Add back typescript version number and add Deno.version object.

[kt3k]

This is a continuation of #1676. This adds back the printing of typescript version number.
This also addresses the comment:

t would be good to have access to the versions in the runtime environment - maybe that can be done as part of this work... deno.version.v8 for example would be nice to have.

This PR uses rollup-plugin-replace for embedding typescript version in the bundle.

---

depends on denoland/deno_third_party#33

[kitsonk]

Couple comments.

Also the diff is pulling in sourcemap-codec into third_party/node_modules and I am not sure why. Seems like something we don't want/need in the project.

[kitsonk]

Instead of this, I would just add it to the globals in globals.ts:

deno/js/globals.ts

Lines 35 to 38 in 4dc4329

	declare global {
	const console: consoleTypes.Console;
	const setTimeout: typeof timers.setTimeout;
	}

Then you won't need an additional type declaration file.

[kt3k]

The situation seems a little tricky here. rollup-plugin-replace replaces the occurence even in type declaration. So const TS_VERSION: string becomes const "3.2.1": string; before passed to typescript.

I found that rollup-plugin-replace doesn't do any parsing of the source code. So we can do something like: { version: "TS_VERSION" }. This seems better because it doesn't require any type declaration. So I swtich to this pattern.

[kitsonk]

I would consider adding a set function that is exported from version.ts and marked @internal to do the setting, like we have with setEnv() now. This will make it more maintainable in the long term and keep logic out of here. And setVersions() should freeze the version object too.

[kt3k]

@kitsonk

the diff is pulling in sourcemap-codec into third_party/node_modules and I am not sure why. Seems like something we don't want/need in the project.

rollup-plugin-replace@2.1.0 depends on magic-string@^0.25.1.
magic-string seems depending on sourcemap-codec since v0.23.0 Rich-Harris/magic-string#133

If we pinned the version of rollup-plugin-replace to v2.0.0 which depends magic-string@^0.22.4, we would remove sourcemap-codec dependecy. But I'm not sure that is the desired solution.

[kitsonk]

One final comment.

I understand the sourcemap-codec as well now, so am ok with that.

[kitsonk]

I would set this to @internal so it doesn't get leaked to the runtime type library.

[kitsonk]

LGTM

[ry]

LGTM - this is great to have back - and also Deno.version - thank you!