Revert "chore(build): Bump Typescript to 3.9.2"

[telamonian]

• fixes [Critical Bug] Changes to JSONObject in coreutils@1.5.1 are breaking jupyterlab extension builds #83

This reverts commit 36debf6.

[blink1073]

Thanks!

[blink1073]

I'll merge and release in the morning

[GordonSmith]

I believe this all stems from a breaking change in the TypeScript language specification for unions and intersections - specifically this one: https://github.com/microsoft/TypeScript/wiki/Breaking-Changes#stricter-checks-on-intersections-and-optional-properties

I haven't looked at what broke in the dependent code - but it may be a matter of adding Partial<xxx> wrapper around the message type?

FWIW some of the base types in the Lumino messaging library are simply wrong with the latest compiler (they end up evaluating to {}).

@telamonian - can I suggest you add some new unit tests which replicate the issues you hit and I can take a another look to see if there is a more "flexible" fix?

[blink1073]

@GordonSmith I am going to release a patch with this fix to unstick the majority of folks and then we can find a new path forward.

[blink1073]

For now you can pin to the exact version that has TS 3.9.

[blink1073]

Here are the transitions:

• @lumino/example-datagrid: 0.6.0 => 0.6.1 (private)
• @lumino/example-datastore: 0.3.1 => 0.3.2 (private)
• @lumino/example-dockpanel: 0.3.1 => 0.3.2 (private)
• @lumino/algorithm: 1.3.1 => 1.3.2
• @lumino/application: 1.10.1 => 1.10.2
• @lumino/collections: 1.3.1 => 1.3.2
• @lumino/commands: 1.11.1 => 1.11.2
• @lumino/coreutils: 1.5.1 => 1.5.2
• @lumino/datagrid: 0.9.0 => 0.9.1
• @lumino/datastore: 0.10.1 => 0.10.2
• @lumino/default-theme: 0.4.1 => 0.4.2
• @lumino/disposable: 1.4.1 => 1.4.2
• @lumino/domutils: 1.2.1 => 1.2.2
• @lumino/dragdrop: 1.6.1 => 1.6.2
• @lumino/keyboard: 1.2.1 => 1.2.2
• @lumino/messaging: 1.4.1 => 1.4.2
• @lumino/polling: 1.3.1 => 1.3.2
• @lumino/properties: 1.2.1 => 1.2.2
• @lumino/signaling: 1.4.1 => 1.4.2
• @lumino/virtualdom: 1.7.1 => 1.7.2
• @lumino/widgets: 1.13.1 => 1.13.2

[blink1073]

published