How come I am unable to fetch classes and enums from a namespace?

When using Typescript with pg-promise, I am facing an issue where I can't import the classes and enums as I normally would. Typically, when working with a library, I import a type, use it, and everything functions properly. However, in the snippet below, I am attempting to create a "mode" for my transactions by importing TransactionMode and isolationLevel, but they are showing up as undefined at runtime (despite no errors during design time and compile time). It's worth noting that esModuleInterop is set to true in my tsconfig.json.

import pgPromise, { isolationLevel, TransactionMode } from "pg-promise";

const pgp = pgPromise();

// This workaround seems to resolve the issue, even though it's not clear why it's needed.
// const { TransactionMode, isolationLevel } = pgp.txMode;

// Issue arises here where TransactionMode and isolationLevel are imported but undefined
const mode = new TransactionMode({ tiLevel: isolationLevel.serializable });

(...)

This adds unnecessary complexity to my code, rather than being able to directly utilize the names.

Answer №1

  • To import independently:
import {txMode} from 'pg-promise';

const {TransactionMode, isolationLevel} = txMode;
  • To import from the root interface:
import * as pgPromise from 'pg-promise';

const {TransactionMode, isolationLevel} = pgPromise.txMode;

why I can't import the various classes and enums as I usually do?

Due to pg-promise being a JavaScript library with TypeScript declarations added on top, it is not a native TypeScript module. The library was created before TypeScript existed.

P.S. I am the creator of pg-promise.

UPDATE

As a result of this issue, the declaration of txMode has been updated to resolve the initial problem.

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