/**
 * PostgreSQL COLLATION type builder
 */
export interface CollationDefinition {
    name: string;
    provider: string;
    locale: string;
    deterministic: boolean;
}
/**
 * Registry to store all collation types defined in the schema
 */
export declare class CollationRegistry {
    private static collations;
    static register(def: CollationDefinition): void;
    static get(name: string): CollationDefinition | undefined;
    static getAll(): Map<string, CollationDefinition>;
    static clear(): void;
    static has(name: string): boolean;
}
/**
 * Create a PostgreSQL COLLATION
 *
 * @example
 * const ndCiAi = pgCollation({
 *   name: 'nd_ci_ai',
 *   provider: 'icu',
 *   locale: 'und-u-ks-level1',
 *   deterministic: false,
 * });
 *
 * entity.property(e => e.name).hasType(varchar('name', 200)).hasCollation(ndCiAi);
 */
export declare function pgCollation(config: CollationDefinition): CollationDefinition;
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