minField only works with scalar

[kefniark]

Description

Earlier I was trying to use Array/List constraints but run into a problem. It works with scalar but not with objects.

input TestInput {
  id: ID!
  arrInt: [Int!] @constraint(minLength: 1) # works
  arrString: [String!] @constraint(minLength: 1) # works
  arrObj: [TestInputObj!] @constraint(minLength: 1) # doesn't work, crash
}

The documentation is not really clear if it's a design limitation, nothing specific it should only works on list of scalar.

Stacktrace

TypeError: Cannot read properties of undefined (reading 'toString')
    at getScalarType (/app/node_modules/graphql-constraint-directive/lib/type-utils.js:52:61)
    at getScalarType (/app/node_modules/graphql-constraint-directive/lib/type-utils.js:50:17)
    at getScalarType (/app/node_modules/graphql-constraint-directive/lib/type-utils.js:46:17)
    at wrapType (/app/node_modules/graphql-constraint-directive/index.js:64:20)
    at MapperKind.FIELD (/app/node_modules/graphql-constraint-directive/index.js:82:11)
    at mapFields (/app/node_modules/graphql-constraint-directive/node_modules/@graphql-tools/utils/cjs/mapSchema.js:144:37)
    at mapSchema (/app/node_modules/graphql-constraint-directive/node_modules/@graphql-tools/utils/cjs/mapSchema.js:10:37)
    at /app/node_modules/graphql-constraint-directive/index.js:77:5
    at eval (/app/apps/api/src/schema/index.ts:81:89)