Trying to enhance an existing interface with a new member is causing Typescript errors for me.
// foo.js
export interface IOption {
xOffset: number
}
import {IOption} from 'foo';
// Attempting to extend IOption with `yOffset`, but encountered an error.
// Received the message: `Import declaration conflicts with local declaration of 'IOptions'`
interface IOption {
yOffset: number
}
Can anyone explain what's going wrong in my code?
It is important to properly declare the interface within the module.
import {IOption} from 'bar';
declare module 'bar' {
interface IOption {
xOffset: number
}
}
Expanding upon an existing interface isn't possible, however, a workaround is to create a new one with the same name by employing a clever technique:
import * as bar from 'bar';
interface ICustomOption extends bar.IOptions {
xOffset: number
}
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