/**
 * GNU xstrtol suffix table restricted to the letters a command accepts:
 * letter L maps to 1024^n, LB to 1000^n and LiB to 1024^n; the special
 * letter b is 512 with no B/iB forms. The accepted letters differ per
 * coreutil (truncate takes g/t where split does not; od stops at E), so
 * each caller passes the exact set pinned against GNU 9.7.
 */
export declare function sizeSuffixes(letters: string): Record<string, number>;
/**
 * The digits of an xstrtoumax operand, read at GNU's base 0: `0x…` is
 * hex, a bare leading zero is octal, anything else decimal.
 *
 * A bigint, because the callers' ceilings (2**63 - 1, 2**64 - 1) are
 * boundaries a double cannot hold.
 */
export declare function parseBase0(digits: string): bigint;
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