Can't use [chunkhash] for files

[barrysteyn]

With next v6.0.0, there is a manifest plugin written by @timneutkens. It should allow one to alter the webpack filenames like this in next.config.js:

const withHashedOutput = (nextConfig = {}) => {
  return Object.assign({}, nextConfig, {
    webpack(config, options) {
      if (!options.defaultLoaders) {
        throw new Error(
          'This plugin is not compatible with Next.js versions below 5.0.0 https://err.sh/next-plugins/upgrade'
        );
      }

      console.log(config);
      config.output.filename = isProduction ? '[name][chunkhash]' : '[name]';

      if (typeof nextConfig.webpack === 'function') {
        return nextConfig.webpack(config, options);
      }

      return config;
    }
  });
};
const config = withHashedOutput({});
module.exports = config;

NOTE: I have overridden _document.js

Expected Behavior

I would expect all file names to be hashed, and for next to have a proper mapping from the original file name to the hashed filename.

Current Behavior

_document.js is excluded from this mapping, so things fail.

Steps to Reproduce (for bugs)

1. Alter next.config.js by using the code pasted at the start of this bug
2. Note that files have hashes in them after this alteration (look in the .next folder)
3. Next will crash since it can't find _document

I have a suspicion (although unconfirmed) that _error and _app will also suffer from this (if overridden).

[timneutkens]

Doing:

config.output.filename = isProduction ? '[name][chunkhash]' : '[name]';

Is currently not supported, since you're changing the output of all files, instead of specific ones you're generating.

Adding hashes to page files is going to be up to us the future.

The pages-manifest.json wasn't added as a way to support , instead it was added as a way to speed up page resolving.

We don't ship this manifest to the client side, that's why pages can't be hashed like this.

[barrysteyn]

Hi Tim

Do you think this would be a nice feature? What is your estimated level of effort to get this going? If not incredibly high, I am thinking of implementing it myself?