export type Vec2 = {
    x: number;
    y: number;
};
/**
 * @returns Vector Length Squared
 */
export declare function len2(a: Vec2): number;
export declare function length(a: Vec2): number;
export declare function distance(a: Vec2, b: Vec2): number;
export declare function distance2(a: Vec2, b: Vec2): number;
export declare function normalize(a: Vec2): {
    x: number;
    y: number;
};
/**
 * Normalize Vector but return zero Vector when length is zero
 */
export declare function normalizeSafe(v: Vec2): Vec2;
/**
 * @param theta (in radians)
 */
export declare function fromAngle(theta: number): {
    x: number;
    y: number;
};
export declare function vec2(x?: number, y?: number): {
    x: number;
    y: number;
};
export declare function add(a: Vec2, b: Vec2): {
    x: number;
    y: number;
};
export declare function sub(a: Vec2, b: Vec2): {
    x: number;
    y: number;
};
/**
 * Multiply by a Scalar
 */
export declare function mulScalar(v: Vec2, s: number): {
    x: number;
    y: number;
};
export declare function dot(a: Vec2, b: Vec2): number;
export declare function mul(a: Vec2, b: Vec2): {
    x: number;
    y: number;
};
/**
 * @returns The perpendicular Vector
 */
export declare function perp(a: Vec2): {
    x: number;
    y: number;
};
export declare function project(a: Vec2, target: Vec2): {
    x: number;
    y: number;
};
export declare function clampLength(a: Vec2, max: number, min?: number): {
    x: number;
    y: number;
};
/**
 * Rotate the Vector by theta amount
 * @param theta (in radians)
 */
export declare function rotateVec2(v: Vec2, theta: number): Vec2;
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