Get ethers.ContractInterface when calling contract.interface which is marked as ethers.utils.Interface

[EazyReal]

As subject,
The ethers version is 5.5.4

let abi: ethers.ContractInterface 
let address: string
let contract = new Contract(address, abi)
//... pass contract as prop to a Svelte component
let iface: Interface = contract.interface
iface instanceof ethers.utils.Interface //false

[EazyReal]

I looked at the source (master branch) it seems that the Contract contractor is converting the contractInterface to Interface

[ricmoo]

The ContractInterface is a type, so cannot be instantiated, in general; it just defines a "shape" as TypeScript calls it.

As for the example you give, that may depend on your environment and set up. For example, if you are using a bundler or npm link it will affect the reliability of instanceof.

This is why ethers doesn't use instanceof internally, because it is quite unreliable in a large variety of situations.

> contract.interface instanceof utils.Interface
true

Hope that helps.

[EazyReal]

The ContractInterface is a type, so cannot be instantiated, in general; it just defines a "shape" as TypeScript calls it.
As for the example you give, that may depend on your environment and set up.

I pass the contract as a prop to a Svelte component.
https://github.com/EazyReal/Sveth/blob/main/src/components/ContractCard.svelte#L12

For example, if you are using a bundler or npm link it will affect the reliability of instanceof.

Where can I learn more about these issues?

This is why ethers doesn't use instanceof internally, because it is quite unreliable in a large variety of situations.

> contract.interface instanceof utils.Interface
true

Hope that helps.

Yes, thanks!