Error Lens

Renders diagnostic messages (errors, warnings, info, hints) directly at the end of code lines using VS Code's inline decoration API, eliminating the need to hover over squiggly underlines. Messages are appended to the line with configurable font styling, margins, and alignment, integrating with VS Code's built-in diagnostic provider system to display messages from any language server protocol (LSP) compliant linter or language server without requiring additional computation.

Provides independent toggle commands for each diagnostic severity level (errors, warnings, info, hints) and a master toggle, allowing developers to filter which diagnostic types are displayed inline. Filtering is managed through VS Code's command palette and persisted in extension settings, enabling workspace-specific diagnostic visibility policies without modifying linter configuration.

Provides a command that sets the editor selection to the exact range of a diagnostic (start and end position), enabling quick navigation to the problematic code segment. Selection behavior is configurable via `selectProblemType` setting, supporting different selection modes (e.g., select word, select line, select range).

Respects VS Code's global `#problems.visibility#` setting (v1.85.0+) to avoid conflicts with upstream UI preferences, allowing developers to manage diagnostic visibility through VS Code's native settings. Synchronization is configurable per visualization layer (inline messages, gutter icons, status bar) via `respectUpstreamEnabled` setting.

Provides 75+ configuration settings for customizing the appearance of inline diagnostic messages, including font family, weight, size, style (italic), margins, and alignment. Styling is applied via VS Code's decoration API, enabling fine-grained control over message appearance without modifying extension code or CSS.

Supports searching multiple linter configuration file types (ESLint, Pylint, etc.) by allowing developers to specify custom file paths via `lintFilePaths` setting. The extension searches specified paths to find linter rules and configurations, enabling support for non-standard linter configurations or multiple linters in a single workspace.

Provides a command (`updateEverything`) to manually refresh all diagnostic decorations in the editor, with configurable update behavior (update or clear). Enables developers to force re-render of inline messages and gutter icons when diagnostics change or when extension state becomes out of sync with language server diagnostics.

Provides a command that automatically inserts linter-specific disable comments (e.g., `// eslint-disable-next-line rule-name`) at the current diagnostic location, with configurable comment format per linter. The extension searches linter configuration files (`.eslintrc.json`, etc.) to determine the correct comment syntax and rule code, then injects the comment without requiring manual lookup.

Provides a command that searches linter configuration files (e.g., `.eslintrc.json`) for the definition of a specific rule code associated with a diagnostic, then displays or opens the rule definition. The search path is configurable via `lintFilePaths` setting, allowing support for multiple linter types and custom configuration locations.

Provides commands to copy diagnostic message text or diagnostic code to clipboard with a single keystroke or command palette invocation. Supports copying the full message string or just the rule code, enabling quick sharing of diagnostic information or pasting into issue trackers without manual selection.

Provides a command to exclude specific diagnostics from display by writing exclusion rules to VS Code settings.json, preventing those diagnostics from appearing inline or in the problems panel. Exclusions are persisted at workspace or user scope and can be manually edited or reverted through settings.

Renders small icons in the editor gutter (left margin) to indicate the presence and severity of diagnostics on each line, providing a visual summary of code quality without inline message text. Gutter icons are configurable and can be toggled independently from inline messages, enabling a minimalist diagnostic visualization mode.

Displays the diagnostic message for the current cursor position in VS Code's status bar (bottom of editor), providing an alternative to inline messages for developers who prefer a centralized information panel. Status bar display is configurable and can be toggled independently from inline messages and gutter icons.

Provides a command to exclude entire workspaces or file paths from diagnostic display, preventing diagnostics from appearing in specified directories or projects. Exclusions are stored in extension settings and can be toggled on/off without removing the exclusion rule, enabling temporary suppression of diagnostics for specific workspace paths.

Provides a command that opens a web browser search for the diagnostic message or rule code, enabling quick lookup of documentation or solutions. The search query format is configurable via `searchForProblemQuery` setting, supporting different search engines or documentation sites (e.g., Stack Overflow, MDN, ESLint docs).