Update docs section about typescript setup

[matthias-pichler]

What

Updated the docs section to include the setup for ts-jest >= 25.5.0

Why

ts-jest >= 25.5.0 introduces breaking changes that require additional configuration.

Notes

Closes #282

Housekeeping

• Unit tests
• Documentation is up to date
• No additional lint warnings
• Typescript definitions are added/updated where relevant

[villasv]

I also think it would be nice to warn users about declaration merging not working if you manually import the jest module as the jest docs comment: import { expect } from '@jest/globals.

It fails because jest-extended will merge its type declarations into the types provided by @types/jest. So if you use expect from @jest/globals, the added matchers won't be there.

[codecov]

Codecov Report

Merging #283 (a66120c) into main (437d55a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              main      #283    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          109       117     +8     
  Lines          554       738   +184     
  Branches        97       108    +11     
==========================================
+ Hits           554       738   +184     

Impacted Files	Coverage Δ
src/matchers/index.js	100.00% <0.00%> (ø)
src/matchers/toBeNaN/index.js	100.00% <0.00%> (ø)
src/matchers/toBeNil/index.js	100.00% <0.00%> (ø)
src/matchers/toBeOdd/index.js	100.00% <0.00%> (ø)
src/matchers/toBeDate/index.js	100.00% <0.00%> (ø)
src/matchers/toBeEven/index.js	100.00% <0.00%> (ø)
src/matchers/toBeTrue/index.js	100.00% <0.00%> (ø)
src/matchers/toReject/index.js	100.00% <0.00%> (ø)
src/matchers/toBeAfter/index.js	100.00% <0.00%> (ø)
src/matchers/toBeArray/index.js	100.00% <0.00%> (ø)
... and 78 more

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[SimenB]

I also think it would be nice to warn users about declaration merging not working if you manually import the jest module as the jest docs comment: import { expect } from '@jest/globals.

It fails because jest-extended will merge its type declarations into the types provided by @types/jest. So if you use expect from @jest/globals, the added matchers won't be there.

Agreed, wanna open up a PR @villasv? 🙂