mastodon/config/vite/plugin-name-lookup.ts

import { relative, extname } from 'node:path';

import type { Plugin } from 'vite';

export function MastodonNameLookup(): Plugin {
  const nameMap: Record<string, string> = {};

  let root = '';

  return {
    name: 'mastodon-name-lookup',
    applyToEnvironment(environment) {
      return !!environment.config.build.manifest;
    },
    configResolved(userConfig) {
      root = userConfig.root;
    },
    generateBundle(options, bundle) {
      if (!root) {
        throw new Error(
          'MastodonNameLookup plugin requires the root to be set in the config.',
        );
      }

      // Iterate over all chunks in the bundle and create a lookup map
      for (const file in bundle) {
        const chunk = bundle[file];
        if (
          chunk?.type !== 'chunk' ||
          !chunk.isEntry ||
          !chunk.facadeModuleId
        ) {
          continue;
        }

        const relativePath = relative(
          root,
          sanitizeFileName(chunk.facadeModuleId),
        );
        const ext = extname(relativePath);
        const name = chunk.name.replace(ext, '');

        if (nameMap[name]) {
          throw new Error(
            `Entrypoint ${relativePath} conflicts with ${nameMap[name]}`,
          );
        }

        nameMap[name] = relativePath;
      }

      this.emitFile({
        type: 'asset',
        fileName: '.vite/manifest-lookup.json',
        source: JSON.stringify(nameMap, null, 2),
      });
    },
  };
}

// Taken from https://github.com/rollup/rollup/blob/4f69d33af3b2ec9320c43c9e6c65ea23a02bdde3/src/utils/sanitizeFileName.ts
// https://datatracker.ietf.org/doc/html/rfc2396
// eslint-disable-next-line no-control-regex
const INVALID_CHAR_REGEX = /[\u0000-\u001F"#$%&*+,:;<=>?[\]^`{|}\u007F]/g;

function sanitizeFileName(name: string): string {
  return name.replace(INVALID_CHAR_REGEX, '');
}