Disable all existing ESlint errors with eslint-disable-line

boy_scout.js

// First, run eslint -f json -o warnings.json
// Then, run this file
const fs = require('fs')
const json = require('./warnings.json')

json.forEach(({ filePath, messages, source }) => {
  // if there is no source we have nothing that needs to be eslint-ignore'd
  if (!source) {
    return
  }

  const data = source.split('\n')

  // if the source has multiple lines which need to be eslint-ignored our offset changes per addition
  // offset is 1 because line numbers start at 1 but index numbers in an array start at 0
  let offset = 1

  // group errors/warnings by line because we want to have one eslint disable comment with all the rules to disable
  const groupedMessages = messages.reduce((acc, next) => {
    const prevMessages = acc[next.line] ? acc[next.line] : []
    // some lines may have the same rule twice
    const duplicateRuleForLine = prevMessages.find(
      (message) => message.ruleId === next.ruleId
    )
    // ignore jsx and graphql lint rules
    const applicableRule =
      next.ruleId &&
      !next.ruleId.includes('jsx') &&
      !next.ruleId.includes('graphql')

    // ignore the eslint-ignore addition for duplicates and non applicable rules
    if (duplicateRuleForLine || !applicableRule) {
      return acc
    }

    return {
      ...acc,
      [next.line]: [...prevMessages, next]
    }
  }, {})
  Object.entries(groupedMessages).forEach(([line, messages]) => {
    // grouped ignores
    const ignore = `// eslint-disable-next-line ${messages
      .map(({ ruleId }) => ruleId)
      .join(',')}`
    data.splice(line - offset, 0, ignore)
    data.splice(line - offset, 0, '// TODO fix')
    offset -= 2
  })
  const updated = data.join('\n')

  fs.writeFile(filePath, updated, (err) => {
    if (err) return console.log(err)
  })
})