Using the effects API, how to define an optional return type for the output?

[PaulRBerg]

Following @DZakh's advice here, I proceeded to use the new context.effects API, and I defined this output:

const ERC20MetadataOutput = {
  decimals: S.number,
  name: S.string,
  symbol: S.string,
};

Now, the question is, how can I make the entire output optional?

I tried this:

const ERC20MetadataOutput = S.optional({
  decimals: S.number,
  name: S.string,
  symbol: S.string,
});

And this:

const ERC20MetadataOutput = S.nullable(S.object({
  decimals: S.number,
  name: S.string,
  symbol: S.string,
});

But neither approach worked.

[DZakh]

You need to use S.schema the same way you tried to use S.object.

[PaulRBerg]

Thanks. This worked:

const output = S.schema({
  decimals: S.number,
  name: S.string,
  symbol: S.string,
});
S.optional(output);

[DZakh]

It currently uses https://github.com/DZakh/sury v9.3.0 under the hood. You can find more information in the library docs.