replace-all-rem.js

replace-all-rem.js

const { writeFile } = require('fs')
const fsp = require('fs/promises')
const { parse } = require('path')

;(async () => {
  const files = await fsp.readdir('./', {recursive: true})
  for(const file of files){
    if(['.js', '.json', '.css', '.liquid', '.html'].includes(parse(file).ext)){
      const data = await fsp.readFile(file, 'utf8')
      const replaced = data.replace(/(\d+(\.\d+)?|\.?\d+|0)rem/g, match => {
        const num = Number(match.replace('rem', ''))
        return `${Math.round(num * 0.625 * 100) / 100}rem`
      })
      await fsp.writeFile(file, replaced)
    }
  }
})()