/** True for null, undefined, or a string that is empty after trimming. */
declare const isValueEmpty: (value: string | null | undefined) => boolean;
/**
 * Structural equality, within the schema extraction limits: objects and lists nested more
 * than 10 levels deep, past the 10,000th compared in one call, or past 10,000 compared
 * properties, are treated as not equal (unless they are the same reference), so a huge
 * payload cannot overflow the stack or block. Binary data is compared by its bytes, never
 * enumerated.
 */
declare function deepEquals(x: any, y: any): boolean;
/** A schema as printed in debug logs: `{`, one `\t"name": "type"` per property (`;`-separated), `}`. */
declare const formatSchema: (schema: Array<{
    propertyName: string;
    propertyType: string;
}>) => string;
/** Trims a gateway option value; anything that is not a non-blank string is absent. */
declare const normalizeOption: (value: unknown) => string | undefined;
/**
 * No control character (Unicode Cc: C0, DEL, C1) may reach a header value; CR, LF and NUL
 * would split or end the header field. Tab is the one exception: it is valid in a value.
 */
declare const hasHeaderControlChar: (value: string) => boolean;
/** Node sends header values as Latin-1 and throws synchronously on anything above U+00FF. */
declare const hasNonLatin1Char: (value: string) => boolean;
/**
 * Milliseconds from a monotonic clock (process.hrtime): only differences are meaningful, and
 * they never jump with wall-clock changes. Shared by the deduplicator, AvoLog and the exit
 * drain deadline.
 */
declare const monotonicNowMs: () => number;
export { monotonicNowMs, isValueEmpty, deepEquals, formatSchema, normalizeOption, hasHeaderControlChar, hasNonLatin1Char };