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I'm working on adding support for .js config file in a NodeJS library. NodeJS support two module system - ESM & CommonJS - and since javascript files with .js can be treated as an ES Module or a Common JS module based on the what is defined as type parameter in package.json, I'm not able to figure out, how to know that what module system is a user of the library is using. Based on the module system used by the user only I can decide whether to import config using require() or import()

Anshul Sahni
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  • based on [this](https://nodejs.org/docs/latest/api/packages.html#packagejson-and-file-extensions), I think you just need to add `type: "commonjs"` so both `commonjs` & `module` users can use your library. – bogdanoff Aug 05 '22 at 07:08

1 Answers1

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There isn't a good way too know about the module type of the application code form a node module. One workaround that I can think of would be using something like parent-package-json –

import getParent from 'parent-package-json';
const parent = getParent();
 
const parentModuleType = parent ? parent.type : DEFAULT_MODULE_TYPE;
tbking
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