import type ts from "typescript";
/**
 * Read `checker.getApparentType` when the host TypeScript version provides it.
 *
 * @param checker - TypeScript type checker.
 * @param type - Candidate type.
 *
 * @returns Apparent type when available; otherwise `undefined`.
 */
export declare const getTypeCheckerApparentType: (checker: Readonly<ts.TypeChecker>, type: Readonly<ts.Type>) => ts.Type | undefined;
/**
 * Read `checker.getBaseTypes` when the host TypeScript version provides it.
 *
 * @param checker - TypeScript type checker.
 * @param type - Candidate type.
 *
 * @returns Base types when available; otherwise `undefined`.
 */
export declare const getTypeCheckerBaseTypes: (checker: Readonly<ts.TypeChecker>, type: Readonly<ts.Type>) => readonly ts.BaseType[] | undefined;
/**
 * Read `checker.getStringType` when the host TypeScript version provides it.
 *
 * @param checker - TypeScript type checker.
 *
 * @returns Primitive string type when available; otherwise `undefined`.
 */
export declare const getTypeCheckerStringType: (checker: Readonly<ts.TypeChecker>) => ts.Type | undefined;
/**
 * Read `checker.isTypeAssignableTo` when the host TypeScript version provides
 * it.
 *
 * @param checker - TypeScript type checker.
 * @param source - Candidate source type.
 * @param target - Candidate target type.
 *
 * @returns Assignability result when available; otherwise `undefined`.
 */
export declare const getTypeCheckerIsTypeAssignableToResult: (checker: Readonly<ts.TypeChecker>, source: Readonly<ts.Type>, target: Readonly<ts.Type>) => boolean | undefined;
/**
 * Read `checker.getBaseConstraintOfType` when the host TypeScript version
 * provides it.
 *
 * @param checker - TypeScript type checker.
 * @param type - Candidate type.
 *
 * @returns Base-constraint type when available; otherwise `undefined`.
 */
export declare const getTypeCheckerBaseConstraintType: (checker: Readonly<ts.TypeChecker>, type: Readonly<ts.Type>) => ts.Type | undefined;
/**
 * Read `checker.isArrayType` when the host TypeScript version provides it.
 *
 * @param checker - TypeScript type checker.
 * @param type - Candidate type.
 *
 * @returns Array-type result when available; otherwise `undefined`.
 */
export declare const getTypeCheckerIsArrayTypeResult: (checker: Readonly<ts.TypeChecker>, type: Readonly<ts.Type>) => boolean | undefined;
/**
 * Read `checker.isTupleType` when the host TypeScript version provides it.
 *
 * @param checker - TypeScript type checker.
 * @param type - Candidate type.
 *
 * @returns Tuple-type result when available; otherwise `undefined`.
 */
export declare const getTypeCheckerIsTupleTypeResult: (checker: Readonly<ts.TypeChecker>, type: Readonly<ts.Type>) => boolean | undefined;
/**
 * Read `checker.getTypeArguments` when the host TypeScript version provides it.
 *
 * @param checker - TypeScript type checker.
 * @param type - Candidate type.
 *
 * @returns Type arguments when available; otherwise `undefined`.
 */
export declare const getTypeCheckerTypeArguments: (checker: Readonly<ts.TypeChecker>, type: Readonly<ts.Type>) => readonly ts.Type[] | undefined;
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