/**
 * Seeded body generation — turns a seed + {@link ZoneConstraints} into a
 * deterministic {@link PlanetConfig}.
 *
 * Pure-logic module: no `three` import, no Vue, no DOM. Safe to call from
 * server code, headless workers and the lib's render layer alike.
 *
 * # Determinism contract
 *
 * Every PRNG consumption inside {@link generateBodyConfig} happens in a
 * **frozen sequence** (see `// FROZEN ORDER` block in the implementation).
 * The contract any future contributor must respect:
 *
 *   1. **Append, never insert.** New ranges or feature gates always go at
 *      the end of the sequence. Inserting in the middle changes every
 *      downstream value for every existing seed.
 *   2. **Always consume.** Both range picks and feature-gate rolls draw
 *      from the PRNG even when their result will be discarded (e.g. an
 *      atmosphere range when `features.atmosphere.mode === 'forbidden'`).
 *      This keeps the sequence stable when designers flip a gate's mode
 *      without invalidating the rest of the body.
 *   3. **Namespace by purpose.** This generator seeds its PRNG with
 *      `seed + ':config'`. The shader-side `generateBodyVariation` uses
 *      `seed + ':var'` (`'var:' + config.name` historically). The two
 *      streams are independent — refactoring one cannot shift the other.
 *
 * Breaking any of those rules forces a `genVersion` bump on the consumer
 * side and re-rolls every persisted body.
 */
import type { PlanetConfig } from '../types/body/config.types';
import type { ZoneConstraints } from '../types/generation.types';
/**
 * Generate a deterministic {@link PlanetConfig} from a seed and zone
 * constraints. The same `(seed, constraints)` pair always yields the same
 * config, byte-stable across runtimes (the underlying PRNG is integer-only
 * SplitMix32 with FNV-1a-hashed string seed — no floating-point divergence).
 *
 * Caller-resolved fields are intentionally left undefined on the returned
 * config:
 *
 *   - `liquidColor`, `bandColors`, `metallicBands`, `terrainColorLow/High`
 *     — derived from chemistry / temperature, owned by caller code.
 *   - `liquidState` is set to `'liquid'` or `'none'` only. Promoting to
 *     `'frozen'` requires temperature knowledge the lib does not carry;
 *     the caller downgrades after this call when its thermal model says so.
 *   - `gasMassFraction`, `spectralType` — outside v1 scope.
 *
 * @param seed - Stable string driving every random draw.
 * @param constraints - Generation envelope for the body's zone.
 * @returns A {@link PlanetConfig} with seed-driven physical and visual
 *          envelope filled, caller-resolved fields left undefined.
 */
export declare function generateBodyConfig(seed: string, constraints: ZoneConstraints): PlanetConfig;
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