feat(indexing): support custom file extensions

[marius-kilocode]

Codebase indexing currently uses a fixed built-in extension list, which prevents projects from limiting indexing work to relevant formats or admitting additional text formats.

Add an optional indexing.fileExtensions allowlist. When configured, it replaces the built-in extension set across full scans, file watching, parsing, stale-result filtering, and worktree searches. Values are normalized case-insensitively, custom text formats use fallback chunking, and omitted configuration preserves the existing defaults.

Expose the setting in the CLI, VS Code, and Console configuration surfaces, and document its replacement semantics.

Closes #12299.

[kilo-code-bot]

Code Review Summary

Status: 2 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	2
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/kilo-indexing/src/indexing/search-service.ts	56	Extension filtering applied after the vector store already capped results at maxResults, can under-return results vs the baseline path's expanding-search approach
packages/kilo-indexing/src/indexing/processors/file-watcher.ts	280	Extensionless files (Dockerfile, Makefile, etc.) previously admitted by `

Files Reviewed (incremental: 1 file)

• packages/kilo-vscode/webview-ui/src/i18n/ko.ts - no issues

Only change since the previous review is a line-wrap formatting fix to the Korean translation string for settings.indexing.fileExtensions.description (no content or logic change). The two previously reported issues remain unresolved (files not touched in this update).

Fix these issues in Kilo Cloud

Previous Review Summaries (2 snapshots, latest commit ca19c85)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit ca19c85)

Status: 2 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	2
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/kilo-indexing/src/indexing/search-service.ts	56	Extension filtering applied after the vector store already capped results at maxResults, can under-return results vs the baseline path's expanding-search approach
packages/kilo-indexing/src/indexing/processors/file-watcher.ts	280	Extensionless files (Dockerfile, Makefile, etc.) previously admitted by `

Files Reviewed (incremental: 19 i18n files)

• packages/kilo-vscode/webview-ui/src/i18n/ar.ts
• packages/kilo-vscode/webview-ui/src/i18n/br.ts
• packages/kilo-vscode/webview-ui/src/i18n/bs.ts
• packages/kilo-vscode/webview-ui/src/i18n/da.ts
• packages/kilo-vscode/webview-ui/src/i18n/de.ts
• packages/kilo-vscode/webview-ui/src/i18n/es.ts
• packages/kilo-vscode/webview-ui/src/i18n/fr.ts
• packages/kilo-vscode/webview-ui/src/i18n/it.ts
• packages/kilo-vscode/webview-ui/src/i18n/ja.ts
• packages/kilo-vscode/webview-ui/src/i18n/ko.ts
• packages/kilo-vscode/webview-ui/src/i18n/nl.ts
• packages/kilo-vscode/webview-ui/src/i18n/no.ts
• packages/kilo-vscode/webview-ui/src/i18n/pl.ts
• packages/kilo-vscode/webview-ui/src/i18n/ru.ts
• packages/kilo-vscode/webview-ui/src/i18n/th.ts
• packages/kilo-vscode/webview-ui/src/i18n/tr.ts
• packages/kilo-vscode/webview-ui/src/i18n/uk.ts
• packages/kilo-vscode/webview-ui/src/i18n/zh.ts
• packages/kilo-vscode/webview-ui/src/i18n/zht.ts

Only additive translation strings for the new settings.indexing.fileExtensions.* keys; no logic changes since the previous review. The two previously reported issues remain unresolved (files not touched in this update).

Fix these issues in Kilo Cloud

Previous review (commit c081f58)

Status: 2 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	2
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/kilo-indexing/src/indexing/search-service.ts	56	Extension filtering applied after the vector store already capped results at maxResults, can under-return results vs the baseline path's expanding-search approach
packages/kilo-indexing/src/indexing/processors/file-watcher.ts	280	Extensionless files (Dockerfile, Makefile, etc.) previously admitted by `

Files Reviewed (32 files)

• .changeset/indexing-file-extensions.md
• bun.lock
• packages/kilo-console/package.json
• packages/kilo-console/src/routes/config/IndexingRoute.tsx
• packages/kilo-console/src/routes/config/state/indexing.test.ts
• packages/kilo-console/src/routes/config/state/indexing.ts
• packages/kilo-docs/pages/customize/context/codebase-indexing.md
• packages/kilo-indexing/package.json
• packages/kilo-indexing/src/config.ts
• packages/kilo-indexing/src/file-extensions.ts
• packages/kilo-indexing/src/indexing/config-manager.ts
• packages/kilo-indexing/src/indexing/interfaces/config.ts
• packages/kilo-indexing/src/indexing/processors/file-watcher.ts - 1 issue
• packages/kilo-indexing/src/indexing/processors/parser.ts
• packages/kilo-indexing/src/indexing/processors/scanner.ts
• packages/kilo-indexing/src/indexing/search-service.ts - 1 issue
• packages/kilo-indexing/src/indexing/service-factory.ts
• packages/kilo-indexing/src/indexing/shared/is-binary.ts
• packages/kilo-indexing/src/indexing/shared/supported-extensions.ts
• packages/kilo-indexing/test/kilocode/indexing/config-manager.test.ts
• packages/kilo-indexing/test/kilocode/indexing/processors/file-watcher.test.ts
• packages/kilo-indexing/test/kilocode/indexing/processors/parser.test.ts
• packages/kilo-indexing/test/kilocode/indexing/processors/scanner.test.ts
• packages/kilo-indexing/test/kilocode/indexing/search-service.test.ts
• packages/kilo-vscode/tests/unit/indexing-tab-state.test.ts
• packages/kilo-vscode/webview-ui/src/components/settings/IndexingTab.tsx
• packages/kilo-vscode/webview-ui/src/i18n/en.ts
• packages/kilo-vscode/webview-ui/src/types/messages/config.ts
• packages/opencode/src/kilocode/components/dialog-indexing.tsx
• packages/opencode/src/kilocode/config/overlay.ts
• packages/opencode/test/kilocode/indexing-dialog-state.test.ts
• packages/opencode/test/kilocode/server/config-overlay.test.ts
• packages/sdk/js/src/v2/gen/types.gen.ts
• packages/sdk/openapi.json

Fix these issues in Kilo Cloud

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_{Reviewed by claude-sonnet-5 · Input: 34 · Output: 5.4K · Cached: 745.3K}

_{Review guidance: REVIEW.md from base branch main}