Graphql-yoga: What's the underscore _ parameter in the resolver function signature?

[lukehedger]

Couldn't find any info on the underscore parameter seen in the examples and is undefined when logged.

What's it for?

const resolvers = {
  Query: {
    hello: (_, { name }) => `Hello ${name || 'World'}`,
  },
}

[kbrandwijk]

It's a placeholder for parent. In field-level resolvers, it contains the results of the parent resolver.
The full signature for a resolver function is (parent, args, context, info) => {}

[lukehedger]

Ah gotcha - thanks @kbrandwijk, makes sense!