@tdb/util/lib/helpers/css/head.js

Shared helpers and utilities.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var constants_1 = require("../../constants");
function importStylesheet(url) {
    if (!constants_1.IS_BROWSER) {
        return;
    }
    if (exists('style', url)) {
        return;
    }
    var head = document.head;
    var style = document.createElement('style');
    style.type = 'text/css';
    var css = "@import url('" + url + "')";
    style.dataset.url = url;
    style.appendChild(document.createTextNode(css));
    head.appendChild(style);
}
exports.importStylesheet = importStylesheet;
function exists(tag, url) {
    return constants_1.IS_BROWSER ? Boolean(findByUrl(tag, url)) : false;
}
function findByUrl(tag, url) {
    if (constants_1.IS_BROWSER) {
        var items = Array.from(document.getElementsByTagName(tag));
        return items.find(function (style) { return style.dataset.url === url; });
    }
    else {
        return undefined;
    }
}