typescript use in react-native const undefined

Question

I have a typescript:

export const create= () => {
   export const  Size = 5;

   export const now = () => {
    const bytes = new Uint8Array(this.Size); 
   }
}

The code runs fine in node.js application, but when I try to use it in react-native, I get:

Cannot read property 'Size' of undefined

Obviously when converted to javascript to be used in react-native:

exports.Size = 5;

user6269864 · Accepted Answer · 2019-07-15 07:15:34Z

1

You don't need to mark Size and now with export.
Arrow functions don't have a this. They are using the this from the function or class above them. Basically, just use Size instead of this.Size.

Unrelated, but you may want to look at AirBnb styleguide for how to write good code.

answered Jul 15, 2019 at 7:15

user6269864

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