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https://github.com/multipleof4/lynchmark.git
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41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
async function bundleApp(entryFile, files) {
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const Babel = (await import("https://unpkg.com/@babel/standalone/babel.min.js")).default;
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const graph = new Map;
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const processing = new Set;
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function resolve(from, to) {
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if (!to.startsWith(".")) return to;
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const parts = from.split("/");
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parts.pop();
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for (const p of to.split("/")) p === ".." ? parts.pop() : p && p !== "." && parts.push(p);
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return parts.join("/");
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}
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function extract(code) {
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const deps = [];
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code.replace(/require\s*\(\s*["'`]([^"'`]+)["'`]\s*\)/g, (_, d) => deps.push(d));
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return deps;
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}
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function walk(file) {
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if (graph.has(file)) return;
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if (processing.has(file)) throw new Error(`Circular: ${file}`);
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if (!(file in files)) throw new Error(`Missing: ${file}`);
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processing.add(file);
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const code = Babel.transform(files[file], { presets: [["env", { modules: "cjs" }]] }).code;
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const deps = extract(code).map(d => resolve(file, d));
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graph.set(file, { code, deps });
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deps.forEach(walk);
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processing.delete(file);
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}
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walk(entryFile);
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return `(function(){const modules={},cache={};function require(path){if(cache[path])return cache[path].exports;const module={exports:{}};cache[path]=module;const fn=modules[path];if(!fn) {
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throw new Error('Missing: ' + path);
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}fn(require,module,module.exports);return module.exports;}
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${Array.from(graph, ([p, {code}]) => `modules['${p}']=(function(require,module,exports){\n${code}\n});`).join("\n")}
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return require('${entryFile}');})()`;
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}
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export default bundleApp; |