1 files changed, 8 insertions, 9 deletions
diff --git a/src/ClientUtils.ts b/src/ClientUtils.ts
index 0ab8ca55b..630d7edbc 100644
--- a/src/ClientUtils.ts
+++ b/src/ClientUtils.ts
@@ -450,30 +450,29 @@ export function smoothScrollHorizontal(duration: number, element: HTMLElement |
     animateScroll();
 }
 
-export function addStyleSheet(styleType: string = 'text/css') {
+export function addStyleSheet() {
     const style = document.createElement('style');
-    style.type = styleType;
     const sheets = document.head.appendChild(style);
-    return (sheets as any).sheet;
+    return sheets.sheet;
 }
-export function addStyleSheetRule(sheet: any, selector: any, css: any, selectorPrefix = '.') {
+export function addStyleSheetRule(sheet: CSSStyleSheet | null, selector: string, css: string | {[key:string]: string}, selectorPrefix = '.') {
     const propText =
         typeof css === 'string'
             ? css
             : Object.keys(css)
                   .map(p => p + ':' + (p === 'content' ? "'" + css[p] + "'" : css[p]))
                   .join(';');
-    return sheet.insertRule(selectorPrefix + selector + '{' + propText + '}', sheet.cssRules.length);
+    return sheet?.insertRule(selectorPrefix + selector + '{' + propText + '}', sheet.cssRules.length);
 }
-export function removeStyleSheetRule(sheet: any, rule: number) {
-    if (sheet.rules.length) {
+export function removeStyleSheetRule(sheet: CSSStyleSheet|null, rule: number) {
+    if (sheet?.rules.length) {
         sheet.removeRule(rule);
         return true;
     }
     return false;
 }
-export function clearStyleSheetRules(sheet: any) {
-    if (sheet.rules.length) {
+export function clearStyleSheetRules(sheet: CSSStyleSheet|null) {
+    if (sheet?.rules.length) {
         numberRange(sheet.rules.length).map(() => sheet.removeRule(0));
         return true;
     }