Tree-Shaking

Use tree-shaking to automatically subset and include only the icons you’re using. Beginning with the excellent tool Rollup.js by Rich Harris, the concept of tree-shaking attempts to eliminate any unused code. Webpack 2 now includes this as well. The Font Awesome icon packages support tree-shaking out of the box but only if your tool is tree-shaking compatible. In this example, only faCoffee is imp

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font awesomeでTree Shakingするときに `collapse_vars` を無効にしないと聞かないというう話 https://github.com/webpack/webpack/issues/7742#issuecomment-406204762