feat: add custom json serializer support

[mkazlauskas]

Context

If you need to support numeric values larger than Number.MAX_SAFE_INTEGER, you can't use built-in JSON.parse/JSON.stringify.

While most JSON parsers assume numeric values have same precision restrictions as IEEE 754 double, JSON specification does not say anything about number precision. Any floating point number in decimal (optionally scientific) notation is valid JSON value. It's a good idea to serialize values which might fall out of IEEE 754 integer precision as strings in your JSON api, but { "value" : 9223372036854775807}, for example, is still a valid RFC4627 JSON string, and in most JS runtimes the result of JSON.parse is this object: { value: 9223372036854776000 }

source

Proposed solution

Add a new optional option: jsonSerializer

[rhyslbw]

Looks good. Seems like a solution that could be adopted upstream, and would be worth opening a PR so we can potentially drop the fork in the future.

$ yarn test
yarn run v1.22.17
$ yarn test:node && yarn test:dom
$ jest --testEnvironment node


 PASS  tests/document-node.test.ts (5.834 s)
 PASS  tests/gql.test.ts (5.846 s)
 PASS  tests/custom-fetch.test.ts (5.865 s)
 PASS  tests/general.test.ts (5.892 s)
 PASS  tests/batching.test.ts (5.9 s)
 PASS  tests/json-serializer.test.ts (5.939 s)
 PASS  tests/headers.test.ts (5.95 s)
 PASS  tests/endpoint.test.ts (5.958 s)
 PASS  tests/upload.test.ts (5.95 s)
 PASS  tests/signal.test.ts (6.067 s)

Test Suites: 10 passed, 10 total
Tests:       1 skipped55 passed, 56 total
Snapshots:   6 passed, 6 total
Time:        6.377 s
Ran all test suites.
$ jest --testEnvironment jsdom
 PASS  tests/document-node.test.ts (5.658 s)
 PASS  tests/upload.test.ts (5.694 s)
 PASS  tests/json-serializer.test.ts (5.681 s)
 PASS  tests/endpoint.test.ts (5.711 s)
 PASS  tests/batching.test.ts (5.719 s)
 PASS  tests/gql.test.ts (5.723 s)
 PASS  tests/general.test.ts (5.735 s)
 PASS  tests/custom-fetch.test.ts (5.747 s)
 PASS  tests/headers.test.ts (5.799 s)
 PASS  tests/signal.test.ts (5.829 s)

Test Suites: 10 passed, 10 total
Tests:       1 skipped, 55 passed, 56 total
Snapshots:   6 passed, 6 total
Time:        6.583 s, estimated 7 s
Ran all test suites.
Done in 14.22s.