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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.import * as path from "../path/mod.ts";
export function charCode(s: string): number {  return s.charCodeAt(0);}
/** Create or open a temporal file at specified directory with prefix and *  postfix * */export async function tempFile(  dir: string,  opts: {    prefix?: string;    postfix?: string;  } = { prefix: "", postfix: "" },): Promise<{ file: Deno.File; filepath: string }> {  const r = Math.floor(Math.random() * 1000000);  const filepath = path.resolve(    `${dir}/${opts.prefix || ""}${r}${opts.postfix || ""}`,  );  await Deno.mkdir(path.dirname(filepath), { recursive: true });  const file = await Deno.open(filepath, {    create: true,    read: true,    write: true,    append: true,  });  return { file, filepath };}