Small cleanup to our web build scripts

- Update to Rollup 4.x
 - Replace terser and postcss with swc and lightningcss. This is
   definitely more code for us to write (maybe I should turn them into
   proper plugins we can depend on), but both speedier and fewer
   dependencies.
 - Drop dependency on glob - we can get away with fs.readdir for what we
   needed it for.

package.json

@@ -13,17 +13,16 @@
   },
   "devDependencies": {
     "@rollup/plugin-node-resolve": "^15.2.1",
-    "@rollup/plugin-terser": "^0.4.3",
     "@rollup/plugin-typescript": "^11.0.0",
     "@rollup/plugin-url": "^8.0.1",
-    "@types/glob": "^8.1.0",
-    "glob": "^10.3.4",
+    "@swc/core": "^1.3.92",
+    "@types/node": "^20.8.3",
+    "lightningcss": "^1.22.0",
     "preact-render-to-string": "^6.2.1",
     "rehype": "^13.0.0",
     "rehype-highlight": "^7.0.0",
     "rehype-react": "^8.0.0",
-    "rollup": "^3.19.1",
-    "rollup-plugin-postcss": "^4.0.2",
+    "rollup": "^4.0.0",
     "tsx": "^3.12.10",
     "typescript": "^5.2.2"
   }

projects/web/rollup.config.js

@@ -4,19 +4,109 @@
 
 import path from "path";
 
-import terser from "@rollup/plugin-terser";
 import resolve from "@rollup/plugin-node-resolve";
 import typescript from "@rollup/plugin-typescript";
 import url from "@rollup/plugin-url";
-import postcss from "rollup-plugin-postcss";
+import { minify as minifyJavascript } from "@swc/core";
+import { transform as transformCss } from "lightningcss";
 
-const input = "src/frontend";
+const inputDir = "src/frontend";
 
-const minify = args => !args.configDebug;
+/**
+ * Generate an ESM module from a list of {@code ligntingcss} exports.
+ *
+ * @param {string} filename The input file name.
+ * @param {string} input The input code.
+ * @param {boolean} minify Whether to minify the css.
+ * @returns {string} The ESM module, containing the list of exports.
+ */
+const compileCss = (filename, input, minify) => {
+    const { code, exports } = transformCss({
+        filename,
+        cssModules: filename.endsWith(".module.css"),
+        pattern: "[local]-[hash]",
+        code: Buffer.from(input),
+        minify,
+    });
+
+    let output = "";
+    let importId = 0;
+    for (const [name, symbol] of Object.entries(exports ?? {})) {
+        let className = JSON.stringify(symbol.name);
+        for (const dep of symbol.composes) {
+            if (dep.type == "dependency") {
+                output += `import { ${dep.name} as import_${++importId}$ } from ${JSON.stringify(dep.specifier)};\n`;
+                className += `+ " " + import_${importId}$`;
+            } else {
+                className += `+ " " + ${JSON.stringify(dep.name)}`;
+            }
+        }
+        output += `export const ${name} = ${className};\n`;
+    }
+
+    return { js: output, css: new TextDecoder().decode(code) };
+}
+
+/**
+ * Custom plugin for CC: Tweaked specific build logic.
+ *
+ * This handles:
+ *  - Minifying JS using swc, which is faster than using terser.
+ *  - Importing CSS files.
+ *  - Importing plain text files from our "mount/" directory.
+ *  - Resoving our TeaVM compiled classes and resources files.
+ *
+ * @param {boolean} minify Whether to minify our sources.
+ * @returns {@type import("rollup").Plugin} Our plugin.
+ */
+const ccTweaked = minify => {
+    let cssChunks = [];
+    return {
+        name: "cc-tweaked",
+
+        buildStart() {
+            cssChunks = [];
+        },
+
+        async renderChunk(code) {
+            // Use swc to minify our Javascript.
+            return minify ? (await minifyJavascript(code, { module: true })).code : code;
+        },
+
+        async transform(code, file) {
+            const ext = path.extname(file);
+            if (ext === ".css") {
+                // Compile our CSS file, emitting a JS module, and saving the CSS for later.
+                const { js, css } = compileCss(file, code, minify);
+                cssChunks.push(css);
+                return js;
+            } else if (ext != ".dfpwm" && path.dirname(file) === path.resolve(`${inputDir}/mount`)) {
+                // Bundle all mount files aside from our dfpwm.
+                return `export default ${JSON.stringify(code)};\n`
+            } else {
+                return null;
+            }
+        },
+
+        async resolveId(source) {
+            if (source === "cct/classes") return path.resolve("build/teaVM/classes.js");
+            if (source === "cct/resources") return path.resolve("build/teaVM/resources.js");
+            return null;
+        },
+
+        generateBundle() {
+            this.emitFile({
+                type: 'asset',
+                fileName: "index.css",
+                source: cssChunks.join(),
+            });
+        }
+    }
+};
 
 /** @type import("rollup").RollupOptionsFunction */
 export default args => ({
-    input: [`${input}/index.tsx`],
+    input: [`${inputDir}/index.tsx`],
     output: {
         // Also defined in build.gradle.kts
         dir: "build/rollup/",
@@ -40,29 +130,6 @@ export default args => ({
             limit: 0,
         }),
 
-        postcss({
-            namedExports: true,
-            minimize: minify(args),
-            extract: true,
-        }),
-
-        {
-            name: "cc-tweaked",
-            async transform(code, file) {
-                // Allow loading files in /mount.
-                const ext = path.extname(file);
-                return ext != ".dfpwm" && path.dirname(file) === path.resolve(`${input}/mount`)
-                    ? `export default ${JSON.stringify(code)};\n`
-                    : null;
-            },
-
-            async resolveId(source) {
-                if (source === "cct/classes") return path.resolve("build/teaVM/classes.js");
-                if (source === "cct/resources") return path.resolve("build/teaVM/resources.js");
-                return null;
-            },
-        },
-
-        minify(args) && terser(),
+        ccTweaked(!args.configDebug),
     ],
 });

projects/web/src/htmlTransform/index.tsx

@@ -11,7 +11,6 @@
  * Yes, this would be so much nicer with next.js.
  */
 import fs from "fs/promises";
-import { glob } from "glob";
 import path from "path";
 import { type JSX, h } from "preact";
 import renderToStaticMarkup from "preact-render-to-string";
@@ -54,12 +53,15 @@ import { type DataExport, WithExport } from "./components/WithExport";
 
     const dataExport = JSON.parse(await fs.readFile(dataFile, "utf-8")) as DataExport;
 
-    for (const file of await glob(sourceDir + "/**/*.html")) {
-        const contents = await fs.readFile(file, "utf-8");
+    for (const file of await fs.readdir(sourceDir, { withFileTypes: true, recursive: true })) {
+        if(!file.isFile() || !file.name.endsWith(".html")) continue;
+
+        const sourcePath = path.join(file.path, file.name);
+        const contents = await fs.readFile(sourcePath, "utf-8");
 
         const { result } = await processor.process(contents);
 
-        const outputPath = path.resolve(outputDir, path.relative(sourceDir, file));
+        const outputPath = path.resolve(outputDir, path.relative(sourceDir, sourcePath));
         await fs.mkdir(path.dirname(outputPath), { recursive: true });
         await fs.writeFile(outputPath, "<!doctype HTML>" + renderToStaticMarkup(<WithExport data={dataExport}>{result}</WithExport>));
     }

projects/web/tsconfig.json

@@ -27,6 +27,7 @@
         "allowSyntheticDefaultImports": true,
     },
     "include": [
-        "src",
+        "src/htmlTransform",
+        "src/frontend",
     ]
 }