name: effect-module-boolean description: Guidance for effect/Boolean focused on APIs like isBoolean, or, and and. Load after effect-skill-router when this module is the primary owner.

Effect Module Boolean

Owned scope

• Owns only effect/Boolean.
• Source of truth: packages/effect/src/Boolean.ts.

What it is for

• This module provides utility functions and type class instances for working with the boolean type in TypeScript. It includes functions for basic boolean operations.

API quick reference

• isBoolean
• or
• and
• eqv
• nor
• not
• xor
• nand
• some
• every
• match
• Order
• Boolean
• implies
• ReducerOr
• ReducerAnd
• Equivalence
• Full API list: references/api-reference.md

How to use it

• Use the reference docs to select the smallest API surface that solves your task.
• Validate behavior against existing tests before introducing new usage patterns.

Starter example

import * as Boolean from "effect/Boolean";

const bool = Boolean.Boolean(1);
console.log(bool); // true

const fromString = Boolean.Boolean("false");
console.log(fromString); // true (non-empty string)

const fromZero = Boolean.Boolean(0);
console.log(fromZero); // false

Common pitfalls

• Prefer explicit, typed combinators over ad-hoc casting or unchecked assumptions.

Not covered here

• Adjacent modules in effect/* and effect/unstable/* are out of scope for this owner.

Escalate to

• effect-skill-router for routing and ownership checks.

Reference anchors

• Module source: packages/effect/src/Boolean.ts
• Representative tests: packages/effect/test/Boolean.test.ts
• API details: references/api-reference.md
• Usage notes: references/usage-reference.md
• Ownership mapping: references/owner.md