app/node_modules/mhchemparser/tsconfig-es6.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "target": "ES6",
    "module": "ES6",
    "moduleResolution": "node",
    "outDir": "esm",
    "baseUrl": ".",
    "typeRoots": []
  }
}