Utilize Meteor's ability to import async functions for seamless integration into method calls

Encountering an issue with this Meteor app where the error

 TypeError: vinXXX is not a function
occurs when attempting to call an exported async function named "vinXXX" from within a method call in a sibling folder, which has been imported in the methods folder. Any insights on why this is happening and how it can be resolved would be greatly appreciated.

//imports/api/vehicles/methods.js

import { vinXXX } from './vinXXX.js'
Meteor.methods({
    'extractData': function (plate) {
        console.log('method called: ', plate)
        vinXXX(plate, 'UUU');  // CAR HISTORY
    }
});



//imports/api/vehicles/vinXXX.js

const vinXXX = async (plate, state) => {...}
module.exports = vinXXX;

Answer №1

Basically, you have a combination of ES module import syntax and commonJS export syntax in your code. Meteor allows them to work together through transpilation, but it's important to understand how each one operates to effectively store and retrieve data.

To make the mixed syntaxes function properly, either change your import to use ES module default import syntax or adjust your export to include a named property on the exported object.

For changing the export to include an object with a property for your named import:

//imports/api/vehicles/methods.js

import vinXXX from './vinXXX.js'
Meteor.methods({
    'extractData': function (plate) {
        console.log('method called: ', plate)
        vinXXX(plate, 'UUU');  // CAR HISTORY
    }
});

//imports/api/vehicles/vinXXX.js

const vinXXX = async (plate, state) => {...}
module.exports = { vinXXX };

Regarding changing the import to a default ES Module import:

//imports/api/vehicles/methods.js

import { vinXXX } from './vinXXX.js'
Meteor.methods({
    'extractData': function (plate) {
        console.log('method called: ', plate)
        vinXXX(plate, 'UUU');  // CAR HISTORY
    }
});



//imports/api/vehicles/vinXXX.js

const vinXXX = async (plate, state) => {...}
module.exports = vinXXX;

You have the option to solely utilize one syntax without mixing them.

For CommonJS default exports:

//imports/api/vehicles/methods.js

const vinXXX = require('./vinXXX.js')
Meteor.methods({
    'extractData': function (plate) {
        console.log('method called: ', plate)
        vinXXX(plate, 'UUU');  // CAR HISTORY
    }
});



//imports/api/vehicles/vinXXX.js

const vinXXX = async (plate, state) => {...}
module.exports = vinXXX;

CommonJs named export example:

//imports/api/vehicles/methods.js

const { vinXXX } = require('./vinXXX.js')
Meteor.methods({
    'extractData': function (plate) {
        console.log('method called: ', plate)
        vinXXX(plate, 'UUU');  // CAR HISTORY
    }
});



//imports/api/vehicles/vinXXX.js

const vinXXX = async (plate, state) => {...}
module.exports = { vinXXX };

For ES Module default syntax:

//imports/api/vehicles/methods.js

import vinXXX from './vinXXX.js'
Meteor.methods({
    'extractData': function (plate) {
        console.log('method called: ', plate)
        vinXXX(plate, 'UUU');  // CAR HISTORY
    }
});



//imports/api/vehicles/vinXXX.js

export default async (plate, state) => {...}

And finally, for ES Module Named export:

//imports/api/vehicles/methods.js

import { vinXXX } from './vinXXX.js'
Meteor.methods({
    'extractData': function (plate) {
        console.log('method called: ', plate)
        vinXXX(plate, 'UUU');  // CAR HISTORY
    }
});



//imports/api/vehicles/vinXXX.js

export const vinXXX = async (plate, state) => {...}

Answer №2

The setting for exports is directly to vinXXX, rather than an object that includes it. Therefore, your import statement must be for the default value:

import vinXXX from './vinXXX.js'

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