SyntaxError: Missing initializer in destructuring declaration

Question

I am running this on Node.js version 6.9.5

I have this code:

let {Schema}, mongoose = require('mongoose');

which is in theory a simplified version of:

let mongoose = require('mongoose');
let Schema = mongoose.Schema;

I get this error:

let {Schema}, mongoose = require('mongoose');
    ^^^^^^^^
SyntaxError: Missing initializer in destructuring declaration

I tried this instead:

let mongoose, {Schema} = require('mongoose');

I got a different error, which was the result of "mongoose" being undefined.

I thought it was possible to do something like this, what am I doing wrong?

Solution 1

No.

let {Schema}, mongoose = require('mongoose');

it's same as

let {Schema};
let mongoose = require('mongoose');`

so it will not work because it's not exists object wherefrom take Schema .

let mongoose, {Schema} = require('mongoose');

it's same as

let mongoose;
let {Schema} = require('mongoose');`

And mongoose is really undefined.

Solution 2

For me it was because I was returning empty variables so I had to check their values. Make sure you're returning the right data.