eslint suppresor

eslint_suppresor.js

/* eslint-env node */

const fs = require(`fs`);
// Generated using: node node_modules/eslint/bin/eslint.js -c .eslintrc.js media/**/*.es5.js -f json > _errors.json
const errors = JSON.parse(fs.readFileSync(`_errors.json`));

for (const error of errors) {
  const {filePath, messages, source} = error;
  const fileRuleTally = {};
  const undefs = new Set();
  for (const errMessage of messages) {
    const {ruleId, message} = errMessage;
    if (!fileRuleTally[ruleId]) fileRuleTally[ruleId] = 0;
    fileRuleTally[ruleId]++;

    if (ruleId === `no-undef`) {
      const undef = message.match(/'(\w+)' is not defined/)[1];
      undefs.add(undef);
    }
  }

  if (source) {
    let oldSource = source.trimLeft();
    const eslintCommentMatch = oldSource.match(/^\/\* eslint (.*) \*\/\n/);
    if (eslintCommentMatch) {
      // update existing rules
      eslintCommentMatch[1]
        .split(`, `)
        .forEach(r => fileRuleTally[r.split(`:`)[0]] = 1);
      oldSource = oldSource.substr(eslintCommentMatch[0].length);
    }

    const strSort = (a, b) => a.toLowerCase().localeCompare(b.toLowerCase());
    const rules = Object.keys(fileRuleTally).sort(strSort).filter(r => r !== `no-undef`);
    const supressComment = rules.length ?
      `/* eslint ${rules.map(r => `${r}: 0`).join(`, `)} */\n` :
      ``;
    const globalsComment = undefs.size ?
      `/* globals ${Array.from(undefs).sort(strSort).join(`, `)} */\n`:
      ``;
    console.info(filePath);
    const newSource = supressComment + globalsComment + oldSource;
    fs.writeFileSync(filePath, newSource);
  }
}