JSONObject: Unexpected error if literal is not an object

[tjenkinson]

Issue workflow progress

Progress of the issue based on the Contributor Workflow

• 1. The issue provides a reproduction available on GitHub, Stackblitz or CodeSandbox

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• 2. A failing test has been provided
• 3. A local solution has been provided
• 4. A pull request is pending review: fix(JSONObject): Throw proper error if literal is not an object #2284

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Describe the bug
Currently if you provide a param that should be a JSONObject but it is not an object the error is not handled nicely.

To Reproduce
Add a JSONObject param and do something like

query {
   accounts(myArg: "Not an object") {
   }
}

Expected behavior
A nice error message

Actual behaviour

Expected value of type \"JSONObject\", found \"Not an object\"; Cannot read properties of undefined (reading 'forEach')

Environment:

• OS: Mac
• GraphQL Scalars Version: 1.22.5
• NodeJS: Cloudflare worker