@cycle/dom/lib/es6/utils.js

The standard DOM Driver for Cycle.js, based on Snabbdom

function isValidNode(obj) {
    var ELEM_TYPE = 1;
    var FRAG_TYPE = 11;
    return typeof HTMLElement === 'object'
        ? obj instanceof HTMLElement || obj instanceof DocumentFragment
        : obj &&
            typeof obj === 'object' &&
            obj !== null &&
            (obj.nodeType === ELEM_TYPE || obj.nodeType === FRAG_TYPE) &&
            typeof obj.nodeName === 'string';
}
export function isClassOrId(str) {
    return str.length > 1 && (str[0] === '.' || str[0] === '#');
}
export function isDocFrag(el) {
    return el.nodeType === 11;
}
export function checkValidContainer(container) {
    if (typeof container !== 'string' && !isValidNode(container)) {
        throw new Error('Given container is not a DOM element neither a selector string.');
    }
}
export function getValidNode(selectors) {
    var domElement = typeof selectors === 'string'
        ? document.querySelector(selectors)
        : selectors;
    if (typeof selectors === 'string' && domElement === null) {
        throw new Error("Cannot render into unknown element `" + selectors + "`");
    }
    return domElement;
}
export function getSelectors(namespace) {
    var res = '';
    for (var i = namespace.length - 1; i >= 0; i--) {
        if (namespace[i].type !== 'selector') {
            break;
        }
        res = namespace[i].scope + ' ' + res;
    }
    return res.trim();
}
export function isEqualNamespace(a, b) {
    if (!Array.isArray(a) || !Array.isArray(b) || a.length !== b.length) {
        return false;
    }
    for (var i = 0; i < a.length; i++) {
        if (a[i].type !== b[i].type || a[i].scope !== b[i].scope) {
            return false;
        }
    }
    return true;
}
export function makeInsert(map) {
    return function (type, elm, value) {
        if (map.has(type)) {
            var innerMap = map.get(type);
            innerMap.set(elm, value);
        }
        else {
            var innerMap = new Map();
            innerMap.set(elm, value);
            map.set(type, innerMap);
        }
    };
}
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