--- /dev/null
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { Terminal, ITerminalAddon } from 'xterm';
+
+declare module 'xterm-addon-fit' {
+ /**
+ * An xterm.js addon that enables resizing the terminal to the dimensions of
+ * its containing element.
+ */
+ export class FitAddon implements ITerminalAddon {
+ /**
+ * Creates a new fit addon.
+ */
+ constructor();
+
+ /**
+ * Activates the addon
+ * @param terminal The terminal the addon is being loaded in.
+ */
+ public activate(terminal: Terminal): void;
+
+ /**
+ * Disposes the addon.
+ */
+ public dispose(): void;
+
+ /**
+ * Resizes the terminal to the dimensions of its containing element.
+ */
+ public fit(): void;
+
+ /**
+ * Gets the proposed dimensions that will be used for a fit.
+ */
+ public proposeDimensions(): ITerminalDimensions;
+ }
+
+ /**
+ * Reprepresents the dimensions of a terminal.
+ */
+ export interface ITerminalDimensions {
+ /**
+ * The number of rows in the terminal.
+ */
+ rows: number;
+
+ /**
+ * The number of columns in the terminal.
+ */
+ cols: number;
+ }
+}