/**
 * px を em に変換し、文字列で返す
 * @param {number|string} px
 * @param {number|string} baseFontSize
 * @param {object} options
 * @param {number} options.precision
 * @returns {string}
 */
type PxToEmOptions = {
    precision?: number;
    errorMessage?: string;
};
export declare function pxToEm(px: string | number, baseFontSize: string | number, options?: PxToEmOptions): string;
export {};
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