fix: don't stub every field when a mapper type is unresolvable

[GlebYavorski]

Summary

Fixes #446.

When a mapper aliases a type whose import cannot be resolved (a TypeScript error type — e.g. a Prisma/generated client that hasn't been generated yet, or a module not installed on a fresh checkout), fixObjectTypeResolvers ('smart' and 'fast') treated the mapper as having zero fields and injected a resolver is required because … does not stub for every field of the schema type. This silently overwrites hand-maintained resolver files with stubs that return Promise<void> and break tsc.

Root cause

getNodePropertyMap derives the mapper's properties from node.getType().getProperties(), which returns [] for an error type. The generator couldn't tell "mapper genuinely has no fields" apart from "mapper type could not be resolved", so every field took the if (!mapperProperty) branch and got a stub.

Fix

• Add isNodeTypeUnresolved, which detects the TypeScript error type (intrinsic type named error). This is distinct from a real any (intrinsicName === 'any') and from an empty object type (not an intrinsic type at all), so it does not misfire on those.
• In both the smart and fast paths, when the mapper's declaration node is unresolved, skip stub generation for that mapper (leaving existing resolvers untouched) and emit a logger.warn naming the mapper, so the real problem — the unresolved import — surfaces.
• Genuinely empty mappers (type FooMapper = {}) still generate stubs as before.

Tests

• Unit tests for isNodeTypeUnresolved covering: unresolvable import → true; empty {} → false; explicit any → false; resolved import → false; undefined node → false.
• Integration tests for getGraphQLObjectTypeResolversToGenerate (both smart and fast): an unresolvable mapper produces no stubs and warns once; a genuinely empty mapper still stubs every field and does not warn.

nx test/lint/build typescript-resolver-files all pass. Existing e2e snapshots are unaffected (behavior only changes for unresolvable mappers, which no fixture has).

A changeset (patch) is included.

[changeset-bot]

🦋 Changeset detected

Latest commit: c61e9f2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@eddeee888/gcg-typescript-resolver-files	Patch

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[eddeee888]

Thank you @GlebYavorski !
I'll look to release this soon