Created
November 24, 2020 16:30
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html-webpack-pluginのtemplateの実装
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import type HtmlWebpackPlugin from "html-webpack-plugin"; | |
import React, { FC, ReactElement } from "react"; | |
import { renderToString } from "react-dom/server"; | |
import { ServerStyleSheet, createGlobalStyle } from "styled-components"; | |
function route(action: string): ReactElement { | |
switch (action) { | |
case "page1": { | |
return <Page1 />; | |
} | |
case "page2": { | |
return <Page2 />; | |
} | |
default: { | |
throw new Error("ありえない chunks が設定されているのでエラー"); | |
} | |
} | |
} | |
function validateChunks( | |
chunks: HtmlWebpackPlugin.TemplateParameter["htmlWebpackPlugin"]["options"]["chunks"] | |
): asserts chunks is [string] { | |
if (!chunks) { | |
throw new Error("chunks というパラメータがないのは想定外なのでエラー"); | |
} | |
if (chunks === "all") { | |
throw new Error('chunks が "all" になっているのは想定外なのでエラー'); | |
} | |
if (chunks.length !== 1) { | |
throw new Error("chunks の要素が 1 つじゃないのは想定外なのでエラー"); | |
} | |
} | |
export default ({ | |
htmlWebpackPlugin: { | |
options: { chunks }, | |
}, | |
}: HtmlWebpackPlugin.TemplateParameter): string => { | |
validateChunks(chunks); | |
const [action] = chunks; | |
const sheet = new ServerStyleSheet(); | |
const reactDom = renderToString(sheet.collectStyles(route(action))); | |
const styleTags = sheet.getStyleTags(); | |
return templateHtml(action, reactDom, styleTags); | |
}; |
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