// Copyright: Ankitects Pty Ltd and contributors // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html /// Keep property if true. type StylingPredicate = (property: string, value: string) => boolean; const keep = (_key: string, _value: string) => true; const discard = (_key: string, _value: string) => false; /// Return a function that filters out certain styles. /// - If the style is listed in `exceptions`, the provided predicate is used. /// - If the style is not listed, the default predicate is used instead. function filterStyling( defaultPredicate: StylingPredicate, exceptions: Record, ): (element: HTMLElement) => void { return (element: HTMLElement): void => { // jsdom does not support @@iterator, so manually iterate const toRemove = [] as string[]; for (let i = 0; i < element.style.length; i++) { const key = element.style.item(i); const value = element.style.getPropertyValue(key); const predicate = exceptions[key] ?? defaultPredicate; if (!predicate(key, value)) { toRemove.push(key); } } for (const key of toRemove) { element.style.removeProperty(key); } }; } const nightModeExceptions = { "font-weight": keep, "font-style": keep, "text-decoration-line": keep, }; export const filterStylingNightMode = filterStyling(discard, nightModeExceptions); export const filterStylingLightMode = filterStyling(discard, { color: keep, "background-color": (_key: string, value: string) => value != "transparent", ...nightModeExceptions, }); export const filterStylingInternal = filterStyling(keep, { "background-color": discard, "font-size": discard, "font-family": discard, width: discard, height: discard, "max-width": discard, "max-height": discard, });