Migrate to immutability pattern

[RDIL]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.47619% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/handleEvent.ts	88.46%	6 Missing ⚠️
src/index.ts	93.75%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/index.ts	96.69% <93.75%> (+0.12%)	⬆️
src/handleEvent.ts	87.19% <88.46%> (+1.13%)	⬆️

... and 21 files with indirect coverage changes

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