[jest-worker]: bigInt serialization in jest-worker

[sauravhiremath]

Summary

Resolves #11617
Adds serialization support for BigInt Type - when passing messages through jest-worker processes (parallel runs not using worker-threads)

Test plan

• [jest-worker] Add a wrapper BigIntSerialization for messages sent through jest-worker

Update

• Added json-bigint package for serialization support
• Added tests

[codecov-commenter]

Codecov Report

Merging #11624 (4f7cd03) into master (edf2803) will decrease coverage by 0.00%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master   #11624      +/-   ##
==========================================
- Coverage   69.01%   69.01%   -0.01%     
==========================================
  Files         312      312              
  Lines       16335    16339       +4     
  Branches     4734     4735       +1     
==========================================
+ Hits        11274    11276       +2     
- Misses       5033     5035       +2     
  Partials       28       28              

Impacted Files	Coverage Δ
packages/jest-worker/src/workers/messageParent.ts	38.46% <0.00%> (ø)
packages/jest-worker/src/index.ts	97.91% <75.00%> (-2.09%)	⬇️
packages/jest-worker/src/workers/processChild.ts	94.11% <100.00%> (ø)
packages/expect/src/utils.ts	95.58% <0.00%> (-0.56%)	⬇️

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[SimenB]

Thanks! Could you add a test and a changelog entry?

[SimenB]

This seems odd to me - how does only serializing work when we don't deserialize? Isn't the BigInt lost? In which case it'll be reported wrong if passed across a worker

$ node -p 'const JSONbig = require("json-bigint"); JSONbig.parse(JSONbig.stringify({hello: BigInt(42)}));'
[Object: null prototype] { hello: 42 }

I'd like to see a test that sends an object to a worker and receives it back, and verifies they are equal.

This particular module also seems to be failing on Node 10.

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Also, at some point we need to add support for circular objects (#10577) for which this module won't work. We can tackle that later of course, just showing that we need to properly serialize/deserialize 🙂

[SimenB]

this should not be in index to avoid circular dependencies. Please stick it into a utils, serializers or something

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