Ramin B 53c87a1624 Allow null in CompletionCallback type (#42802) ...

The current `CompletionCallback` type doesn't allow you to set `error: null`, which is required if you don't have an actual error. This change allows for that

2020-03-13 18:45:16 -07:00

..

test

…

index.d.ts

…

tsconfig.json

…

tslint.json

…