A vite-plugin for bringing mtime/atime of files in ./public to ./dist

keep-mtime.ts

import type {Plugin} from 'vite';
import path from 'path';
import fs from 'fs';

const publicDir = path.resolve(__dirname, '../../public');
const distDir = path.resolve(__dirname, '../../dist');

const copyMtime = (srcDir:string, dstDir:string):void => {
    console.log('keep-mtime: copying stat', srcDir, '->', dstDir);
  for (const file of fs.readdirSync(srcDir)) {
    const src = path.resolve(srcDir, file);
    const dst = path.resolve(dstDir, file);
    if (fs.statSync(src).isDirectory()) {
      copyMtime(src, dst);
      continue;
    }
    // copy mtime and atime
    const stat = fs.statSync(src);
    if (fs.existsSync(dst)) {
      fs.utimesSync(dst, stat.atime, stat.mtime);
    } else {
      console.warn("Expected file not found:", dst);
    }
  }
}

export function keepMtime(): Plugin {
  return {
    name: 'keep-mtime',
    enforce: 'post',
    applyToEnvironment: env => {
      return env.name === "client";
    },
    generateBundle: {
      order: "post",
      handler() {
        copyMtime(publicDir, distDir);
      }
    },
  };
}