graphql-let: Failed to generate .d.ts.Error: Failed to generate .d.ts.

Something in the new reslease broke the generation of .d.ts.

I’m getting the error

yarn run v1.22.4
$ graphql-let
[ graphql-let ] Generating .d.ts...
[ graphql-let ] Failed to generate .d.ts.Error: Failed to generate .d.ts.
    at Object.genDts (C:\Users\USER_NAME\client\node_modules\graphql-let\dist\lib\dts.js:71:15)
    at processDtsForCodegenContext (C:\Users\USER_NAME\client\node_modules\graphql-let\dist\lib\full-generate.js:97:31)
    at Object.fullGenerate [as default] (C:\Users\USER_NAME\client\node_modules\graphql-let\dist\lib\full-generate.js:112:15)
    at async gen (C:\Users\USER_NAME\client\node_modules\graphql-let\dist\gen.js:26:28)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! with-typescript-graphql@0.1.0 dev: `yarn codegen && next`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the with-typescript-graphql@0.1.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\matthiass\AppData\Roaming\npm-cache\_logs\2020-07-10T16_41_33_559Z-debug.log

I just did a clean

yarn create next-app --example with-typescript-graphql with-typescript-graphql-app
yarn
yarn dev

Here is my package.json

{
  "name": "with-typescript-graphql",
  "version": "0.1.0",
  "author": "",
  "license": "ISC",
  "scripts": {
    "codegen": "graphql-let",
    "dev": "yarn codegen && next",
    "build": "yarn codegen && next build",
    "start": "next start"
  },
  "dependencies": {
    "@apollo/react-common": "3.1.4",
    "@apollo/react-components": "^3.1.5",
    "@apollo/react-hooks": "3.1.5",
    "apollo-cache": "^1.3.5",
    "apollo-cache-inmemory": "^1.6.6",
    "apollo-client": "^2.6.10",
    "apollo-link": "1.2.14",
    "apollo-link-http": "1.5.17",
    "apollo-link-schema": "1.2.5",
    "apollo-server-micro": "^2.14.2",
    "apollo-utilities": "^1.3.3",
    "graphql": "^14.6.0",
    "graphql-tag": "^2.10.3",
    "next": "latest",
    "react": "^16.13.1",
    "react-dom": "^16.13.1"
  },
  "devDependencies": {
    "@graphql-codegen/cli": "^1.15.1",
    "@graphql-codegen/plugin-helpers": "^1.15.1",
    "@graphql-codegen/typescript": "^1.13.3",
    "@graphql-codegen/typescript-operations": "^1.13.3",
    "@graphql-codegen/typescript-react-apollo": "^1.13.3",
    "@graphql-codegen/typescript-resolvers": "^1.15.1",
    "@types/react": "^16.9.34",
    "@types/react-dom": "^16.9.7",
    "graphql-let": "0.x",
    "typescript": "^3.8.3"
  }
}

On a windows machine with npm@latest

Reverting to graphql-let: "0.10.0" fixed the issue