Added has(), set(), and assertPathExists()

[webdeveric]

• Added has(), set(), and assertPathExists()
• Added more utility types

[Copilot]

Pull Request Overview

This PR adds three new utility functions (has(), set(), and assertPathExists()) for working with object paths, along with supporting utility types for type-safe path manipulation. The changes enable checking for path existence, setting values at specific paths, and asserting path existence with optional type validation.

Key Changes

• New path manipulation functions: Added has() for checking path existence, set() for setting values at paths, and assertPathExists() for path existence assertions
• Enhanced type system: Added utility types like FromPath, WithPath, Merge, and ParseNumber to support type-safe path operations
• Comprehensive test coverage: Added extensive unit tests and type tests for all new functionality

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/has.ts	Implements has() function with type predicates for path existence checking
src/set.ts	Implements set() function for setting values at object paths with prototype pollution protection
src/assertion/assertPathExists.ts	Implements assertion function for path existence with optional type validation
src/types/objects.ts	Adds utility types FromPath, WithPath, Merge for advanced object path manipulation
src/types/utils.ts	Adds ParseNumber utility type for string-to-number parsing
src/get.ts	Updates parameter type from string to PropertyKey for consistency
test/ files	Comprehensive test coverage for all new functionality

[github-actions]

🎉 This PR is included in version 0.69.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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