converse-built/node_modules/outdent/tsconfig-module.json

{
  "$schema": "http://json.schemastore.org/tsconfig",
  "extends": "./tsconfig-lib.json",
  "compilerOptions": {
    // Emit exactly the same code as normal tsconfig, but with ES6 import & export statements instead of CommonJS
    "module": "esnext",
    "outDir": "lib-module"
  }
}