Can't add generated TypeScript module file to global space

I have generated (from GraphQL Codegen and my API) a TypeScript types modules file and want to add all of its types to my project, application-wide (globally). The types are in src/generated/generatedTypes.ts which also has an export {}; line (making it a module).

tsconfig.ts defines:

"include": [
  "src/generated", // bring in my generated types
  "**/*.ts", // bring in the rest of the project's files

The first include directive tells TypeScript to load all the types from my src/generated folder (including generatedTypes.ts). However, inside my .ts files I still get "Cannot find name SomeType" errors; the types aren't there. How can I make the types in generatedTypes.ts available to the rest of my project?

Full tsconfig.ts file:

{
  "ts-node": {
    "require": ["tsconfig-paths/register"]
  },
  "compilerOptions": {
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "baseUrl": "./",
    "checkJs": true,
    "skipLibCheck": true,
    "strict": false,
    "forceConsistentCasingInFileNames": true,
    "noEmit": true,
    "incremental": true,
    "esModuleInterop": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "jsx": "preserve",
    "paths": {
      "app/*": ["./app/*"],
      "pages/*": ["./pages/*"],
      "src/*": ["./src/*"]
    },
    "plugins": [
      { "name": "next" }
    ],
    "strictNullChecks": true,
    "target": "es2017",
    // "types": ["node"],
    // "typeRoots": ["./node_modules/@types", "./src/generated"]

  },
  "include": [
    "src/generated",
    "next-env.d.ts",
    ".next/types/**/*.ts",
    "**/*.d.ts",
    "**/*.ts",
    "**/*.tsx",
    "**/*.js",
    "postgraphile.cjs",
  ],
  "exclude": ["node_modules", "migrations/**"],
  "skipLibCheck": false,
  // "skipLibCheck": true /* Skip type checking all .d.ts files. */
}

The types in generatedTypes.ts aren't important but the file looks like:

export {};

type System = GQLNode & {
  __typename?: 'System';
  createdAt?: Maybe<Scalars['Datetime']['output']>;
  // lots more definition
};
// lots more types

There is no global declaration in the file because I didn't think it was necessary. The end of the file is just:

type SignupMutation = {
  __typename?: 'Mutation';
  registerUser?: {
    __typename?: 'RegisterUserPayload';
    jwtToken?: any | null;
  } | null;
};

With help (from @Eric MORAND in the comments; now deleted, but thank you!), I found the problem: my types weren't wrapped in a global declaration.

With GraphQL Codegen you need to add noExport: true under the generates config in the codgen.ts or codgen.yaml file to have it add the relevant wrapper:

declare global {
 // file contents
}