/** Nonnegative authored layout length with finite, unit-specific bounds. */
export declare function safeCssLength(value: string | undefined): string | undefined;
/** Signed counterpart for offsets and intentional layout overlap. */
export declare function safeCssSignedLength(value: string | undefined): string | undefined;
export declare function safeCssFontSize(value: string | undefined): string | undefined;
export declare function safeCssLineHeight(value: string | undefined): string | undefined;
export declare function safeCssLetterSpacing(value: string | undefined): string | undefined;
/** Authored CSS color limited to literals and theme custom-property references. */
export declare function safeCssColor(value: string | undefined): string | undefined;
/** Theme focus rings cannot be authored away or expanded into page geometry. */
export declare function safeCssFocusRingWidth(value: string | undefined): string | undefined;
export declare function safeCssFocusRingOffset(value: string | undefined): string | undefined;
export declare function safeCssFocusRingColor(value: string | undefined): string | undefined;
/** A quoted font-family value that can be interpolated without CSS escaping. */
export declare function safeCssFontFamily(value: unknown): string | undefined;
/** A generic fallback family, kept unquoted at the end of a font stack. */
export declare function safeCssGenericFontFamily(value: unknown): string | undefined;
export declare function safeCssFontSrc(value: unknown): string | undefined;
/** CSS font-weight value or ascending variable-font weight range. */
export declare function safeCssFontWeight(value: unknown): string | undefined;
export declare function safeCssFontStyle(value: unknown): string | undefined;
/** Bounded percentage used by CSS Fonts metric override descriptors. */
export declare function safeCssFontMetricPercentage(value: unknown): string | undefined;
/** Comma-separated CSS unicode-range descriptors with a defensive size cap. */
export declare function safeCssUnicodeRange(value: unknown): string | undefined;
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