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loader.test.js
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import path from "path";
import { version } from "webpack";
import postcssPresetEnv from "postcss-preset-env";
import {
compile,
getCompiler,
getErrors,
getExecutedCode,
getModuleSource,
getWarnings,
} from "./helpers/index";
jest.setTimeout(10000);
describe("loader", () => {
it("should work", async () => {
const compiler = getCompiler("./basic.js");
const stats = await compile(compiler);
expect(getModuleSource("./basic.css", stats)).toMatchSnapshot("module");
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should work with empty css", async () => {
const compiler = getCompiler("./empty.js");
const stats = await compile(compiler);
expect(getModuleSource("./empty.css", stats)).toMatchSnapshot("module");
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should work with empty options", async () => {
const compiler = getCompiler("./basic.js", {});
const stats = await compile(compiler);
expect(getModuleSource("./basic.css", stats)).toMatchSnapshot("module");
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it('should work with "asset" module type', async () => {
const isWebpack5 = version[0] === "5";
const config = {
module: {
rules: [
{
test: /\.css$/i,
use: [
{
loader: path.resolve(__dirname, "../src"),
},
],
},
isWebpack5
? {
test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/i,
type: "asset",
}
: {
test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/i,
loader: "file-loader",
options: { name: "[name].[ext]" },
},
],
},
};
if (isWebpack5) {
config.experiments = { asset: true };
config.output = {
path: path.resolve(__dirname, "outputs"),
filename: "[name].bundle.js",
chunkFilename: "[name].chunk.js",
publicPath: "/webpack/public/path/",
assetModuleFilename: "[name][ext]",
};
}
const compiler = getCompiler("./basic.js", {}, config);
const stats = await compile(compiler);
expect(getModuleSource("./basic.css", stats)).toMatchSnapshot("module");
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should throws error when no loader(s) for assets", async () => {
const compiler = getCompiler(
"./basic.js",
{},
{
module: {
rules: [
{
test: /\.css$/i,
loader: path.resolve(__dirname, "../src"),
},
],
},
}
);
const stats = await compile(compiler);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should throw error on invalid css syntax", async () => {
const compiler = getCompiler("./error.js", {});
const stats = await compile(compiler);
expect(
stats.compilation.fileDependencies.has(
path.resolve("./test/fixtures/error.css")
)
).toBe(true);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats, false, "postcss")).toMatchSnapshot("errors");
});
it('should reuse `ast` from "postcss-loader"', async () => {
const spy = jest.fn();
const compiler = getCompiler(
"./postcss-present-env/source.js",
{},
{
module: {
rules: [
{
test: /\.css$/i,
rules: [
{
loader: path.resolve(__dirname, "../src"),
options: { importLoaders: 1 },
},
{
loader: require.resolve("./helpers/ast-loader"),
options: { spy },
},
],
},
{
test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/,
loader: "file-loader",
options: { name: "[name].[ext]" },
},
],
},
}
);
const stats = await compile(compiler);
expect(spy).toHaveBeenCalledTimes(1);
expect(
getModuleSource("./postcss-present-env/source.css", stats)
).toMatchSnapshot("module");
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it('should work with "sass-loader"', async () => {
const compiler = getCompiler(
"./scss/source.js",
{},
{
module: {
rules: [
{
test: /\.s[ca]ss$/i,
rules: [
{ loader: path.resolve(__dirname, "../src") },
{
loader: "sass-loader",
options: {
// eslint-disable-next-line global-require
implementation: require("sass"),
},
},
],
},
],
},
}
);
const stats = await compile(compiler);
expect(getModuleSource("./scss/source.scss", stats)).toMatchSnapshot(
"module"
);
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should work with ModuleConcatenationPlugin", async () => {
const compiler = getCompiler(
"./basic.js",
{},
{
mode: "production",
module: {
rules: [
{
test: /\.css$/i,
use: [
{
loader: path.resolve(__dirname, "../src"),
options: { esModule: true },
},
],
},
{
test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/,
loader: "file-loader",
options: { name: "[name].[ext]", esModule: true },
},
],
},
}
);
const stats = await compile(compiler);
if (stats.compilation.modules.size) {
expect(stats.compilation.modules.size).toBe(10);
} else {
expect(stats.compilation.modules.length).toBe(6);
}
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should work with ModuleConcatenationPlugin (file-loader)", async () => {
const compiler = getCompiler(
"./basic.js",
{},
{
mode: "production",
module: {
rules: [
{
test: /\.css$/i,
loader: path.resolve(__dirname, "../src"),
},
{
test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/,
loader: "file-loader",
options: { name: "[name].[ext]", esModule: true },
},
],
},
}
);
const stats = await compile(compiler);
if (stats.compilation.modules.size) {
expect(stats.compilation.modules.size).toBe(10);
} else {
expect(stats.compilation.modules.length).toBe(6);
}
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should work with ModuleConcatenationPlugin (url-loader)", async () => {
const compiler = getCompiler(
"./basic.js",
{},
{
mode: "production",
module: {
rules: [
{
test: /\.css$/i,
loader: path.resolve(__dirname, "../src"),
},
{
test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/,
loader: "url-loader",
options: { name: "[name].[ext]", limit: true, esModule: true },
},
],
},
}
);
const stats = await compile(compiler);
if (stats.compilation.modules.size) {
expect(stats.compilation.modules.size).toBe(9);
} else {
expect(stats.compilation.modules.length).toBe(6);
}
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("issue #1033", async () => {
const compiler = getCompiler("./modules/issue-1033/issue-1033.js", {
modules: {
mode: "local",
localIdentName: "_[local]",
exportOnlyLocals: true,
},
});
const stats = await compile(compiler);
expect(
getModuleSource("./modules/issue-1033/issue-1033.css", stats)
).toMatchSnapshot("module");
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("issue #1033 (2)", async () => {
const compiler = getCompiler("./modules/issue-1033/issue-1033.js", {
modules: { mode: "local", localIdentName: "_[local]" },
});
const stats = await compile(compiler);
expect(
getModuleSource("./modules/issue-1033/issue-1033.css", stats)
).toMatchSnapshot("module");
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should throw an error on invisible spaces", async () => {
const compiler = getCompiler("./invisible-space.js");
const stats = await compile(compiler);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats, false, "postcss")).toMatchSnapshot("errors");
});
it('should work with the "modules.auto" option and the "importLoaders" option', async () => {
const compiler = getCompiler(
"./integration/index.js",
{},
{
module: {
rules: [
{
test: /\.((c|sa|sc)ss)$/i,
rules: [
{
loader: path.resolve(__dirname, "../src"),
options: {
// Run only `postcss-loader` on each `@import`
// If you need run `sass-loader` and `postcss-loader` please set it to `2`
importLoaders: 1,
// Automatically enable css modules for files satisfying `/\.module\.\w+$/i` RegExp.
modules: { auto: true },
},
},
{
loader: "postcss-loader",
options: {
postcssOptions: {
plugins: [postcssPresetEnv({ stage: 0 })],
},
},
},
// Can be `less-loader`
// The `test` property should be `\.less/i`
{
test: /\.s[ac]ss$/i,
loader: "sass-loader",
},
],
},
{
test: /\.(png|jpe?g|gif|svg|eot|ttf|woff|woff2)$/i,
loader: "url-loader",
options: {
limit: 8192,
},
},
],
},
}
);
const stats = await compile(compiler);
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should work with none AST metadata", async () => {
const compiler = getCompiler(
"./simple.js",
{},
{
module: {
rules: [
{
test: /\.css$/i,
rules: [
{
loader: path.resolve(__dirname, "../src"),
},
{
loader: path.resolve(__dirname, "../test/helpers/preLoader"),
},
],
},
],
},
}
);
const stats = await compile(compiler);
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it('should not generate console.warn when plugins disabled and hideNothingWarning is "true"', async () => {
jest.spyOn(console, "warn").mockImplementation(() => {});
const compiler = getCompiler("./empty.js", {
import: false,
url: false,
});
const stats = await compile(compiler);
// eslint-disable-next-line no-console
expect(console.warn).not.toHaveBeenCalledWith(
"You did not set any plugins, parser, or stringifier. " +
"Right now, PostCSS does nothing. Pick plugins for your case " +
"on https://www.postcss.parts/ and use them in postcss.config.js."
);
expect(getModuleSource("./empty.css", stats)).toMatchSnapshot("module");
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should pass queries to other loader", async () => {
const compiler = getCompiler(
"./other-loader-query.js",
{},
{
module: {
rules: [
{
test: /\.svg$/i,
resourceQuery: /color/,
enforce: "pre",
use: {
loader: path.resolve(
__dirname,
"./helpers/svg-color-loader.js"
),
},
},
{
test: /\.css$/i,
rules: [{ loader: path.resolve(__dirname, "../src") }],
},
],
},
}
);
const stats = await compile(compiler);
expect(getModuleSource("./other-loader-query.css", stats)).toMatchSnapshot(
"module"
);
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should work with webpackIgnore comment", async () => {
const compiler = getCompiler("./webpackIgnore.js");
const stats = await compile(compiler);
expect(getModuleSource("./webpackIgnore.css", stats)).toMatchSnapshot(
"module"
);
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
it("should work with inline module syntax", async () => {
const compiler = getCompiler(
"./index-loader-syntax.js",
{},
{
module: {
rules: [
{
test: /\.s?[ca]ss$/i,
rules: [
{
loader: path.resolve(__dirname, "../src"),
options: { importLoaders: 1 },
},
{
loader: "sass-loader",
},
],
},
],
},
}
);
const stats = await compile(compiler);
expect(getModuleSource("./index-loader-syntax.css", stats)).toMatchSnapshot(
"module"
);
expect(getExecutedCode("main.bundle.js", compiler, stats)).toMatchSnapshot(
"result"
);
expect(getWarnings(stats)).toMatchSnapshot("warnings");
expect(getErrors(stats)).toMatchSnapshot("errors");
});
});