Entry Points & CLI Bootstrap

import { feature } from 'bun:bundle';

// Bugfix for corepack auto-pinning, which adds yarnpkg to peoples' package.jsons

// eslint-disable-next-line custom-rules/no-top-level-side-effects

process.env.COREPACK_ENABLE_AUTO_PIN = '0';

// Set max heap size for child processes in CCR environments (containers have 16GB)

// eslint-disable-next-line custom-rules/no-top-level-side-effects, custom-rules/no-process-env-top-level, custom-rules/safe-env-boolean-check

if (process.env.CLAUDE_CODE_REMOTE === 'true') {

  // eslint-disable-next-line custom-rules/no-top-level-side-effects, custom-rules/no-process-env-top-level

  const existing = process.env.NODE_OPTIONS || '';

  // eslint-disable-next-line custom-rules/no-top-level-side-effects, custom-rules/no-process-env-top-level

  process.env.NODE_OPTIONS = existing ? `${existing} --max-old-space-size=8192` : '--max-old-space-size=8192';

}

// Harness-science L0 ablation baseline. Inlined here (not init.ts) because

// BashTool/AgentTool/PowerShellTool capture DISABLE_BACKGROUND_TASKS into

// module-level consts at import time — init() runs too late. feature() gate

// DCEs this entire block from external builds.

// eslint-disable-next-line custom-rules/no-top-level-side-effects, custom-rules/no-process-env-top-level

if (feature('ABLATION_BASELINE') && process.env.CLAUDE_CODE_ABLATION_BASELINE) {

  for (const k of ['CLAUDE_CODE_SIMPLE', 'CLAUDE_CODE_DISABLE_THINKING', 'DISABLE_INTERLEAVED_THINKING', 'DISABLE_COMPACT', 'DISABLE_AUTO_COMPACT', 'CLAUDE_CODE_DISABLE_AUTO_MEMORY', 'CLAUDE_CODE_DISABLE_BACKGROUND_TASKS']) {

    // eslint-disable-next-line custom-rules/no-top-level-side-effects, custom-rules/no-process-env-top-level

    process.env[k] ??= '1';

  }

}

/**

 * Bootstrap entrypoint - checks for special flags before loading the full CLI.

 * All imports are dynamic to minimize module evaluation for fast paths.

 * Fast-path for --version has zero imports beyond this file.

 */

async function main(): Promise<void> {

  const args = process.argv.slice(2);

  // Fast-path for --version/-v: zero module loading needed

  if (args.length === 1 && (args[0] === '--version' || args[0] === '-v' || args[0] === '-V')) {

    // MACRO.VERSION is inlined at build time

    // biome-ignore lint/suspicious/noConsole:: intentional console output

    console.log(`${MACRO.VERSION} (Claude Code)`);

    return;

  }

  // For all other paths, load the startup profiler

  const {

    profileCheckpoint

  } = await import('../utils/startupProfiler.js');

  profileCheckpoint('cli_entry');

  // Fast-path for --dump-system-prompt: output the rendered system prompt and exit.

  // Used by prompt sensitivity evals to extract the system prompt at a specific commit.

  // Ant-only: eliminated from external builds via feature flag.

  if (feature('DUMP_SYSTEM_PROMPT') && args[0] === '--dump-system-prompt') {

    profileCheckpoint('cli_dump_system_prompt_path');

    const {

      enableConfigs

    } = await import('../utils/config.js');

    enableConfigs();

    const {

      getMainLoopModel

    } = await import('../utils/model/model.js');

    const modelIdx = args.indexOf('--model');

    const model = modelIdx !== -1 && args[modelIdx + 1] || getMainLoopModel();

    const {

      getSystemPrompt

    } = await import('../constants/prompts.js');

    const prompt = await getSystemPrompt([], model);

    // biome-ignore lint/suspicious/noConsole:: intentional console output

    console.log(prompt.join('\n'));

    return;