/**
 * [WHO]: REGISTRY (internal, ordered), BuiltinExtension, builtInExtensions, getBuiltinExtensionPaths()
 * [FROM]: Depends on node:fs, node:path, process.env, node:module
 * [TO]: Consumed by main.ts, core/runtime/sdk.ts, test files
 * [HERE]: builtin-extensions.ts - the single ordered built-in extension registry for Catui
 *
 * One ordered list drives both the public metadata projection and the load path resolution, so
 * `defaultEnabled` is the loading decision rather than a second, independent declaration.
 */
export type BuiltinExtensionRiskLevel = "passive" | "command" | "tool" | "background" | "write-capable";
export type BuiltinExtensionTestContract = "lifecycle" | "external-process" | "resource-discovery" | "write-guard";
/** Public metadata projection. Load location is internal; see {@link BuiltinRegistration}. */
export interface BuiltinExtension {
    id: string;
    category: "default" | "optional" | "package";
    defaultEnabled: boolean;
    riskLevel: BuiltinExtensionRiskLevel;
    requiresUI: boolean;
    startsTimers: boolean;
    writesWorkspace: boolean;
    externalProcess: boolean;
    resourceDiscovery?: boolean;
    testContracts?: readonly BuiltinExtensionTestContract[];
    testFiles?: readonly string[];
}
/** Public metadata view. Same order as {@link REGISTRY}, minus internal load fields. */
export declare const builtInExtensions: readonly BuiltinExtension[];
/**
 * Resolve the default-loaded built-in extensions from {@link REGISTRY}, in registry order.
 *
 * An entry loads when `defaultEnabled` is true, or when its activation switch is on. That is the
 * only loading rule: there is no second list that can disagree with the metadata.
 *
 * Default-loaded from `extensions/builtin/`: the discipline, tool and passive skills
 * (typesafe, discipline, skill-tool, catpaw, humanizer, catail), memory (nanomem),
 * internet access (link-world), MCP, security-audit, and the interactive surfaces
 * (presence, idle-think, ask-user-question).
 *
 * Opt-in, enabled via configuration or `--extension`:
 * - Simplify (code simplification) - extensions/optional/simplify/
 * - export-html (HTML export) - extensions/optional/export-html/
 * - Browser harness (CDP automation) - extensions/builtin/browser/ (opt-in since P6/EV03; source stays
 *   under builtin/ until the Q2 physical/package opt-in decision moves it to extensions/optional/ or a package)
 *
 * Product-approved optional source loaded by default:
 * - Evolution (controlled self-evolution) - extensions/optional/evolution/
 *
 * An entry whose compiled `index.js` and TypeScript `index.ts` are both absent is
 * skipped, so a missing optional resource degrades to "not loaded" rather than throwing.
 */
export declare function getBuiltinExtensionPaths(): string[];
/**
 * @deprecated Use getBuiltinExtensionPaths() instead
 */
export declare function getNanopencilDefaultExtensionPaths(): string[];
/**
 * @deprecated Use getBuiltinExtensionPaths() instead
 */
export declare function getCatuiDefaultExtensionPaths(): string[];