Support reading embedded files in compiled executables

[Jarred-Sumner]

This adds support for reading files embedded in executables created via bun build --compile.

The following snippet works now:

bun build --compile ./hello.ts

// hello.ts
import index from "./file.html";
import pic from "./favicon.png";
import { readFileSync } from "node:fs";
import { file, serve } from "bun";

serve({
  fetch(req) {
    const { pathname } = new URL(req.url);
    if (pathname === "/") {
      return new Response(file(index));
    }

    if (pathname === "/favicon.png") {
      return new Response(file(pic));
    }

    return new Response("Not found", { status: 404 });
  },
});

// Works with readFileSync() as well.
console.log("index.html is", readFileSync(index).byteLength, "bytes");

This adds support for Bun.file(path) and readFileSync(path). it doesn't add support for the rest of the node:fs functions.

Confusingly, outside of bun build --compile, the snippet above doesn't work without setting .html and .png to be a file loader:

bun --loader=.html:file --loader=.png:file ./hello.ts

[github-actions]

❌ @Jarred-Sumner 6 files with test failures on linux-x64-baseline:

• test/cli/install/bunx.test.ts
• test/js/bun/resolve/import-meta.test.js
• test/js/bun/websocket/websocket-server.test.ts
• test/js/third_party/prisma/prisma.test.ts
• test/js/web/fetch/fetch-leak.test.js
• test/js/web/websocket/websocket.test.js

View test output

^{#66d2f4dcd38a2696d9a7d439b3de6888c3dbf5ff}

[github-actions]

❌ @Jarred-Sumner 6 files with test failures on linux-x64:

• test/cli/install/bunx.test.ts
• test/js/bun/resolve/import-meta.test.js
• test/js/bun/websocket/websocket-server.test.ts
• test/js/third_party/prisma/prisma.test.ts
• test/js/web/fetch/fetch-leak.test.js
• test/js/web/websocket/websocket.test.js

View test output

^{#66d2f4dcd38a2696d9a7d439b3de6888c3dbf5ff}

[github-actions]

❌ @Jarred-Sumner 8 files with test failures on bun-darwin-x64-baseline:

• test/cli/install/bunx.test.ts
• test/js/bun/resolve/import-meta.test.js
• test/js/bun/spawn/spawn-streaming-stdin.test.ts
• test/js/bun/sqlite/sqlite.test.js
• test/js/bun/util/sleepSync.test.ts
• test/js/bun/websocket/websocket-server.test.ts
• test/js/web/timers/setTimeout.test.js
• test/js/web/websocket/websocket.test.js

View test output

^{#66d2f4dcd38a2696d9a7d439b3de6888c3dbf5ff}

[github-actions]

❌ @Jarred-Sumner 7 files with test failures on bun-darwin-aarch64:

• test/cli/install/bunx.test.ts
• test/js/bun/net/socket.test.ts
• test/js/bun/resolve/import-meta.test.js
• test/js/bun/test/test-test.test.ts
• test/js/bun/websocket/websocket-server.test.ts
• test/js/web/fetch/fetch-leak.test.js
• test/js/web/websocket/websocket.test.js

View test output

^{#66d2f4dcd38a2696d9a7d439b3de6888c3dbf5ff}

[alexlamsl]

more bun.String goodness 👍