Conditional import to switch implementations

user_332148 0
Viewed 17977

I have node.js application written in TypeScript and I need to switch between two interface implementations based on the config file. Currently I have this code which seems to be working.

"use strict";

import { config } from "../config";

let Something;
if (config.useFakeSomething) {
    Something = require("./FakeSomething").FakeSomething;
} else {
    Something = require("./RealSomething").RealSomething;
}
...
let s = new Something();
s.DoStuff();
...

But I have bad gut feeling about that (mainly because of the mixing require and import for loading modules). Is there some other way how to achieve implementation switching based on config file without importing both modules?

typescript node.js
4 Answers

In addition to the correct answers above, in case you need this switching for many files within a single folder, you can use a symbolic-link (not available on Windows) that referenced to the right folder, so your code remains clean.

This approach is good for switching between real code and stubs, for instance

user_27674130
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