loaderContext.loadModule API throw error when using with css-loader

[bighamD]

webpack.config.js:
        rules: [{
            test: /\.css$/,
            use: [
                'to-string-loader',
                'extract-loader',
                'css-loader',
        ]

My demo:

**### index.csss:**
@import './common.css';
text {
    color: aliceblue;
    background-image: url('https:www.baidu.com');
}

**common.css:**
body {
    border: 1px solid orangered;
}
@import './page/page.css';

**page.css:**
input {
    padding-left: 19px;
    border: 1px solid orangered;
}
@import './style/index.css';

**style/index.css:**
text {
    color: fsdfa;
}

when run script npm run build:

Below are error message:

**My solution:**
function loadModule(filename) {
       + let splits = filename.split("!");
        + let stringRequest = undefined;
        + if (splits[1]) {
            + const cssLoaderPath = loaderContext.remainingRequest.split('!')[0];
            + if (cssLoaderPath) {
                + stringRequest = stringifyRequest(loaderContext, cssLoaderPath);
            }
            + const splittedPart = splits[1].match(/^(.*?)(\?.*)/);
            + singlePath = splittedPart ? splittedPart[1] : splits[1];
            + let filePath = path.join(loaderContext.context, singlePath);
           + if (!fs.existsSync(filePath) && singlePath !== stringRequest) {
                + splits[1] = JSON.parse(stringRequest);
            }
        }
       + filename = splits.join("!");
        return new Promise((resolve, reject) => {
            loaderContext.loadModule(filename, (error, src) => {
                if (error) {
                    reject(error);
                } else {
                    resolve(src);
                }
            });
        });
    }
 I found 'stringifyRequest' is not corret, shoud fix it base on current loaderContext.