method KeyStack.prototype.indexOfimport { KeyStack } from "https://dotland.deno.dev/x/oak@v12.3.0/deps.ts"; indexOf(data: Data, digest: string): Promise<number>Given data and a digest, return the current index of the key in the keys passed the constructor that was used to generate the digest. If no key can be found, the method returns -1. Parametersdata: Datadigest: stringReturnsPromise<number>