/**
 * BlendTree -- weighted multi-state blending.
 *
 * A blend tree holds named numeric-record values with weights.
 * `compute()` returns the weighted average of all values.
 *
 * @module
 */
import type { Scope } from 'effect';
import { Effect, Stream } from 'effect';
interface BlendNodeShape<T> {
    readonly value: T;
    readonly weight: number;
}
interface BlendTreeShape<T extends Record<string, number>> {
    add(name: string, value: T, weight: number): void;
    remove(name: string): void;
    setWeight(name: string, weight: number): void;
    compute(): T;
    readonly changes: Stream.Stream<T>;
}
/**
 * Creates a new BlendTree for weighted multi-state blending of numeric records.
 * Requires a Scope for lifecycle management of the change stream.
 *
 * @example
 * ```ts
 * const program = Effect.scoped(Effect.gen(function* () {
 *   const tree = yield* BlendTree.make<{ x: number; y: number }>();
 *   tree.add('idle', { x: 0, y: 0 }, 0.3);
 *   tree.add('active', { x: 100, y: 50 }, 0.7);
 *   const blended = tree.compute(); // { x: 70, y: 35 }
 * }));
 * ```
 */
declare function _make<T extends Record<string, number>>(): Effect.Effect<BlendTreeShape<T>, never, Scope.Scope>;
/**
 * BlendTree -- weighted multi-state blending for numeric records.
 * Add named nodes with values and weights, then compute the weighted average.
 *
 * @example
 * ```ts
 * const program = Effect.scoped(Effect.gen(function* () {
 *   const tree = yield* BlendTree.make<{ opacity: number }>();
 *   tree.add('fadeIn', { opacity: 1 }, 0.8);
 *   tree.add('fadeOut', { opacity: 0 }, 0.2);
 *   const result = tree.compute(); // { opacity: 0.8 }
 * }));
 * ```
 */
export declare const BlendTree: {
    make: typeof _make;
};
export declare namespace BlendTree {
    /** Structural shape of a blend-tree instance: `sample(weights)` over a `Record<string, number>` space. */
    type Shape<T extends Record<string, number>> = BlendTreeShape<T>;
    /** Individual leaf/intermediate node in a blend tree. */
    type Node<T> = BlendNodeShape<T>;
}
export {};
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