/**
 * Verifies if a request's signature is correct. This code could serve as a reference implementation for verifying the signature in a request from Slack.
 * @param signingSecret signing secret
 * @param signingSecret signing secret
 * @param requestHeaders request headers
 * @param requestBody request body
 * @returns true if the given signature is valid
 */
export declare function verifySlackRequest(signingSecret: string, requestHeaders: Headers, requestBody: string): Promise<boolean>;
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