Add 'bundle' subcommand.

[kitsonk]

Resolves #2357

This PR adds the subcommand "bundle" to allow the output of a single file JavaScript file which can then be run by Deno without further dependencies.

This works by using the --outFile feature of TypeScript along with the AMD module format. AMD modules allow single file concatenation, which is not possible via ES Modules (or CommonJS). This means the bundle is fully valid JavaScript and just needs to be loaded via an AMD loader. There is a minimalistic loader in deno_std (see: denoland/std#480).

So to utilise this in action, you would do something like this:

$ deno bundle https://deno.land/x/oak/examples/server.ts oak_server.js

Which will output the source module to ./oak_server.js, which can then be run like:

$ deno -A https://deno.land/std/bundle/run.ts ./oak_server.js

I still need to:

• write tests

[ry]

Very nice - I'm able to run it - works great.

[ry]

Can you add a section to the manual describing the bundling operation briefly? (Maybe an example?)

[ry]

Can you give an example command here that can be copied and pasted, so people can try it out quickly?

Maybe use a remote URL, like

deno bundle https://deno.land/std/examples/colors.ts colors_bundle.js

[ry]

LGTM - thanks!

The real problematic block_on usage is here:

deno/cli/ops.rs

Lines 530 to 533 in 5960e39

	// WARNING: Here we use tokio_util::block_on() which starts a new Tokio
	// runtime for executing the future. This is so we don't inadvernently run
	// out of threads in the main runtime.
	Box::new(futures::future::result(tokio_util::block_on(fut)))

sorry wrong tab

[ry]

red

[ry]

This would be a cool feature for later:

default output filename

> deno bundle https://deno.land/std/examples/colors.ts
[1/1] Downloading https://deno.land/std/colors/mod.ts
Emitting bundle to "colors.bundle.js"...
9.2 kB emitted.

[ry]

LGTM - this is huge

[kitsonk]

Yeah, sorry, I went to bed. Thanks for the cleanup and stuff!