Enhance Config Loading and Merging Logic with Parallel Checks

[Mefisto04]

This pull request introduces several enhancements to the configuration loading and merging logic in the Repopack codebase:

• Parallel File Checks: Implemented parallel execution of local and global configuration file existence checks using Promise.all() to reduce execution time.
• Refactored Error Handling: Consolidated error handling in the loadAndValidateConfig function to improve code clarity and maintainability.
• Simplified Merging Logic: Introduced helper functions in the mergeConfigs function to streamline the merging process and avoid repetitive code.

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📝 Walkthrough

Walkthrough

The changes in this pull request primarily focus on enhancing the loadFileConfig function in src/config/configLoad.ts. The modifications simplify the logic for loading configuration files by using the nullish coalescing operator and refactor error handling to utilize Promise.all for concurrent file existence checks. New helper functions are introduced to improve code readability and maintainability, while the merging process for configurations is clarified through distinct functions. Overall, the changes aim to streamline the code structure while preserving its original functionality.

Changes

File Path	Change Summary
src/config/configLoad.ts	- Modified loadFileConfig to simplify config path logic using nullish coalescing operator.
	- Refactored error handling to check file existence using Promise.all.
	- Introduced checkFileExists and handleError helper functions for better readability.
	- Updated merging logic in mergeConfigs to use mergeOutput and mergeIgnore functions.

Possibly related issues

• Streamline Logic and Error Handling in configLoad.ts #132: This issue suggests optimizing the code in src/config/configLoad.ts by parallelizing file checks and enhancing error handling, which aligns with the changes made in this PR.

Possibly related PRs

• fix: Allow markdown as valid option in configuration #126: This PR modifies the validateConfig function to include 'markdown' as a valid option for the output.style, which is relevant to the configuration handling improvements in the main PR.

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