Experiment: Replace lerna/fluid-build with pnpm and lage

[tylerbutler]

This draft PR is an experiment of replacing our custom fluid-build tool and lerna with pnpm workspaces and lage.

I do not intend to check this in; I am sharing it in case anyone else is investigating speeding up our build system.

Goals of the experiment:

• Speed up installation/bootstrapping of a new Fluid repo clone.
• Speed up experimentation with new packages or mass package upgrades (no lengthy lerna bootstrap step to change deps).
• Save disk space when using multiple Fluid repo clones.
• Determine what, if anything, doesn't work in this setup.

How to try it

1. Install pnpm globally: npm i -g pnpm.
2. Run pnpm install.
3. Use pnpm run lage -- build to run a build using lage.
4. You can also bypass lage and use pnpm to build directly using pnpm run tsc.

Note that the build will fail. Likely with an error like this:

ERR! Running C:\Program Files\nodejs\pnpm.CMD run tsc
ERR! > @fluidframework/odsp-driver@0.31.0 tsc E:\code\FluidFramework3\packages\drivers\odsp-driver
ERR! > tsc
ERR! src/test/mockFetch.ts(25,23): error TS2345: Argument of type 'Promise<{ ok: boolean; status: number; text: () => Promise<string>; headers: Headers; }>' is not assignable to parameter of type 'Promise<Response>'.
ERR!   Type '{ ok: boolean; status: number; text: () => Promise<string>; headers: Headers; }' is missing the following properties from type 'Response': clone, redirected, statusText, type, and 10 more.

That's the current state. I may work on it some more but feel free to take it and run if you're interested.

[tylerbutler]

@christiango I noticed you're a contributor to lage so you might be interested in this.

[christiango]

Thanks for the heads up! Some teams at Microsoft have recently moved from PNPM to Yarn, so it may be worth getting plugged into those conversations to get the full context. Office Online did this recently.

That being said, lage should be a choice independent of your package manager choice.

[SamBroner]

Very neat. What kind of perf improvements do you see?

[tylerbutler]

Thanks for the heads up! Some teams at Microsoft have recently moved from PNPM to Yarn, so it may be worth getting plugged into those conversations to get the full context. Office Online did this recently.

That being said, lage should be a choice independent of your package manager choice.

See PR #4804 for the yarn side of the experiment. Let's move most of the discussion there regarding comparing the two options.

Very neat. What kind of perf improvements do you see?

I haven't done formal tests yet but it feels much faster, especially when updating dependencies or installing multiple clones.