/**
 * Extract an object from another object using specific fields
 * @param jsonObj The source object
 * @param wantedFields The required fields
 * @signature
 *    U.extractFromObj(jsonObj, wantedFields)
 *
 * @example
 *    U.extractFromObj({ a: 1, b: 2 }, ['a']) // => { a: 1 }
 *
 */
export declare function extractFromObj(jsonObj: object, wantedFields: string[]): object;
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