A script to auto add // @ts-ignore to lines with TypeScript compilation error

auto-ts-ignore.ts

/**
 * A script to auto add // @ts-ignore to lines with TypeScript compilation error
 * Example usage:
 * $ npx tsc > compilation-errors.log
 * $ npx ts-node auto-ts-ignore.ts compilation-errors.log
 */

import { readFile, writeFile } from 'fs/promises'

const errorLogFile = process.argv[2]

async function main() {

  const errLineRegex = /(.+)\((\d+),\d+\): error/

  const errorLog = await readFile(errorLogFile, { encoding: 'utf-8' })

  const files: Record<string, number[]> = {}

  for (const line of errorLog.split('\n')) {
    const matched = errLineRegex.exec(line)
    if (matched !== null) {
      const filename = matched[1]
      const lineNumber = parseInt(matched[2], 10)
      files[filename] = files[filename] || []
      files[filename].push(lineNumber)
    }
  }

  for (const filename in files) {
    const lineNumbers = files[filename]
    const fileContent = (await readFile(filename, { encoding: 'utf-8' })).split('\n')
    // lineNumber is 1-based index
    const affectedLineContent: string[] = lineNumbers.map(lineNumber => fileContent[lineNumber - 1])
    lineNumbers.forEach((lineNumber, index) => {
      const lineContent = affectedLineContent[index]
      const numLeadingSpaces = lineContent.search(/\S/)
      const tsIgnoreContent = `${' '.repeat(numLeadingSpaces)}// @ts-ignore`
      fileContent.splice(index + lineNumber - 1, 0, tsIgnoreContent)
    })
    await writeFile(filename, fileContent.join('\n'), { encoding: 'utf-8' })
  }

}

main()