/** A predicate over a single column value. */
export type Matcher = (value: unknown) => boolean;
/**
 * Loose equality across engine value representations: when both sides are
 * numeric ("6.50" vs 6.5) compare as numbers, else as strings. A non-numeric
 * string never coerces, so blank/whitespace cells don't spuriously match 0.
 */
export declare function looseEquals(a: unknown, b: unknown): boolean;
/** Loose-equality (numeric-aware String compare). */
export declare function eq(expected: unknown): Matcher;
/** Loose-inequality. */
export declare function ne(expected: unknown): Matcher;
export declare function lt(bound: number): Matcher;
export declare function lte(bound: number): Matcher;
export declare function gt(bound: number): Matcher;
export declare function gte(bound: number): Matcher;
export declare function between(min: number, max: number): Matcher;
export declare function oneOf(values: unknown[]): Matcher;
/** SQL-style LIKE: % = any run, _ = one char. Anchored, case-insensitive. */
export declare function like(pattern: string): Matcher;
export declare function contains(substr: string): Matcher;
export declare function startsWith(prefix: string): Matcher;
export declare function endsWith(suffix: string): Matcher;
export declare function matches(re: RegExp): Matcher;
export declare function isNull(): Matcher;
export declare function notNull(): Matcher;
export declare function not(matcher: Matcher): Matcher;