import { type EntityClass, EntityMetadata, type EntityName } from '../typings.js';
import type { Configuration } from '../utils/Configuration.js';
import { MetadataStorage } from './MetadataStorage.js';
import { EntitySchema } from './EntitySchema.js';
import type { Platform } from '../platforms/Platform.js';
/** Discovers, validates, and processes entity metadata from configured sources. */
export declare class MetadataDiscovery {
    #private;
    constructor(metadata: MetadataStorage, platform: Platform, config: Configuration);
    /** Discovers all entities asynchronously and returns the populated MetadataStorage. */
    discover(preferTs?: boolean): Promise<MetadataStorage>;
    /** Discovers all entities synchronously and returns the populated MetadataStorage. */
    discoverSync(): MetadataStorage;
    private mapDiscoveredEntities;
    private initAccessors;
    /** Processes discovered entities: initializes relations, embeddables, indexes, and inheritance. */
    processDiscoveredEntities(discovered: EntityMetadata[]): EntityMetadata[];
    private findEntities;
    private discoverMissingTargets;
    private tryDiscoverTargets;
    discoverReferences<T>(refs: Iterable<EntityClass<T> | EntitySchema<T>>, validate?: boolean): EntityMetadata<T>[];
    reset<T>(entityName: EntityName<T>): void;
    private getSchema;
    private getRootEntity;
    private discoverEntity;
    private initNullability;
    private applyNamingStrategy;
    private initOwnColumns;
    private initFieldName;
    private initManyToOneFieldName;
    private initManyToManyFieldName;
    private initManyToManyFields;
    private isExplicitTableName;
    private initManyToOneFields;
    private initOneToManyFields;
    private processEntity;
    private findReferencingProperties;
    private initFactoryField;
    private ensureCorrectFKOrderInPivotEntity;
    private definePivotTableEntity;
    /**
     * Create a scalar property for a pivot table column.
     */
    private createPivotScalarProperty;
    /**
     * Get column types for an entity's primary keys, initializing them if needed.
     */
    private getPrimaryKeyColumnTypes;
    /**
     * Add missing FK columns for a polymorphic entity to an existing pivot table.
     */
    private addPolymorphicPivotColumns;
    /**
     * Define properties for a polymorphic pivot table.
     */
    private definePolymorphicPivotProperties;
    /**
     * Mirror of definePolymorphicPivotProperties for union-target M:N
     * (e.g. Post.attachments -> Image | Video via shared pivot with a target-side discriminator).
     *
     * Pivot shape:
     *   (owner_fk..., discriminator_column, target_fk...)
     *   - owner side is a normal M:1 to the single owner entity
     *   - target side is a discriminator column + per-target-type virtual M:1 relations
     */
    private defineUnionTargetPolymorphicPivotProperties;
    /**
     * Create a virtual M:1 relation from pivot to a polymorphic owner entity.
     * This enables single-query join loading for inverse-side polymorphic M:N.
     */
    private definePolymorphicOwnerRelation;
    private defineFixedOrderProperty;
    private definePivotProperty;
    private autoWireBidirectionalProperties;
    private defineBaseEntityProperties;
    private initPolyEmbeddables;
    private initPolymorphicRelation;
    private initEmbeddables;
    private sameRelationTargetRoot;
    private initSingleTableInheritance;
    /**
     * First pass of TPT initialization: sets up hierarchy relationships
     * (inheritanceType, tptParent, tptChildren) before properties have fieldNames.
     */
    private initTPTRelationships;
    /**
     * Second pass of TPT initialization: re-resolves metadata references after fieldNames
     * are set, syncs to registry metadata, and sets up discriminators.
     */
    private finalizeTPTInheritance;
    /**
     * Initialize TPT discriminator map and virtual discriminator property.
     * Unlike STI where the discriminator is a persisted column, TPT discriminator is computed
     * at query time using CASE WHEN expressions based on which child table has data.
     */
    private initTPTDiscriminator;
    /**
     * Recursively collect all TPT descendants (children, grandchildren, etc.)
     */
    private collectAllTPTDescendants;
    /**
     * Computes ownProps for TPT entities - only properties defined in THIS entity,
     * not inherited from parent. Also creates synthetic join properties for parent/child relationships.
     *
     * Called multiple times during discovery as metadata is progressively built.
     * Each pass overwrites earlier results to reflect the final state of properties.
     */
    private computeTPTOwnProps;
    /** Returns the depth of a TPT entity in its hierarchy (0 for root). */
    private getTPTDepth;
    /**
     * Find the direct TPT parent entity for the given entity.
     */
    private getTPTParent;
    private createDiscriminatorProperty;
    private initAutoincrement;
    private createSchemaTable;
    private initCheckConstraints;
    private initTriggers;
    private initGeneratedColumn;
    private getDefaultVersionValue;
    private inferDefaultValue;
    private initDefaultValue;
    private inferTypeFromDefault;
    private initVersionProperty;
    private initCustomType;
    private initRelation;
    private initColumnType;
    private getMappedType;
    private getPrefix;
    private initUnsigned;
    private initIndexes;
    private shouldForceConstructorUsage;
}