core: add jsc loader

packages/hydrooj/bin/hydrooj.js

@@ -18,6 +18,7 @@ require('source-map-support').install({
 });
 const os = require('os');
 const path = require('path');
+const vm = require('vm');
 const fs = require('fs-extra');
 const argv = require('cac')().parse();
 const child = require('child_process');
@@ -60,6 +61,10 @@ function transform(filename) {
     return result.code;
 }
 const ESM = ['p-queue', 'p-timeout'];
+const _script = new vm.Script('"Hydro"', { produceCachedData: true });
+const bytecode = (_script.createCachedData && _script.createCachedData.call)
+    ? _script.createCachedData()
+    : _script.cachedData;
 require.extensions['.js'] = function loader(module, filename) {
     if (ESM.filter((i) => filename.includes(i)).length || major < 14) {
         return module._compile(transform(filename), filename);
@@ -70,6 +75,33 @@ require.extensions['.js'] = function loader(module, filename) {
 require.extensions['.ts'] = require.extensions['.tsx'] = function loader(module, filename) {
     return module._compile(transform(filename), filename);
 };
+require.extensions['.jsc'] = function loader(module, filename) {
+    const buf = fs.readFileSync(filename);
+    bytecode.slice(12, 16).copy(buf, 12);
+    if (![12, 13, 14, 15, 16, 17].filter((i) => process.version.startsWith(`v${i}`)).length) {
+        bytecode.slice(16, 20).copy(buf, 16);
+    }
+    // eslint-disable-next-line no-return-assign
+    const length = buf.slice(8, 12).reduce((sum, number, power) => sum += number * (256 ** power), 0);
+    let dummyCode = '';
+    if (length > 1) dummyCode = `"${'\u200b'.repeat(length - 2)}"`;
+    const script = new vm.Script(dummyCode, {
+        filename,
+        lineOffset: 0,
+        displayErrors: true,
+        cachedData: buf,
+    });
+    if (script.cachedDataRejected) throw new Error(`cacheDataRejected on ${filename}`);
+    const compiledWrapper = script.runInThisContext({
+        filename,
+        lineOffset: 0,
+        columnOffset: 0,
+        displayErrors: true,
+    });
+    const dirname = path.dirname(filename);
+    const args = [module.exports, require, module, filename, dirname, process, global];
+    return compiledWrapper.apply(module.exports, args);
+};
 
 function buildUrl(opts) {
     let mongourl = `${opts.protocol || 'mongodb'}://`;