fix(messaging): Remove non standard functions (setImmediate, clearImm…

[GordonSmith]

…ediate)

Remove non standard set/clear Immediate and replace them with an animationFrame polyfill

Signed-off-by: Gordon Smith gordonjsmith@gmail.com

[GordonSmith]

Depending on what browsers you support, there may be no need for the polyfill at all (IOW you could assume that requiestAnimationFrame always exists)?

[afshin]

The @lumino/messaging library is meant to support node as well. It is not browser-only, so the logic ought to remain as is.

[GordonSmith]

@afshin just to clarify, your closing because:

• All browsers have adequate requestAnimationFrame support
• If requestAnimationFrame is absent, your assuming its a NodeJS environment and setImmediate is known to exist
  ?

[afshin]

Yes, the browsers Lumino supports have requestAnimationFrame and the only other environment we currently expect this library to run in is node, which has setImmediate defined.

[GordonSmith]

Ok - works for me (FYI you will start to get TS syntax errors in the future - but a ts-ignore and suitable comment should be fine...)

[afshin]

Can we add "node" to the lib array in tsconfig.json to resolve that when it arises?

[GordonSmith]

Probably - but not with the current TS compiler version. (I will test later today - slowly working through my forks diffs).
FWIW you should avoid upgrading to TS compiler 3.7.x due to: microsoft/TypeScript#33939

[afshin]

Cool, thank you!

[GordonSmith]

Looks like there isn't a specific ts lib option for this. We can continue this discussion when I issue a PR for TSC 3.6.4

[afshin]

Cheers!