import type { FsCondition } from './types.ts';
/**
 * Name the condition an error reports, if the vocabulary names one.
 *
 * The one classifier: every boundary (the fuse-native adapter, the
 * quickjs wasi shim, the monty encoders, pyodide's errno lookup) calls
 * this and then renders the condition through its own number table.
 * Keys on the stamped `code` (python's twin keys on exception class),
 * plus the registry's unstamped no-mount refusal, which is a miss.
 * Null means "no named condition" and the caller keeps its own
 * fallback, because a code outside the vocabulary is a passthrough,
 * not a translation.
 */
export declare function classify(err: unknown): FsCondition | null;
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