swc_bundler: support outputting an IIFE

[kitsonk]

Describe the feature

Currently, swc_bundler can output an ES module, but it does support output as an IIFE.

For outputting the bundle, instead of exporting entries from the entry module in the bundle, swc_bundler would output an IIFE where the return value of the IIFE is the value of the exported module. For example if the entry module was:

a.js

export const a = "a";

The output of the bundle would be something like:

a.bundle.js

(function () {
  "use strict";
  var __exports = {};
  Object.defineProperty(__exports, "__esModule", {
    value: true
  });
  __exports.a = "a";
  return __exports;
})();

Babel plugin or link to the feature description

There are Babel plugins that in theory can do this, but IIFE output is one of the builtin output formats of Rollup (and other bundlers).

Additional context

In particular with Deno, we would like to have an option for Deno.bundle() to be able to output a single file ES module or an IIFE.

[kitsonk]

A couple of other considerations:

• For emitting dynamic imports, assume that there is some sort of of import() global?

• Support TLA by emitting an async IIFE, meaning the consumer would need to figure out how to wait for the promise resolution. For example, given the input of:

  b.js

  export const b = await Promise.resolve("b");

  The output would be something like:

  b.bundle.js

  (async function () {
    "use strict";
    var __exports = {};
    Object.defineProperty(__exports, "__esModule", {
      value: true
    });
    __exports.b = await Promise.resolve("b");
    return __exports;
  })();

[ClarisL]

Hello,

I'm really interested in using the IIFE output from swc_bundler.
Happy to see this is now available !
Still I did not find any documentation regarding the setup part.

Do you have any piece of advice regarding how this can be setup ?
Thanks,

[swc-bot]

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