Without `from` option PostCSS could generate wrong source map and will not find Browserslist config.

错误信息

Without `from` option PostCSS could generate wrong source map and will not find Browserslist config. Set it to CSS file path or to `undefined` to prevent this warning.

解决方法

在“/node_modules/@ionic/app-scripts/dist/sass.js”路径的“sass.js”文件，在postcssOptions参数中添加“from: undefined”。添加后效果如下：

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var postcssOptions = {  

    from: undefined,  

    to: path_1.basename(sassConfig.outFile),  

    map: autoPrefixerMapOptions  

};