/** Element-count threshold above which the WASM kernel beats JS. */
export declare const WASM_ELEMENTWISE_THRESHOLD = 1024;
/**
 * Unary ops with an `array_<op>_ptr` kernel that is benchmark-confirmed
 * net-faster than JS (see tools/benchmark/wasm/{elementwise,transcendental}.bench.mjs).
 * Excluded after measuring (JS wins): sqrt, cbrt, asin, acos, cosh, asinh, acosh.
 */
export declare const WASM_ELEMENTWISE_OPS: readonly ['abs', 'sin', 'cos', 'tan', 'exp', 'log', 'atan', 'sinh', 'tanh', 'atanh', 'expm1', 'log1p', 'log2', 'log10', 'sec', 'csc', 'cot', 'erfc'];
/** Name of an element-wise operation that has a WebAssembly kernel. */
export type WasmElementwiseOp = (typeof WASM_ELEMENTWISE_OPS)[number];
/**
 * Apply a unary elementwise op over `xs` via the AS `array_<op>_ptr` kernel.
 * Returns the result, or `null` (below threshold, wasm unavailable, kernel
 * missing, or any failure) — in which case the caller uses its JS/parallel path.
 * Never throws.
 */
export declare function elementwiseUnaryDispatch(op: WasmElementwiseOp, xs: Float64Array): Float64Array | null;
/**
 * Op-fusion (Tier 3): apply a *chain* of unary ops with the data resident in
 * wasm memory the whole time — one copy-in, one copy-out, regardless of chain
 * length. `fuseUnaryChain([sin, exp])` computes `exp(sin(x))` paying the JS↔wasm
 * transfer once instead of once per op. Returns null (caller applies the chain
 * in JS) below threshold, when wasm is unavailable, or any kernel is missing.
 * Never throws.
 */
export declare function elementwiseChainDispatch(ops: WasmElementwiseOp[], xs: Float64Array): Float64Array | null;
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