/**
 * Unit conversion utilities for EDA operations
 */
export declare const EASYEDA_TO_MM = 0.254;
export declare const MM_TO_EASYEDA: number;
export declare const MM_TO_MIL = 39.3701;
export declare const MIL_TO_MM = 0.0254;
export declare const MM_TO_INCH = 0.0393701;
export declare const INCH_TO_MM = 25.4;
/**
 * Convert EasyEDA units to millimeters
 */
export declare function easyedaToMm(value: number): number;
/**
 * Convert millimeters to EasyEDA units
 */
export declare function mmToEasyeda(value: number): number;
/**
 * Convert mils to millimeters
 */
export declare function milToMm(value: number): number;
/**
 * Convert millimeters to mils
 */
export declare function mmToMil(value: number): number;
/**
 * Convert inches to millimeters
 */
export declare function inchToMm(value: number): number;
/**
 * Convert millimeters to inches
 */
export declare function mmToInch(value: number): number;
/**
 * Round to a specific number of decimal places
 */
export declare function roundTo(value: number, decimals?: number): number;
/**
 * Convert angle from degrees to radians
 */
export declare function degToRad(degrees: number): number;
/**
 * Convert angle from radians to degrees
 */
export declare function radToDeg(radians: number): number;
/**
 * Normalize angle to 0-360 range
 */
export declare function normalizeAngle(angle: number): number;
/**
 * Calculate trace width for given current and temperature rise
 * Using IPC-2221 standard for external layers
 * @param currentAmps - Current in amperes
 * @param tempRiseC - Temperature rise in Celsius (default 10)
 * @param copperOz - Copper weight in oz/ft² (default 1)
 * @returns Trace width in mm
 */
export declare function calculateTraceWidth(currentAmps: number, tempRiseC?: number, copperOz?: number): number;
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