Implement enhanced CLI error formatting #62130
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- Add visual bullet points (●) for each diagnostic - Move error codes (TS####) to the right and de-emphasize with grey - Replace tilde (~) underlines with overlines (▔) - Add vertical bars (|) for better code snippet framing - Terminal width detection with 60+ column requirement - Fallback to original formatting for narrow terminals - Full backwards compatibility maintained
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Pull Request Overview
This PR implements enhanced CLI error formatting for TypeScript compiler diagnostics to improve readability and visual structure. The changes introduce a more modern error display format with visual markers, cleaner code presentation, and improved terminal compatibility detection.
Key Changes
- Replaces traditional tilde underlines with overlines and adds visual bullet points for error markers
- Implements terminal width detection to determine when to use enhanced formatting (minimum 60 columns)
- Maintains full backwards compatibility by falling back to original formatting for narrow terminals
- Fix length parameter with proper default value handling - Add proper bounds checking for overline calculation - Simplify terminal detection with explicit checks for limited terminals - Handle multi-line errors gracefully by showing only first line - Add CI environment detection with opt-in support - Respect NO_COLOR environment variable
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- Fix trailing commas in function parameters - Fix quote consistency (single quotes to double quotes) - Fix empty line spacing according to dprint style guide
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🤖 AI Assistant: Task completed: PR #62130: Implement enhanced CLI error formatting |
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Fixes #45717
Summary
This PR implements the enhanced error formatting proposed in #45717, improving the readability and visual structure of TypeScript compiler error messages.
Changes
Before:
After:
Implementation Details
Testing
Notes