/**
 * Shared number-formatting helper used by `<Progress.Root>` and
 * `<Meter.Root>`. Both components format a numeric value for display using
 * the same algorithm: if an explicit `format` is provided, pass the value
 * through `Intl.NumberFormat` verbatim; otherwise use a percent formatter
 * applied to `value / 100`.
 *
 * A module-scope cache keyed by `(locale, options)` keeps repeated formats
 * O(1). Construction of `Intl.NumberFormat` is the expensive step; the
 * formatters themselves are cheap to re-use.
 */
/**
 * Formats a numeric value for display. Returns `""` if `value` is `null`
 * (matches progress's indeterminate state). If `format` is undefined, the
 * default is a percentage applied to `value / 100` — so a raw value of `42`
 * yields `"42%"` under an `en-US` locale.
 */
export declare function formatNumberValue(value: number | null, locale: Intl.LocalesArgument | undefined, format: Intl.NumberFormatOptions | undefined): string;
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