How to implement multiple custom schema directives (visitSchemaDirectives) through utils package for v8 ?

[SidKhanna296]

Hi,
I am migrating graphql tools from v7 to v8 and need to update my custom schema directive.
I have a subgraph which uses multiple schema directive to implement different functionality (customDirective1, customDirective2 ...)

in my v7 implementation, I had:

const schema = buildSubgraphSchema([
        {
            typeDefs: getSchema(),
            resolvers,
        },
    ]);

    SchemaDirectiveVisitor.visitSchemaDirectives(schema, {
        directive1Name: customDirective1Func,
        directive2Name: customDirective2Func,
        ...
    });

const server = new ApolloServer({
        schema})

in the apollo and graphql/tools docs the example only highlights how to implement single custom directives for v8:

let schema = makeExecutableSchema({
  typeDefs,
  resolvers
});

// Transform the schema by applying directive logic
schema = schemaDirective1Func(schema, 'directive1Name');

My question becomes if I had multiple directives, what is considered the standard on implementing it or how would you implement it?

• I could add another line like this, but the below seems clunky
  schema = schemaDirective2Func(schema, 'directive2Name');

• Another thought I had was using a reducer
  [schemaDirective1Func(directive1Name), schemaDirective2Func(directive2Name)].reduce( (previousSchema, directive) => directive(previousSchema), schema)

Or Should I have my directives only have logic for what is used inside mapSchema - and call mapSchema before I initialize my server
with the second argument having an object of my directive function ?

• Or is the recommended pattern to just have all the transformers and typedefs mapped to a standard field and just call that ?
  i.e.:

const { schemaDirectiveTransformer: schemaDirective1FuncTransformer } = schemaDirective1Func('directive1Name')
const { schemaDirectiveTransformer: schemaDirective2FuncTransformer } = schemaDirective2Func('directive2Name')

schema = schemaDirectiveTransformer(schema);

^ https://www.graphql-tools.com/docs/schema-directives#examples

But was not sure if any of this is a recommended standard, if this would work or if there is a function that handles this similar logic like visitSchemaDirectives ?

[n1ru4l]

Duplicate of #3419