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Claude-Code

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Claude-Code
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13-build-system

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Build System & Dead Code Elimination

Overview

Claude Code uses Bun for building with a sophisticated dead code elimination (DCE) system. The binary size matters - we need to exclude internal features from external builds.

Plain text
0000_start_here_index_and_recommended_reading_order.md
0100_project_overview_tech_stack_runtime_modes_and_folder_map.md
0200_startup_flow_entry_points_and_cold_start_sequence.md
0300_codebase_modules_layers_state_models_and_schemas.md
0400_system_architecture_and_design_rationale.md
0500_interactive_repl_request_flow_end_to_end.md
0600_headless_sdk_and_print_mode_request_flow_end_to_end.md
0700_mcp_integration_connection_and_tool_call_flow.md
0800_external_services_sdks_storage_and_local_dependencies.md
0900_environment_variables_settings_feature_flags_and_failure_modes.md
1000_non_obvious_patterns_gotchas_and_debugging_traps.md
1100_full_codebase_file_inventory_grouped_by_directory.md
kimi
00-overview.md
01-entrypoints.md
02-state-management.md
03-query-system.md
04-tools-system.md
05-tasks-system.md
06-ui-components.md
07-bridge-remote.md
08-services.md
09-skills-plugins.md
10-commands.md
11-testing-architecture.md
12-permission-system.md
13-build-system.md
14-ink-internals.md
15-git-internals.md
16-context-compaction.md
17-vim-mode.md
18-mailbox-notifications.md
19-session-persistence.md
20-hooks-system.md
21-error-recovery.md
README.md
qwen
00-overview.md
01-entry-points.md
02-query-engine.md
03-tools-and-tasks.md
04-commands-and-skills.md
05-state-management.md
06-ink-rendering.md
07-bridge-remote.md
08-mcp-services.md
09-services-overview.md
10-multi-agent.md
11-system-prompt-constants.md
12-tool-interface.md
13-memory-system.md
14-buddy-companion.md
15-keybindings.md
16-stop-hooks.md
17-vim-mode.md
18-upstreamproxy.md
19-cost-tracking-history.md
20-contexts-styles-onboarding.md
21-hooks.md
22-screens.md
tweets-explain
claude-code-memory-analysis.md
compact
memory-system
agentic-architecture

Core Files

File/DirectoryPurpose
package.jsonDependencies, scripts
tsconfig.jsonTypeScript config
build.tsCustom build script
bun.buildBun bundler config
features.tsFeature flag definitions
macros/Bun macro definitions

Dead Code Elimination (DCE)

The Problem

Claude Code has internal-only features (assistant mode, bridge, daemon). We don't want these in public builds:

TypeScript
The Solution: Build-Time Macros
TypeScript
How feature() Works
TypeScript

Feature Flags

Feature Definition
TypeScript
Conditional Imports
TypeScript

Build Configuration

Build Script
TypeScript
Package Scripts
JSON

Tree Shaking

What Gets Removed
TypeScript
Side-Effect Handling
TypeScript

Macro Examples

Version Macro
TypeScript
Feature Table Macro
TypeScript
Environment Macro
TypeScript

Bundle Analysis

Size Reporting
TypeScript
Visualizing Bundle
Bash

Conditional Compilation

Platform-Specific Code
TypeScript
User Type Conditional
TypeScript

Compilation to Binary

Bash
Compile Options
TypeScript

Development vs Production

TypeScript

Build Performance

Caching
Bash
Parallel Builds
TypeScript

Key Concepts

  1. Build-Time Evaluation: feature(), MACRO.* evaluated at compile, not runtime
  2. Tree Shaking: Unused code automatically removed
  3. Conditional Imports: require() inside if (feature()) vanishes when false
  4. Single Binary: Bun compiles to standalone executable
  5. Platform Optimization: Platform-specific code only includes relevant paths

Debugging Builds

Bash