对 webpack 非常陌生...我希望能够读取一个值，在本例中具体是env from webpack.config.js in a sass文件，这样我就可以根据环境有不同的CSS。
例如：
- env = 开发，颜色 = 绿色
- env = 生产，颜色 = 蓝色
到目前为止我一直专注于 sass-loader，尝试传递数据，但没有成功，$env当我运行时变量总是未定义npm run build:Debug（这运行webpack --app=all --env=development).
这些是我拥有的文件：
webpack.config.js
const path = require("path");
const common = require("./.webpack/webpack.common.config");
const config = [];
function addAppConfig(app) {
app.module = common.module;
app.resolve = common.resolve;
config.push(app);
}
module.exports = (env, argv) => {
switch (argv.app) {
// Add new configs to below
case "a":
addAppConfig(aa);
break;
case "b":
addAppConfig(bb);
break;
case "c":
addAppConfig(cc);
break;
default:
case "all":
addAppConfig(xyz);
}
switch (env) {
case "local":
config.forEach(appConfig => {
// The "development" mode configuration option tells webpack to use its built-in development optimizations
// https://webpack.js.org/configuration/mode/#mode-development
appConfig.mode = "development";
appConfig.output.path = path.resolve(__dirname, "../dist");
appConfig.output.publicPath = "http://localhost:3000/dist";
appConfig.devtool = "inline-source-map";
appConfig.devServer = {
contentBase: path.resolve(__dirname, "./public"),
port: "3000",
watchContentBase: true
};
});
break;
case "development":
config.forEach(appConfig => {
// The "development" mode configuration option tells webpack to use its built-in development optimizations
// https://webpack.js.org/configuration/mode/#mode-development
appConfig.mode = "development";
appConfig.devtool = "inline-source-map";
});
break;
default:
case "production":
config.forEach(appConfig => {
// The "production" mode configuration option tells webpack to use its built-in production optimizations including minification etc.
// https://webpack.js.org/configuration/mode/#mode-production
appConfig.mode = "production";
appConfig.devtool = "cheap-source-map";
});
break;
}
return config;
};
webpack.common.config.js - 这在 webpack.config.js 中使用
module.exports = {
module: {
rules: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
use: {
loader: "babel-loader"
}
},
{
test: /\.(s*)css$/,
use: [
{
loader: "file-loader",
options: {
name: "[name].css"
}
},
"extract-loader",
"css-loader",
"sass-loader"
]
},
{
test: /\.(png|jp(e*)g)$/,
use: [
{
loader: "url-loader",
options: {
// Convert images < 8kb to base64 strings
limit: 8000,
name: "images/[name].[ext]"
}
}
]
},
{
test: /\.(svg)$/,
use: [
{
loader: "url-loader",
options: {
// 80kb limit to avoid an IE11 display bug
limit: 80000,
name: "images/[name].[ext]"
}
}
]
},
{
test: /\.(woff|woff2|eot|ttf)$/,
use: [
{
loader: "url-loader",
options: {
// Convert images < 8kb to base64 strings
limit: 8000,
name: "fonts/[name].[ext]"
}
}
]
}
]
},
resolve: {
extensions: [".js", ".jsx"]
}
};
最后：
文件.scss
.aside__left, .aside__right {
@if $env == 'development' {
background-color: red;
} @else {
background-color: green;
}
background-color: $desiredColor;
}
有没有办法从 webpack 配置进行 scss 变量映射/传递，或者基于环境的任何其他方式，会生成不同的 css？
您可以使用以下方法将变量从 webpack 配置传递到 scss 文件：
{
loader: "sass-loader",
options: {
data: "$var1: " + yourVar1+ ";"
}
}
(c) https://github.com/webpack-contrib/sass-loader/issues/49#issuecomment-284131561 https://github.com/webpack-contrib/sass-loader/issues/49#issuecomment-284131561
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