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Merged
Sander-Toonen merged 5 commits into from
Dec 29, 2025
Merged

Code review: centralize types, add caching, improve documentation #4

Sander-Toonen merged 5 commits into from
Dec 29, 2025

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Copilot AI commented Dec 29, 2025 •
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  • Explore repository structure and understand codebase architecture
  • Run existing tests (934 tests passing)
  • Run lint checks (passing)
  • Document code review findings
  • Implement improvements for understandability
  • Implement improvements for performance
  • Implement improvements for decoupling
  • Implement improvements for consistency
  • Address code review feedback
  • Refactor token-stream.ts to reduce cognitive complexity
    • Extract isOperator() into smaller helper methods:
      • tryMatchSingleCharOperator() - handles +, -, *, /, %, ^, :, .
      • tryMatchMultiplicationSymbol() - handles unicode multiplication symbols
      • tryMatchQuestionOperator() - handles ? and ??
      • tryMatchComparisonOperator() - handles >=, <=, ==, !=
      • tryMatchPipeOperator() - handles | and ||
      • tryMatchAmpersandOperator() - handles &&
      • tryMatchAsOperator() - handles 'as' keyword
    • Extract processEscapeChar() from unescape()
    • Use lookup tables (Set/Record) for operators and escape sequences
  • Run tests to validate changes (934 tests passing)
  • Run final code review
Original prompt

Do a code review of this code base. Suggests points where the code can be made more understandable, performant, decoupled and consistent.

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

Copilot AI and others added 3 commits December 29, 2025 14:05
@Sander-Toonen
Initial exploration of codebase for code review
4a067a7 
Co-authored-by: Sander-Toonen <5106372+Sander-Toonen@users.noreply.github.com>
@Sander-Toonen
Code review improvements: centralize types, add caching, improve docu…
216f828 
…mentation

Co-authored-by: Sander-Toonen <5106372+Sander-Toonen@users.noreply.github.com>
@Sander-Toonen
Address code review feedback and restore yarn.lock
0839571 
Co-authored-by: Sander-Toonen <5106372+Sander-Toonen@users.noreply.github.com>
Copilot AI changed the title [WIP] Review code base for understandability and performance improvements Code review: centralize types, add caching, improve documentation Dec 29, 2025
Copilot AI requested a review from Sander-Toonen December 29, 2025 14:16
@Sander-Toonen
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Sander-Toonen commented Dec 29, 2025

@copilot Focus on token-stream.ts. This file is way too complex. Reduce cognitive complexity by refactoring. Do not change any functionality.

@Sander-Toonen
Refactor token-stream.ts to reduce cognitive complexity
09f7ed6 
Co-authored-by: Sander-Toonen <5106372+Sander-Toonen@users.noreply.github.com>
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Copilot AI commented Dec 29, 2025

@copilot Focus on token-stream.ts. This file is way too complex. Reduce cognitive complexity by refactoring. Do not change any functionality.

Refactored token-stream.ts in commit 09f7ed6 to reduce cognitive complexity:

  1. Extracted isOperator() into 7 smaller helper methods:

    • tryMatchSingleCharOperator() - handles +, -, *, /, %, ^, :, .
    • tryMatchMultiplicationSymbol() - handles unicode symbols
    • tryMatchQuestionOperator() - handles ? and ??
    • tryMatchComparisonOperator() - handles >=, <=, ==, !=
    • tryMatchPipeOperator() - handles | and ||
    • tryMatchAmpersandOperator() - handles &&
    • tryMatchAsOperator() - handles 'as' keyword

  2. Extracted processEscapeChar() from the large switch statement in unescape()

  3. Added lookup tables (Set and Record) for operators and escape sequences

Functionality is unchanged - all 934 tests pass.

@Sander-Toonen Sander-Toonen marked this pull request as ready for review December 29, 2025 14:37
@Sander-Toonen Sander-Toonen merged commit 213f2df into master Dec 29, 2025
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