feat(bundler): inlining/dead-code-elimination for import.meta.main (and --compile)

[paperdave]

What does this PR do?

Fixes #6009
Fixes #9366

1. The value for import.meta.main is inlined to be true for bundler entry-points.

export function run() {
  console.log("running");
}

if (import.meta.main) {
  run();
}

2. The expression require.main == module is now special cased to not not mark a module as CommonJS. This allows it to participate in the inlining.

import "fs";

if (typeof require !== "undefined" && require.main === module) {
  console.log("y u do dis");
}

Both of the above also support future --format=cjs (needed for js runtime that uses real commonjs modules) where import.meta.main when not known at bundle-time will emit require.main == module (one equal because it is shorter). Inverting this condition will correctly print require.main != module

3. Support import.meta.main in --target=node

Node.js does not support import.meta.main, so this rewrites both forms into something that will actually work at runtime, as previously neither would.

console.log(import.meta.main);
console.log(require.main == module);

Will bundle to

import {createRequire} from "node:module";
var __require = createRequire(import.meta.url);

// import_meta_main.ts
console.log(__require.main == __require.module);
console.log(__require.main == __require.module);

TODO: This needs a two at-runtime tests, one for commonjs, one for esm. then one file for for true and false

[robobun]

❌ @paperdave, your commit 822428e has 20 failures in #1103