Cast the directive types

packages/api/src/apollo.ts

@@ -110,7 +110,7 @@ const contextFunc: ContextFunction<ExpressContext, ResolverContext> = async ({
 export function makeApolloServer(app: Express): ApolloServer {
   let schema = makeExecutableSchema({
     resolvers,
-    typeDefs
+    typeDefs,
   })
 
   schema = sanitizeDirectiveTransformer(schema)

packages/api/src/directives.ts

@@ -5,25 +5,31 @@ import { SanitizedString } from './scalars'
 export const sanitizeDirectiveTransformer = (schema: GraphQLSchema) => {
   return mapSchema(schema, {
     [MapperKind.FIELD]: (fieldConfig) => {
-      const sanitizeDirective = getDirective(
-        schema,
-        fieldConfig,
-        'sanitize'
-      )
+      const sanitizeDirective = getDirective(schema, fieldConfig, 'sanitize')
       if (!sanitizeDirective || sanitizeDirective.length < 1) {
         return fieldConfig
       }
 
-      const maxLength = sanitizeDirective[0].maxLength
-      const allowedTags = sanitizeDirective[0].allowedTags
+      const maxLength = sanitizeDirective[0].maxLength as number | undefined
+      const allowedTags = sanitizeDirective[0].allowedTags as
+        | string[]
+        | undefined
 
-      if (fieldConfig.type instanceof GraphQLNonNull && fieldConfig.type.ofType instanceof GraphQLScalarType) {
+      if (
+        fieldConfig.type instanceof GraphQLNonNull &&
+        fieldConfig.type.ofType instanceof GraphQLScalarType
+      ) {
         fieldConfig.type = new GraphQLNonNull(
           new SanitizedString(fieldConfig.type.ofType, allowedTags, maxLength)
         )
       } else if (fieldConfig.type instanceof GraphQLScalarType) {
-        fieldConfig.type = new SanitizedString(fieldConfig.type, allowedTags, maxLength)
+        fieldConfig.type = new SanitizedString(
+          fieldConfig.type,
+          allowedTags,
+          maxLength
+        )
       } else {
+        // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
         throw new Error(`Not a scalar type: ${fieldConfig.type}`)
       }
       return fieldConfig