/**
 * Canonical identities shared by CSS generation, cache, and control-plane boundaries.
 *
 * This module deliberately has no vendor dependencies. Cache identities may cross
 * process and service boundaries, so accepting two strings with the same encoded
 * representation—or an unbounded string—is unsafe even when TypeScript calls the
 * value a `string`.
 *
 * @module utils/css-artifact-identity
 */
/** Maximum UTF-16 code units accepted for one complete CSS pipeline identity. */
export declare const MAX_CSS_PIPELINE_IDENTITY_CODE_UNITS = 2048;
/** Maximum encoded UTF-8 bytes accepted for one complete CSS pipeline identity. */
export declare const MAX_CSS_PIPELINE_IDENTITY_UTF8_BYTES = 2048;
/** Whether a value is safe to compare, encode, and persist as a CSS pipeline identity. */
export declare function isCSSPipelineIdentity(value: unknown): value is string;
/** Validate and return an immutable string snapshot for cache or wire use. */
export declare function assertCSSPipelineIdentity(value: unknown, label?: string): string;
/** Whether a value is the canonical style-scope profile SHA-256 identity. */
export declare function isStyleProfileHash(value: unknown): value is string;
/** Validate and return the canonical style-scope profile SHA-256 identity. */
export declare function assertStyleProfileHash(value: unknown, label?: string): string;
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