feat: Release v2.0.0 - Major React 18 upgrade and modernization

[eggman64]

BREAKING CHANGES:

• Drop React 16 support, now requires React 17+
• Migrate from yarn to npm package manager
• Update minimum Node.js requirements

✨ New Features:

• Add React 18 full compatibility
• Add comprehensive test coverage (94% statement coverage)
• Add ESLint with modern flat configuration
• Add Cypress code coverage integration
• Add new test files for complete API coverage

🔧 Improvements:

• Update all dependencies to latest secure versions
• Modernize build toolchain (Webpack 5, TypeScript 5, Cypress 15)
• Enhanced error handling and edge case coverage in tests
• Streamlined npm-only development workflow
• Updated GitHub Actions with modern authentication
• Added comprehensive lint rules for code quality

🛠 Technical Updates:

• TypeScript 5.0.0 with ES2018 target
• Webpack 5.102.1 with modern configuration
• Cypress 15.4.0 with component testing
• ESLint 9.x with flat configuration format
• @cypress/code-coverage with nyc reporting

📦 Dependencies:

• React peer dependencies: '^17.0.0 || ^18.0.0'
• Remove all yarn configuration and files
• Update all devDependencies to latest stable versions
• Add babel-plugin-istanbul for test instrumentation

🔒 Security:

• Resolve vulnerabilities in outdated dependencies
• Update to secure versions of all development tools

[Copilot]

Pull Request Overview

This PR implements a major version 2.0.0 release that modernizes the React Laika client with React 18 support and comprehensive testing improvements. The upgrade includes breaking changes by dropping React 16 support and migrating from yarn to npm.

Key changes:

• Updated React peer dependencies to support React 17+ and React 18
• Added comprehensive test coverage with new test files and enhanced error handling tests
• Modernized development toolchain with updated dependencies (TypeScript 5, Webpack 5, Cypress 15, ESLint 9)

Reviewed Changes

Copilot reviewed 20 out of 22 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
package.json	Updated version to 2.0.0, migrated to npm, updated React peer deps and all dev dependencies
src/utils.ts	Improved type safety by replacing any with unknown and fixing unreachable code
src/utils.test.ts	Added comprehensive error handling tests for network failures and corrupted data
src/index.test.ts	New test file for verifying main exports
src/hook.test.tsx	Added error handling test for uninitialized hook usage
webpack.config.js	New webpack configuration with TypeScript and coverage support
eslint.config.js	New ESLint flat configuration with TypeScript and React rules
cypress.config.ts	New Cypress configuration for component testing with coverage
.nycrc.json	Coverage configuration with 90% statement coverage requirement

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[Copilot]

The type guard function should handle null explicitly since typeof null === 'object' in JavaScript. Consider changing the condition to if (!data || typeof data !== 'object' || data === null) to be more explicit about null handling.

[Copilot]

The test script uses the deprecated --component flag. In Cypress 15.4.0, component testing should be configured via the cypress.config.ts file and run with just cypress run when component testing is the default or specify the config explicitly.

Suggested change

	"test": "cypress run --component",
	"test:coverage": "cypress run --component && nyc report --reporter=text --reporter=lcov",
	"test": "cypress run",
	"test:coverage": "cypress run && nyc report --reporter=text --reporter=lcov",

[codecov]

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