[英]Webpack5 prevent fallback packages from being resolved when config is required in application
在 Webpack 5 中,移除了核心节点模块的 polyfill,而是需要在 resolve.fallback 属性中列出所需的包。 下面是 webpack.config.client.js 文件的解析属性。
resolve: {
fallback: {
path: require.resolve("path-browserify"),
crypto: require.resolve("crypto-browserify"),
"babel-polyfill": require.resolve("@babel/polyfill"),
buffer: require.resolve("buffer/"),
stream: require.resolve("stream-browserify"),
}
}
我使用 webpack-dev-middleware 和 webpack-hot-middleware 以及 express 来为我的 ssr 应用程序实现 HMR 的好处。
import express from "express";
import webpack from "webpack";
...
const app = express();
...
const webpackDevConfig = require("../webpack/webpack.config.client");
const compiler = webpack(webpackDevConfig);
app.use(
require("webpack-dev-middleware")(compiler, {
publicPath: webpackDevConfig.output.publicPath,
}),
);
app.use(require("webpack-hot-middleware")(compiler));
...
导入配置文件时,后备属性中的那些模块将被解析并以数字形式返回。 并且 webpack 在将配置 object 传递给其构造函数时引发错误,因为configuration.resolve.fallback属性应该是非空字符串,但给出了数字。
下面是实际传递的 resolve.fallback 属性,并返回了错误。
{
path: 79936 (which suppose to be "/some path/node_module/path/index.js",
crypto: 32640,
'babel-polyfill': 71202,
buffer: 30816,
stream: 78787
}
ValidationError: Invalid configuration object. Webpack has been initialized using a configuration object that does not match the API schema.
- configuration.resolve.fallback should be one of these:
[object { alias, name, onlyModule? }, ...] | object { <key>: [non-empty string, ...] | false | non-empty string }
-> Redirect module requests.
.....
使用Webpack Magic Comment ,则 webpack 不会捆绑导入的库。
const webpackDevConfig = require(/* webpackIgnore: true */ "../webpack/webpack.config.client");
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