addEslintComments.js

#!/usr/bin/env node

const fs = require('fs');
const { createInterface } = require('readline');

const rl = createInterface(process.stdin);
const tempFile = `${__dirname}/eslint-temp.txt`;

(async () => {
  let file = '';
  const lineNumbers = new Set();

  const writeFile = async () => {
    const originalStream = fs.createReadStream(file, 'utf8');
    const inStream = createInterface(originalStream);
    const it = inStream[Symbol.asyncIterator]();
    const outStream = fs.createWriteStream(tempFile, 'utf8');
    for (let i = 0, line = await it.next(); !line.done; i++, line = await it.next()) {
      if (lineNumbers.has(i)) {
        const match = line.value.match(/^ +/);
        const spaces = match ? match[0] : '';
        outStream.write(`${spaces}// eslint-disable-next-line ${process.argv[2]}\n`);
      }

      outStream.write(`${line.value}\n`);
    }

    const outStreamClosed = new Promise((resolve) => outStream.on('close', resolve));
    outStream.close();
    await outStreamClosed;
    fs.renameSync(tempFile, file);
  };

  for await (const line of rl) {
    if (!line.endsWith('.ts') && !/\d:\d/.test(line)) continue;
    if (line.endsWith('.ts')) {
      if (file) {
        await writeFile();
      }
      file = line;
      lineNumbers.clear();
    } else {
      lineNumbers.add(Number(line.match(/(\d+):\d/)[1]) - 1);
    }
  }
  await writeFile();
})();