proj4/dist/lib/deriveConstants.d.ts

Proj4js is a JavaScript library to transform point coordinates from one coordinate system to another, including datum transformations.

export function eccentricity(a: any, b: any, rf: any, R_A: any): {
    es: number;
    e: number;
    ep2: number;
};
export function sphere(a: any, b: any, rf: any, ellps: any, sphere: any): {
    a: any;
    b: any;
    rf: any;
    sphere: any;
};