import { type SQL, type AnyColumn } from "drizzle-orm";
/**
 * TiDB / MySQL cast expressions for Drizzle `sql` fragments.
 * @see https://docs.pingcap.com/tidb/stable/cast-functions-and-operators
 *
 * `asType` / `type` / `charset` fragments are embedded with `sql.raw()` and must be trusted
 * (build them with `castTarget*` helpers or fixed literals — never concatenate user input).
 */
export type CastSqlInput = SQL | AnyColumn | string | number | boolean;
/** `CAST(expr AS type)` — `asType` is a full MySQL cast target, e.g. `castTargetChar(10)`. */
export declare function sqlCast(expr: CastSqlInput, asType: string): SQL;
/**
 * `CONVERT(expr, type)` — same cast targets as `CAST(... AS type)`.
 * Prefer `sqlCast` unless you need `CONVERT` syntax.
 */
export declare function sqlConvert(expr: CastSqlInput, type: string): SQL;
/** `CONVERT(expr USING charset)` — character set conversion (e.g. `utf8mb4`). */
export declare function sqlConvertUsing(expr: CastSqlInput, charset: string): SQL;
/**
 * `BINARY expr` (deprecated since MySQL 8.0.27; prefer `sqlCast(expr, castTargetBinary())`).
 */
export declare function sqlBinary(expr: CastSqlInput): SQL;
/** `BINARY` or `BINARY(n)` */
export declare function castTargetBinary(length?: number): string;
/** `CHAR` or `CHAR(n)` */
export declare function castTargetChar(length?: number): string;
/** `DATE` */
export declare function castTargetDate(): string;
/** `DATETIME` or `DATETIME(fsp)` */
export declare function castTargetDateTime(fsp?: number): string;
/** `DECIMAL`, `DECIMAL(n)`, or `DECIMAL(n, m)` */
export declare function castTargetDecimal(precision?: number, scale?: number): string;
/** `DOUBLE` */
export declare function castTargetDouble(): string;
/** `FLOAT` or `FLOAT(n)` */
export declare function castTargetFloat(bits?: number): string;
/** `JSON` */
export declare function castTargetJson(): string;
/** `REAL` */
export declare function castTargetReal(): string;
/** `SIGNED` */
export declare function castTargetSigned(): string;
/** `SIGNED INTEGER` */
export declare function castTargetSignedInteger(): string;
/** `UNSIGNED` */
export declare function castTargetUnsigned(): string;
/** `UNSIGNED INTEGER` */
export declare function castTargetUnsignedInteger(): string;
/** `TIME` or `TIME(fsp)` */
export declare function castTargetTime(fsp?: number): string;
/** `VECTOR` (TiDB) */
export declare function castTargetVector(): string;
/** `YEAR` */
export declare function castTargetYear(): string;
/**
 * Multi-valued index form: `UNSIGNED ARRAY`, `CHAR(10) ARRAY`, etc.
 * @param elementTarget — e.g. `castTargetUnsigned()` or `castTargetChar(64)`
 */
export declare function castTargetArray(elementTarget: string): string;
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