Module flags 

Feature flag detection via lightweight Oxc AST visitor.

Detects three patterns:

1. Environment variables: process.env.FEATURE_X
2. SDK calls: useFlag('name'), variation('name', false), flag({ key: 'name' }), etc.
3. Config objects: config.features.x (opt-in, heuristic)

Always extracted during parse (lightweight pattern matching on MemberExpression and CallExpression nodes). Custom SDK patterns and config object heuristics are applied as a supplementary pass in the CLI when user config is present.

Functions

builtin_env_prefixes

Built-in environment variable prefixes treated as feature flags.

builtin_sdk_providers

Distinct built-in SDK provider labels, in declaration order.

extract_flags

Entry point: extract feature flag use sites from a parsed program.

extract_flags_from_source

Extract feature flags from source text with custom configuration.