@terminus/ngx-tools/type-guards/is-boolean/is-boolean.d.ts

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/**
 * Determine if a value is a boolean
 *
 * @param value - The value to test
 * @returns The result
 *
 * @example
 * isBoolean(true);  // Returns: true
 * isBoolean('foo'); // Returns: false
 */
export declare const isBoolean: (value: any) => value is boolean;