import { type AstNode } from './flow-step-site.js';
export type IoKind = 'read' | 'write';
/**
 * Classify `call` against the stock I/O registry and the optional consumer
 * `extras` registry, or return `null` if the call is not I/O. `extras` is the
 * `Record` shape `config.trace.io` resolves to — keys are lexical patterns
 * (`"fetch"` or `"cache.get"`), values are `'read' | 'write'`.
 *
 * `call` must be a `CallExpression`; callers walk the AST and hand each one
 * over. This function is pure over the node — no parent lookups, no type
 * resolution. Lexical match only.
 */
export declare function classifyIo(call: AstNode, extras?: Readonly<Record<string, IoKind>>): IoKind | null;
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