Guide

@featureflare/core

Core evaluation and type system internals.

Current section

Product and workflow docs

Use these pages when you are wiring projects, operating flags, and reviewing rollout behavior.

Internal evaluation engine and shared types package for rule execution, context matching, percentage bucketing, and rollout schedule handling.

More on this: this package underpins behavior surfaced by @featureflare/sdk-js.

What it provides

Canonical flag, rule, condition, and evaluation context types.
Rule operators for allow/deny, attribute conditions, schedule windows, and percentage rollout.
Stable bucketing helpers and ramp-plan active step resolution.
Evaluation detail output with matched rule metadata and reason classification.