to-esm-transform.ts

import { ImportDeclaration, API, FileInfo, Options } from 'jscodeshift';
import fs from 'fs';
import path from 'path';

const nodeExternals = new Set([
  "path",
  "fs",
  "fs/promises",
])

const replace = {
  "cborg": "@fireproof/vendor/cborg",
  "cborg/utils": "@fireproof/vendor/cborg/utils",
  "cborg/json": "@fireproof/vendor/cborg/json",
  "cborg/length": "@fireproof/vendor/cborg/length",
  "cborg/taglib": "@fireproof/vendor/cborg/taglib",
  "@ipld/dag-json": "@fireproof/vendor/@ipld/dag-json",
  "@ipld/dag-cbor": "@fireproof/vendor/@ipld/dag-cbor",
}

// eslint-disable-next-line @typescript-eslint/no-unused-vars
export default function(fileInfo: FileInfo, api: API, options: Options) {
  //const orig = fileInfo.source;
  // const oname = path.join(__dirname, 'src/', fileInfo.path.replace('node_modules/', ''))
  // fs.mkdirSync(path.dirname(oname), { recursive: true });
  // fs.writeFileSync(oname,
  return  api.jscodeshift(fileInfo.source)
    .find(ImportDeclaration)
    .map(path => {
      // const node = path.node;
      const val = path.node.source.value?.toString() || '';
      if (nodeExternals.has(val)) {
        return path
      } else if (replace[val]) {
        path.node.source.value = replace[val];
      }
      // else if (/^[^.].*/.test(val)) {
      //  // eslint-disable-next-line no-console
      //  // console.log(path.node.source)
      //  path.node.source.value = `https://esm.sh/${path.node.source.value}`;
      // }
      return path//.node as unknown as ASTPath<ASTNode>;
    })
    .toSource()
  //return orig;
}