jodit/src/core/helpers/size/get-content-width.ts

Jodit is awesome and usefully wysiwyg editor with filebrowser

/*!
 * Jodit Editor (https://xdsoft.net/jodit/)
 * Released under MIT see LICENSE.txt in the project root for license information.
 * Copyright (c) 2013-2020 Valeriy Chupurnov. All rights reserved. https://xdsoft.net
 */

/**
 *
 * @param element
 * @param win
 */
export const getContentWidth = (element: HTMLElement, win: Window): number => {
	const pi = (value: string): number => parseInt(value, 10),
		style: CSSStyleDeclaration = win.getComputedStyle(element),
		width: number = element.offsetWidth,
		paddingLeft: number = pi(style.getPropertyValue('padding-left') || '0'),
		paddingRight: number = pi(
			style.getPropertyValue('padding-right') || '0'
		);

	return width - paddingLeft - paddingRight;
};