export const builder = new SchemaBuilder<{}>(builderOptions);
Error:
error TS2351: This expression is not constructable.
Type 'typeof import("C:/Users/[...]/node_modules/@pothos/core/dts/index")' has no construct signatures.
Changes in our tsconfig:
Changed "module": "commonjs" to "module": "NodeNext"
Added line "moduleResolution": "NodeNext"
Full tsconfig.json:
  "compilerOptions": {
    "target": "ESNext",
    "module": "NodeNext",
    "allowJs": true,
    "declaration": false,
    "outDir": "built",
    "maxNodeModuleJsDepth": 10,
    "strict": true,
    "moduleResolution": "NodeNext",
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "skipLibCheck": true
  "include": ["src/**/*"],
  "exclude": ["node_modules"]
Package versions:
"@pothos/core": "^3.20.0"
"typescript": "^4.8.2"
Repository with error reproduction:

Repository: builder-ts-error-reproduction
          
Thanks for the report and reproduction!
I spent some time looking at this today, and I am very unclear on how this is supposed to work for packages supporting both esm and cjs.
Adding "type": "module" to package.json in pothos lets ts load the types correctly, but would completely break cjs support in pothos.
It also looks like if I duplicate type declaration into the esm directory and remove "types" "exports.types" from package.json things would also work.
This is a potential path forward, but would require 3 copies of the type definitions to be shipped.  I kinda suspect this might be a bug in typescript where they are not properly account for the combination of "nodeNext" with packages that define "exports" for both cjs and esm.
I won't have much time until late next week to dig into this more.  If you have ideas on a path forward I am happy to help implement, but I don't really have a good enough understanding of how all the different config options interact to know how to proceed at the moment.
          
After playing around with the error repoduction repo I succeed to make it works by changing this files :
src/index.mts
import { default as SchemaBuilder } from '@pothos/core'; // was import SchemaBuilder from "@pothos/core";
const builderOptions = {
  plugins: [],
export const builder = new SchemaBuilder<{}>(builderOptions);
tsconfig.json
  "compilerOptions": {
    "sourceMap": true,
    "outDir": "dist",
    "rootDir": "src",
    "target": "es2021",
    "module": "node16",
    "strict": true,
    "lib": ["es2021"],
    "esModuleInterop": true,
    "skipLibCheck": true
  "exclude": ["dist"]
BUT it only works up to Typescript version 4.8.2 ! If you install version 4.8.3 you will get
src/index.mts:7:28 - error TS2351: This expression is not constructable.
  Type 'typeof import("C:/Users/mboidin/Documents/Playgrounds/builder-ts-error-reproduction/node_modules/@pothos/core/dts/index")' has no construct signatures.
7 export const builder = new SchemaBuilder<{}>(builderOptions);
          
relevant typescript issue: microsoft/TypeScript#50762
Did some debugging, and it looks like the issue is that in nodeNext mode pothos at its root is a "cjs" package, and the "dts" files inside are treated as cjs in compatability mode.  This makes ts think that the default export is an object with a "default" property, rather than being the builder class itself.
          
Hum, now it's not working anymore :/
TSError: ⨯ Unable to compile TypeScript:

src/builder.mts:1:27 - error TS7016: Could not find a declaration file for module '@pothos/core'. 'C:/Users/mboidin/Documents/Projets/woozgo-backoffice-server/node_modules/@pothos/core/esm/index.js' implicitly has an 'any' type.

Try npm i --save-dev @types/pothos__core if it exists or add a new declaration (.d.ts) file containing declare module '@pothos/core';
1 import SchemaBuilder from '@pothos/core'