// This script builds `sandbox.ts` and its dependencies into a single bundled
// file called `bundle.js`. It is used during Deno execution to avoid
// downloading modules during runtime in Firecracker microVMs.
import * as esbuild from "https://deno.land/x/esbuild@v0.20.0/mod.js";
import { dirname, fromFileUrl, join } from "https://deno.land/std/path/mod.ts";
import { denoPlugins } from "jsr:@luca/esbuild-deno-loader@^0.11.1";
export async function buildSandbox(outputPath?: string) {
const baseDir = dirname(fromFileUrl(import.meta.url));
const result = await esbuild.build({
plugins: denoPlugins({}),
entryPoints: [join(baseDir, "sandbox.ts")],
bundle: true,
format: "esm",
platform: "node",
write: false,
banner: {
js: `import { createRequire } from 'node:module';const require = createRequire(import.meta.url);// INJECTION_POINT - DO NOT REMOVE THIS LINE`,
},
define: {
"import.meta.main": "false",
"process.env.NODE_ENV": '"production"',
global: "globalThis",
},
sourcemap: false,
minify: true,
minifyWhitespace: true,
minifyIdentifiers: true,
minifySyntax: true,
treeShaking: true,
charset: "utf8",
legalComments: "none",
keepNames: false,
absWorkingDir: baseDir,
drop: ["debugger"],
});
if (!result.outputFiles?.[0]) {
throw new Error("❌ No output file generated by esbuild.");
}
const bundleContent = result.outputFiles[0].text;
const targetPath = outputPath ?? join(baseDir, "bundle.js");
await Deno.writeTextFile(targetPath, bundleContent);
console.log(
`✅ Built sandbox bundle → ${targetPath} (${bundleContent.length} bytes)`,
);
}
if (import.meta.main) {
const output = Deno.args[0];
await buildSandbox(output);
}
