import type { FitInput, FitResult } from './types.js';
/**
 * Combine a hole and a shaft tolerance class into an ISO 286 fit.
 *
 * ISO 286 is used in practice as a pair, not as a single tolerance zone: a drawing
 * carries `Ø30 H7/g6`, and what the designer needs from it is the clearance or
 * interference the pair produces. Computing one zone at a time leaves that final
 * subtraction to the caller, which is where sign errors live.
 *
 * This is a composition of two `tolerance()` calls plus the two extreme-condition
 * subtractions; it introduces no new table data.
 *
 * Clearance is measured in micrometres and is positive when the hole is larger than
 * the shaft. A negative value is an interference — the parts must be pressed or
 * shrunk together — so a single signed quantity covers both cases and there is no
 * separate "interference" field to keep in sync.
 *
 * The classification follows ISO 286-1 directly and invents no threshold:
 * a fit is a clearance fit when even the tightest pairing leaves a gap, an
 * interference fit when even the loosest pairing overlaps, and a transition fit
 * when the outcome depends on where each part falls inside its own tolerance zone.
 *
 * @throws RangeError if the nominal size is out of range, an IT grade is unknown,
 *   or a deviation letter is unknown (propagated from `tolerance()`)
 */
export declare function fit(input: FitInput): FitResult;
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