49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
import { getNonce } from 'get-nonce';
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function makeStyleTag() {
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if (!document)
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return null;
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const tag = document.createElement('style');
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tag.type = 'text/css';
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const nonce = getNonce();
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if (nonce) {
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tag.setAttribute('nonce', nonce);
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}
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return tag;
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}
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function injectStyles(tag, css) {
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// @ts-ignore
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if (tag.styleSheet) {
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// @ts-ignore
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tag.styleSheet.cssText = css;
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}
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else {
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tag.appendChild(document.createTextNode(css));
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}
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}
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function insertStyleTag(tag) {
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const head = document.head || document.getElementsByTagName('head')[0];
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head.appendChild(tag);
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}
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export const stylesheetSingleton = () => {
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let counter = 0;
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let stylesheet = null;
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return {
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add: (style) => {
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if (counter == 0) {
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if ((stylesheet = makeStyleTag())) {
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injectStyles(stylesheet, style);
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insertStyleTag(stylesheet);
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}
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}
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counter++;
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},
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remove: () => {
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counter--;
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if (!counter && stylesheet) {
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stylesheet.parentNode && stylesheet.parentNode.removeChild(stylesheet);
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stylesheet = null;
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}
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},
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};
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};
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