/**
 * Recognise the deliberately tiny transform shape whose result is already one
 * of a sequence's values: `([, value]) => value`.
 *
 * This is a descriptor extraction, not callback source execution.  Anything
 * with defaults, rest, nesting, a block body, or an expression is left as an
 * ordinary callback.  `fnSrc` is preferred because serialized grammars carry
 * the author's stable source; live combinators fall back to the function's own
 * source only for the same exact syntax.
 */
export declare function directArrayProjection(fn: (...args: never[]) => unknown, fnSrc: string | undefined, arity: number): number | null;
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