nixpkgs/pkgs/development/tools/yarn2nix-moretea/internal/fixup_yarn_lock.js

#!/usr/bin/env node

/* Usage:
 * node fixup_yarn_lock.js yarn.lock
 */

const fs = require("fs");
const readline = require("readline");

const urlToName = require("../lib/urlToName");

const yarnLockPath = process.argv[2];

const readFile = readline.createInterface({
  input: fs.createReadStream(yarnLockPath, { encoding: "utf8" }),

  // Note: we use the crlfDelay option to recognize all instances of CR LF
  // ('\r\n') in input.txt as a single line break.
  crlfDelay: Infinity,

  terminal: false // input and output should be treated like a TTY
});

const result = [];

readFile
  .on("line", line => {
    const arr = line.match(/^ {2}resolved "([^#]+)(#[^"]+)?"$/);

    if (arr !== null) {
      const [_, url, shaOrRev] = arr;

      const fileName = urlToName(url);

      result.push(`  resolved "${fileName}${shaOrRev ?? ""}"`);
    } else {
      result.push(line);
    }
  })
  .on("close", () => {
    fs.writeFile(yarnLockPath, result.join("\n"), "utf8", err => {
      if (err) {
        console.error(
          "fixup_yarn_lock: fatal error when trying to write to yarn.lock",
          err
        );
      }
    });
  });