/**
 * PLAIN encoding — the simplest Parquet value layout: values written back to
 * back, little-endian, with no compression or dictionary. Correct and portable;
 * denser encodings can be added later without changing what readers accept.
 * Spec: docs/specs/2026-07-19-typed-output-and-parquet-writer.md §6.
 */
export declare function plainInt32(values: readonly number[]): Uint8Array;
export declare function plainInt64(values: readonly bigint[]): Uint8Array;
export declare function plainDouble(values: readonly number[]): Uint8Array;
/** Each value is a 4-byte little-endian byte length followed by its bytes. */
export declare function plainByteArray(values: readonly string[]): Uint8Array;
/** Fixed-width values (e.g. a 16-byte UUID) carry no length prefix. */
export declare function plainFixed(values: readonly Uint8Array[]): Uint8Array;
/** Booleans are bit-packed, least-significant bit first. */
export declare function plainBoolean(values: readonly boolean[]): Uint8Array;
/** PLAIN FLOAT: 4-byte little-endian IEEE-754 single precision. */
export declare function plainFloat(values: readonly number[]): Uint8Array;
/**
 * IEEE-754 half precision (binary16) as two little-endian bytes.
 *
 * Parquet stores FLOAT16 in a FIXED_LEN_BYTE_ARRAY(2); there is no native
 * physical type for it, so the bits are assembled by hand. Rounding is
 * round-half-to-even, matching what every other implementation does — a
 * different rounding rule would put different bytes in the file for the same
 * input, which is exactly what the cross-language contract forbids.
 */
export declare function halfBits(value: number): number;
/** Decode half-precision bits back to a number. */
export declare function halfToNumber(bits: number): number;
export declare function plainFloat16(values: readonly number[]): Uint8Array;
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