@yinxulai/rollup-plugin-less/lib/esnext/utils/insertStyle.js

SSR 支持 typescript 支持 转换 less 语法并支持 cssModule

export default function insertStyle(css) {
    if (!css)
        return;
    // 环境检查
    if (typeof (window) == 'undefined')
        return;
    if (typeof (document) == 'undefined')
        return;
    if (typeof (document.head) == 'undefined')
        return;
    function hash(input) {
        var hash = 5381;
        var i = input.length - 1;
        const I64BIT_TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-'.split('');
        if (typeof input == 'string') {
            for (; i > -1; i--)
                hash += (hash << 5) + input.charCodeAt(i);
        }
        else {
            for (; i > -1; i--)
                hash += (hash << 5) + input[i];
        }
        var value = hash & 0x7FFFFFFF;
        var retValue = '';
        do {
            retValue += I64BIT_TABLE[value & 0x3F];
        } while (value >>= 6);
        return retValue;
    }
    // 计算内容哈希
    const documentID = hash(css);
    if (document.getElementById(documentID))
        return;
    // 创建 style
    const style = document.createElement('style');
    style.id = documentID;
    style.innerHTML = css;
    // 插入 dom
    document.head.appendChild(style);
    return css;
}
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