  where it was reasonable to do so.
- Disable a few no-any violations.

packages/ide/src/fill/client.ts

@@ -9,36 +9,28 @@ import { retry } from "../retry";
  */
 class Connection implements ReadWriteConnection {
 	private activeSocket: WebSocket | undefined;
-	private readonly messageEmitter: Emitter<Uint8Array> = new Emitter();
-	private readonly closeEmitter: Emitter<void> = new Emitter();
-	private readonly upEmitter: Emitter<void> = new Emitter();
-	private readonly downEmitter: Emitter<void> = new Emitter();
-	private readonly messageBuffer: Uint8Array[] = [];
-	private socketTimeoutDelay = 60 * 1000;
-	private retryName = "Socket";
+	private readonly messageBuffer = <Uint8Array[]>[];
+	private readonly socketTimeoutDelay = 60 * 1000;
+	private readonly retryName = "Socket";
 	private isUp: boolean = false;
 	private closed: boolean = false;
 
+	private readonly messageEmitter = new Emitter<Uint8Array>();
+	private readonly closeEmitter = new Emitter<void>();
+	private readonly upEmitter = new Emitter<void>();
+	private readonly downEmitter = new Emitter<void>();
+
+	public readonly onUp = this.upEmitter.event;
+	public readonly onClose = this.closeEmitter.event;
+	public readonly onDown = this.downEmitter.event;
+	public readonly onMessage = this.messageEmitter.event;
+
 	public constructor() {
 		retry.register(this.retryName, () => this.connect());
 		retry.block(this.retryName);
 		retry.run(this.retryName);
 	}
 
-	/**
-	 * Register a function to be called when the connection goes up.
-	 */
-	public onUp(cb: () => void): void {
-		this.upEmitter.event(cb);
-	}
-
-	/**
-	 * Register a function to be called when the connection goes down.
-	 */
-	public onDown(cb: () => void): void {
-		this.downEmitter.event(cb);
-	}
-
 	public send(data: Buffer | Uint8Array): void {
 		if (this.closed) {
 			throw new Error("web socket is closed");
@@ -50,14 +42,6 @@ class Connection implements ReadWriteConnection {
 		}
 	}
 
-	public onMessage(cb: (data: Uint8Array | Buffer) => void): void {
-		this.messageEmitter.event(cb);
-	}
-
-	public onClose(cb: () => void): void {
-		this.closeEmitter.event(cb);
-	}
-
 	public close(): void {
 		this.closed = true;
 		this.dispose();

packages/ide/src/fill/clipboard.ts

@@ -1,11 +1,11 @@
-import { IDisposable } from "@coder/disposable";
 import { Emitter } from "@coder/events";
 
 /**
  * Wrapper around the native clipboard with some fallbacks.
  */
 export class Clipboard {
-	private readonly enableEmitter: Emitter<boolean> = new Emitter();
+	private readonly enableEmitter = new Emitter<boolean>();
+	public readonly onPermissionChange = this.enableEmitter.event;
 	private _isEnabled: boolean = false;
 
 	/**
@@ -70,14 +70,6 @@ export class Clipboard {
 		// tslint:enable no-any
 	}
 
-	/**
-	 * Register a function to be called when the native clipboard is
-	 * enabled/disabled.
-	 */
-	public onPermissionChange(cb: (enabled: boolean) => void): IDisposable {
-		return this.enableEmitter.event(cb);
-	}
-
 	/**
 	 * Read text from the clipboard.
 	 */

packages/ide/src/fill/dialog.ts

@@ -1,4 +1,3 @@
-import { IDisposable } from "@coder/disposable";
 import { Emitter } from "@coder/events";
 
 import "./dialog.scss";
@@ -27,19 +26,16 @@ export enum IKey {
 }
 
 export class Dialog {
-	private options: IDialogOptions;
-	private overlay: HTMLElement;
+	private readonly overlay: HTMLElement;
 	private cachedActiveElement: HTMLElement | undefined;
 	private input: HTMLInputElement | undefined;
-	private actionEmitter: Emitter<IDialogAction>;
 	private errors: HTMLElement;
 	private buttons: HTMLElement[] | undefined;
 
-	public constructor(options: IDialogOptions) {
-		this.options = options;
-
-		this.actionEmitter = new Emitter();
+	private actionEmitter = new Emitter<IDialogAction>();
+	public onAction = this.actionEmitter.event;
 
+	public constructor(private readonly options: IDialogOptions) {
 		const msgBox = document.createElement("div");
 		msgBox.classList.add("msgbox");
 
@@ -108,13 +104,6 @@ export class Dialog {
 		});
 	}
 
-	/**
-	 * Register a function to be called when the user performs an action.
-	 */
-	public onAction(callback: (action: IDialogAction) => void): IDisposable {
-		return this.actionEmitter.event(callback);
-	}
-
 	/**
 	 * Input value if this dialog has an input.
 	 */

packages/ide/src/fill/os.ts

@@ -13,7 +13,7 @@ class OS {
 
 	public homedir(): string {
 		if (typeof this._homedir === "undefined") {
-			throw new Error("not initialized");
+			throw new Error("trying to access homedir before it has been set");
 		}
 
 		return this._homedir;
@@ -21,7 +21,7 @@ class OS {
 
 	public tmpdir(): string {
 		if (typeof this._tmpdir === "undefined") {
-			throw new Error("not initialized");
+			throw new Error("trying to access tmpdir before it has been set");
 		}
 
 		return this._tmpdir;