const { sha1 } = require("crypto-hash");
const fs = require("fs");
const path = require("path");
const crypto = require("crypto");

main();

async function main() {
  const filePath = "foo.txt";
  const buf = fs.readFileSync(filePath);
  const str = fs.readFileSync(filePath, {
    encoding: "utf8",
  });
  console.log(await sha1(buf));
  console.log(await sha1(str));
  console.log(
    await new Promise((resolve, reject) => {
      const hash = crypto.createHash("sha1");
      const input = fs.createReadStream(filePath);
      input.on("readable", () => {
        const data = input.read();
        if (data) {
          hash.update(data);
        } else {
          resolve(hash.digest("hex"));
        }
      });
    })
  );
}