有什么方法可以在节点中使用 require 和 import

Question

I have two differents files in a node project, in one of them, I have to use a json file to extract an array, I was using require. In the other one, I have to import some features from a module. The problem is, importing is not working if I don't have

"type" : "module"

In my package.json, but doing this, require is not working. I tried to change require for import with the json file, but to execute, I have to use

node --experimental-json-modules file.js

And we are suppose not to use that flag when running.

Answer 1

You should pick require() or import - not both. When in an ESM module (where you can use import ), require() is not defined. If you want to use import for loading modules, then set up the "type": "module" properly and use import . Then, to load a JSON file, all it takes is a little function:

async function loadJSON(file) {
    let data = await fs.promises.readFile(file);
    return JSON.parse(data);
}

Or, if you want to do it synchronously:

function loadJSONSync(file)  {
    let data = fs.readFileSync(file);
    return JSON.parse(data);
}

Which you can put into a shared module itself so you can use it anywhere you want. Note that in both of these functions, you will need to catch errors. With the asynchronous option, it returns a promise and you need to check for both success and rejection. For the synchronous version, you need to catch any exceptions it might throw.