/**
 * Test for whether two numbers are close enough to each other,
 * within an acceptable margin.
 */
export declare const closeTo: (a: number, b: number, epsilon?: number) => boolean;
/**
 * Test for whether a number is close enough to zero, within an
 * acceptable margin.
 */
export declare const closeToZero: (n: number, epsilon?: number) => n is 0;
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