import type { Schema } from 'effect';
/**
 * A derived JSON-Schema fragment in the `validateStructural` / `CommandJsonSchema`
 * dialect. Every field is optional at the fragment level; the TOP-LEVEL result
 * of a `Schema.Struct` is the tighter `JsonSchemaObject` (always `type:'object'`
 * with `properties`).
 *
 * `const`/`enum` carry JSON-primitive literal values (string | number | boolean
 * | null) — the only literal kinds Effect's `Literal` AST and the structural
 * validator both model.
 */
export interface JsonSchemaFragment {
    readonly type?: string | readonly string[];
    readonly properties?: Readonly<Record<string, JsonSchemaFragment>>;
    readonly required?: readonly string[];
    readonly enum?: readonly (string | number | boolean | null)[];
    readonly const?: string | number | boolean | null;
    readonly items?: JsonSchemaFragment;
}
/**
 * The TOP-LEVEL object shape a command descriptor's `inputSchema` /
 * `outputSchema` carries. Structurally a `JsonSchemaFragment` pinned to
 * `type:'object'` — assignable to `@czap/_spine`'s `CommandJsonSchema` (the
 * `properties` values are `unknown` there; here they are typed fragments).
 */
export interface JsonSchemaObject extends JsonSchemaFragment {
    readonly type: 'object';
    readonly properties: Readonly<Record<string, JsonSchemaFragment>>;
    readonly required?: readonly string[];
}
/**
 * Walk a `Schema` AST and derive the JSON-Schema OBJECT a command descriptor's
 * `inputSchema` / `outputSchema` carries. The top-level schema MUST be a
 * `Schema.Struct` (`TypeLiteral`) — a command's I/O contract is always an
 * object — so the result is the tighter `JsonSchemaObject`
 * (`{ type:'object', properties, required? }`). Throws `UnsupportedError` when
 * the root is not an object, or when any nested node has no sound mapping in the
 * structural dialect.
 *
 * Accepts any `Schema.Schema<T>` — only `.ast` is read.
 */
export declare function schemaToJsonSchema<T>(schema: Schema.Schema<T>): JsonSchemaObject;
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