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: / var / canvas / node_modules / nano-css / addon /
Filename : cssom.js
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'use strict';

exports.addon = function (renderer) {
    // CSSOM support only browser environment.
    if (!renderer.client) return;

    if (process.env.NODE_ENV !== 'production') {
        require('./__dev__/warnOnMissingDependencies')('cssom', renderer, ['sh']);
    }

    // Style sheet for media queries.
    document.head.appendChild(renderer.msh = document.createElement('style'));

    renderer.createRule = function (selector, prelude) {
        var rawCss = selector + '{}';
        if (prelude) rawCss = prelude + '{' + rawCss + '}';
        var sheet = prelude ? renderer.msh.sheet : renderer.sh.sheet;
        var index = sheet.insertRule(rawCss, sheet.cssRules.length);
        var rule = (sheet.cssRules || sheet.rules)[index];

        // Keep track of `index` where rule was inserted in the sheet. This is
        // needed for rule deletion.
        rule.index = index;

        if (prelude) {
            // If rule has media query (it has prelude), move style (CSSStyleDeclaration)
            // object to the "top" to normalize it with a rule without the media
            // query, so that both rules have `.style` property available.
            var selectorRule = (rule.cssRules || rule.rules)[0];
            rule.style = selectorRule.style;
            rule.styleMap = selectorRule.styleMap;
        }

        return rule;
    };
};