/**
 * Feature-areas compiler floor + capability recognition (hierarchical
 * areas, v2 feature 01) — extracted from commands/compile.ts so the
 * fail-closed predicates are unit-testable (design §3.3 last row / §6
 * row 15: the CLI must refuse output from a compiler that predates the
 * `areas` payload, INCLUDING when meta.version is absent entirely).
 */
/**
 * The oldest compiler version whose /compile understands the `areas`
 * payload. When the project declares areas and the responding compiler's
 * meta.version is BELOW this floor — or the version field is ABSENT
 * (pre-meta compilers) — the CLI fails BEFORE accepting output: an old
 * compiler silently ignores the unknown `areas` key and would compile the
 * project without its area namespaces.
 */
export declare const FEATURE_AREAS_COMPILER_FLOOR = "0.56.0";
/** Capability names this CLI understands (config `requires: [...]`). */
export declare const RECOGNIZED_CAPABILITIES: ReadonlySet<string>;
/**
 * Semver compare over `major.minor.patch` with prerelease awareness:
 * `0.56.0-beta` orders BELOW `0.56.0` (SemVer §11) — a prerelease compiler
 * that predates the final area contract must not pass a floor set at the
 * release version. Build metadata (`+...`) is ignored per SemVer §10.
 * Numeric components are compared numerically; a missing component is 0.
 */
export declare function compareVersions(a: string, b: string): number;
/**
 * Fail-closed floor predicate: true when the reported compiler version
 * satisfies the feature-areas floor. Absent/empty version → false (never
 * assume support).
 */
export declare function compilerSupportsAreas(version: string | undefined | null): boolean;
/**
 * The first `requires:` capability this CLI does not recognize, or
 * undefined when all are known. An unknown capability means this CLI
 * predates it — the caller must fail before loading anything.
 */
export declare function firstUnknownCapability(requires: readonly string[] | undefined): string | undefined;
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