import type { ColumnCodec, ColumnCodecSpec, GeneralColumnCodec, PreprocessingColumnCodec, RawColumnCodec } from './model-types.js';
export declare function isGeneralCodec(codec: ColumnCodec): codec is GeneralColumnCodec;
export declare function isPreprocessorCodec(codec: ColumnCodec): codec is PreprocessingColumnCodec;
export declare function isRawCodec(codec: ColumnCodec): codec is RawColumnCodec;
export declare function renderCodec(spec: ColumnCodecSpec): string;
/**
 * Parses a ClickHouse-returned codec expression (e.g. `CODEC(Delta(4), ZSTD(1))`).
 * Returns undefined for empty/missing input. Unknown or unparsable tokens fall
 * back to a single `raw` atom holding the whole chain, so ClickHouse-returned
 * codecs we haven't typed still round-trip cleanly.
 */
export declare function parseCodec(raw: string | undefined | null): ColumnCodec[] | undefined;
/**
 * Normalizes a codec spec to array form with ClickHouse defaults filled in,
 * so that `{kind:'ZSTD'}` and `{kind:'ZSTD', level:1}` compare equal.
 * Does not reorder chain steps — `[Delta, ZSTD]` ≠ `[ZSTD, Delta]` semantically.
 */
export declare function canonicalizeCodec(spec: ColumnCodecSpec): ColumnCodec[];
export declare function codecsEqual(a?: ColumnCodecSpec, b?: ColumnCodecSpec): boolean;
export declare const codec: {
    raw: (expression: string) => RawColumnCodec;
};
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