add-eslint-ignore.js

const fs = require('fs');
const { uniq } = require('ramda');
const errors = require('./eslint2.json');

function insertBeforeLine(filename, line, text) {
    const fileData = fs
        .readFileSync(filename)
        .toString()
        .split('\n');
    fileData.splice(line - 1, 0, text);
    const newData = fileData.join('\n');

    fs.writeFileSync(filename, fileData.join('\n'));
}

errors.forEach(file => {
    if (!file.messages.length) {
        return;
    }

    const messages = file.messages.reduce((acc, msg) => {
        if (!acc.has(msg.line)) {
            acc.set(msg.line, []);
        }

        acc.get(msg.line).push(msg.ruleId);

        return acc;
    }, new Map());

    let offset = 0;

    messages.forEach((ruleIds, line) => {
        const uniqueRules = uniq(ruleIds);
        const exclude = `// eslint-disable-next-line ${uniqueRules.join(', ')}`;

        insertBeforeLine(file.filePath, line + offset, exclude);

        offset += 1;
    });
});