function bytes.findIndeximport { bytes } from "https://deno.land/x/aleph@v0.2.27/std.ts"; const { findIndex } = bytes; findIndex(source: Uint8Array, pat: Uint8Array): numberFind first index of binary pattern from a. If not found, then return -1 Parameterssource: Uint8Arraysource array pat: Uint8Arraypattern to find in source array Returnsnumber