import type { CustomTheme } from '../custom-theme';
import type { MergeTheme } from '../merge-theme';
import type { StyleContextValue } from '../style-context';
import type { NumberValueWithPercentage } from '../theme';
import type { ThemeContextValue } from '../theme-context';
export declare type EmValue<V extends NumberValueWithPercentage = NumberValueWithPercentage> = V | keyof MergeTheme<CustomTheme>['spacing'];
export declare type EmReturnType<V extends EmValue> = V extends `${number}%` ? string : number;
export declare function em<V extends EmValue>(value: V, context: StyleContextValue, theme: ThemeContextValue): EmReturnType<V>;
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