在express.js中定义常量

Question

I want to declare a key value objects in constant file and then import them. So, this is what I wrote:

let ACCEPTABLE_LANGUAGES = 
    [
        'eng' : {'wahid'},
    ];

export default {
    ACCEPTABLE_LANGUAGES : ACCEPTABLE_LANGUAGES
}

I am importing it: import common_constants from '../common_constants'; and using as follows:

console.log(common_constants.ACCEPTABLE_LANGUAGES);

But the declaration of ACCEPTABLE_LANGUAGES gives me error like:

Unexpected token, expected : (3:18)
  1 | let ACCEPTABLE_LANGUAGES = 
  2 |   [
> 3 |       'eng' : {'wahid'},
    |                       ^
  4 |   ];

I want to make it object not array. Why I am getting the issue?

Answer 1

Problem lies here: 'eng' : {'wahid'} . In javascript {} is called an object literal. So, an object by definition should have a key and value. Also, Array will not have key and pair, which you are doing in your example. You can do it like below:

let ACCEPTABLE_LANGUAGES = 
    [
        { 'eng': 'wahid'},
    ];

export default {
    ACCEPTABLE_LANGUAGES: ACCEPTABLE_LANGUAGES
}

Now, ACCEPTABLE_LANGUAGES is array of object.