@platform/css/lib/head/head.js

Helpers for working with inline CSS.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var common_1 = require("../common");
function init() {
    var importStylesheet = function (url) {
        if (!common_1.is.browser) {
            return res;
        }
        if (exists('style', url)) {
            return res;
        }
        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);
        return res;
    };
    var res = {
        importStylesheet: importStylesheet,
    };
    return res;
}
exports.init = init;
function exists(tag, url) {
    return common_1.is.browser ? Boolean(findByUrl(tag, url)) : false;
}
function findByUrl(tag, url) {
    if (common_1.is.browser) {
        var items = Array.from(document.getElementsByTagName(tag));
        return items.find(function (style) { return style.dataset.url === url; });
    }
    else {
        return undefined;
    }
}