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## Summary Implements `--no-env-file` CLI flag and bunfig configuration options to disable automatic `.env` file loading at runtime and in the bundler. ## Motivation Users may want to disable automatic `.env` file loading for: - Production environments where env vars are managed externally - CI/CD pipelines where .env files should be ignored - Testing scenarios where explicit env control is needed - Security contexts where .env files should not be trusted ## Changes ### CLI Flag - Added `--no-env-file` flag that disables loading of default .env files - Still respects explicit `--env-file` arguments for intentional env loading ### Bunfig Configuration Added support for disabling .env loading via `bunfig.toml`: - `env = false` - disables default .env file loading - `env = null` - disables default .env file loading - `env.file = false` - disables default .env file loading - `env.file = null` - disables default .env file loading ### Implementation - Added `disable_default_env_files` field to `api.TransformOptions` with serialization support - Added `disable_default_env_files` field to `options.Env` struct - Implemented `loadEnvConfig` in bunfig parser to handle env configuration - Wired up flag throughout runtime and bundler code paths - Preserved package.json script runner behavior (always skips default .env files) ## Tests Added comprehensive test suite (`test/cli/run/no-envfile.test.ts`) with 9 tests covering: - `--no-env-file` flag with `.env`, `.env.local`, `.env.development.local` - Bunfig configurations: `env = false`, `env.file = false`, `env = true` - `--no-env-file` with `-e` eval flag - `--no-env-file` combined with `--env-file` (explicit files still load) - Production mode behavior All tests pass with debug bun and fail with system bun (as expected). ## Example Usage ```bash # Disable all default .env files bun --no-env-file index.js # Disable defaults but load explicit file bun --no-env-file --env-file .env.production index.js # Disable via bunfig.toml cat > bunfig.toml << 'CONFIG' env = false CONFIG bun index.js ``` ## Files Changed - `src/cli/Arguments.zig` - CLI flag parsing - `src/api/schema.zig` - API schema field with encode/decode - `src/options.zig` - Env struct field and wiring - `src/bunfig.zig` - Config parsing with loadEnvConfig - `src/transpiler.zig` - Runtime wiring - `src/bun.js.zig` - Runtime wiring - `src/cli/exec_command.zig` - Runtime wiring - `src/cli/run_command.zig` - Preserved package.json script runner behavior - `test/cli/run/no-envfile.test.ts` - Comprehensive test suite 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude Bot <claude-bot@bun.sh> Co-authored-by: Claude <noreply@anthropic.com>