/**
 * Pure descriptor construction from a ProjectionTarget + its meta.
 * Does not import the registry (avoids circular deps).
 */
import type { ProjectionTarget } from './interface.js';
import type { ProjectionDescriptor, ProjectionInvocationRequest, ProjectionInvocationValidation } from './descriptor-types.js';
/** Build a public descriptor from a registered projection target. */
export declare function buildProjectionDescriptor(target: ProjectionTarget): ProjectionDescriptor;
/** Validate a request against an already-built descriptor. */
export declare function validateAgainstDescriptor(descriptor: ProjectionDescriptor, request: ProjectionInvocationRequest): ProjectionInvocationValidation;
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