fix: typed result and similar (#509)

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### Describe your change

Fixes datetime return type by returning the `value` field instead of the
whole object.

### Motivation and context

Prisma has a `$type` tag for formatted string such as `DateTime`, this
PR aims to add support for that.

### Migration notes

<!-- Explain HOW users should update their code when required -->

### Checklist

- [ ] The change come with new or modified tests
- [x] Hard-to-understand functions have explanatory comments
- [ ] End-user documentation is updated to reflect the change

.pre-commit-config.yaml

@@ -17,12 +17,12 @@ repos:
         # exclude all generated files
         exclude: (typegate/deno.lock|.*\.snap$|typegate/src/typegraphs/.*\.json|website/docs/reference/)
   - repo: https://github.com/python-jsonschema/check-jsonschema
-    rev: 0.27.1
+    rev: 0.27.2
     hooks:
       - id: check-dependabot
       - id: check-github-workflows
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: "v0.1.6"
+    rev: "v0.1.7"
     hooks:
       - id: ruff
       - id: ruff-format

typegate/src/runtimes/prisma/prisma.ts

@@ -269,10 +269,28 @@ export class PrismaRuntime extends Runtime {
       } else {
         const resolver: Resolver = ({ _: { parent } }) => {
           const resolver = parent[field.props.node];
-          const ret = typeof resolver === "function" ? resolver() : resolver;
+          const rawValue = typeof resolver === "function"
+            ? resolver()
+            : resolver;
           const matData = stage.props.materializer
             ?.data as unknown as PrismaOperationMatData;
-          return matData.operation === "queryRaw" ? ret["prisma__value"] : ret;
+
+          // if queryRaw is used, the result has a type tag
+          const ret = matData.operation === "queryRaw"
+            ? rawValue["prisma__value"]
+            : rawValue;
+
+          // Prisma uses $type tag for formatted strings
+          // eg. `createAt: { "$type": "DateTime", value: "2023-12-05T14:10:21.840Z" }`
+          if (
+            !Array.isArray(ret) &&
+            typeof ret === "object" &&
+            ret !== null &&
+            "$type" in ret // !
+          ) {
+            return ret?.["value"] ?? ret;
+          }
+          return ret;
         };
         stagesMat.push(
           new ComputeStage({