CODEWITHSUNDEEP
node.jstypescript
blub
blub

Reputation: 692

Typescript recognizing process.env variables as undefined despite being in environment.d.ts

I had the impression that adding environment variables to environment.d.ts would ensure that they had the proper types.

I have @types/node as a dev-dependency, and have an environment.d.ts containing the following

declare global {
  namespace NodeJS {
    interface ProcessEnv {
      DATABASE_URL: string;
    }
  }
}

export {};

However, when I attempt to use DATABASE_URL, e.g. in

import PgPromise from "pg-promise";
const db = PgPromise()(process.env.DATABASE_URL || "");

I'm still getting the error

error TS2345: Argument of type 'string | undefined' is not assignable to parameter of type 'string | IConnectionParameters<IClient>'.
Type 'undefined' is not assignable to type 'string | IConnectionParameters<IClient>'.

Is there any way to ensure that DATABASE_URL is of type string, as opposed to string | undefined? Am I missing something?

Upvotes: 5

Views: 12193

Answers (1)

blub
blub

Reputation: 692

The error was coming from the fact that I was using ts-node.

I was using nodemon / ts-node, and ts-node uses files / include / exclude to determine what files to monitor. Because I didn't specify these, it wasn't able to detect my files.

I fixed it by adding

{
  ...,
  "ts-node": {
    "files": true
  },
  "include": ["src/**/*.ts", "environment.d.ts"]
}

to my tsconfig.json

Upvotes: 13

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