Improve input validation with visitor (#26)

* initial implementation of visitor

* additional features

Co-authored-by: Adam Petro <[email protected]>

* additional test fixtures

* clean up new files

* remove old files, rename new files in their place

* remove package-lock, prefer pnpm-lock

* move workspaces to pnpm-workspace

* comment for isInputType + coerceInputValue on output types.

* flattenNestedArrays

* missing js-docs

* inline data for tests for validateFixtureInput

* clean up test fixtures

* use it.skip for unsupported test cases

* remove `valid` on validation return types. Rely on errors.length instead.

* improve comment for flattenNestedArrays

* remove redundant continues

* use pnpm workspaces for test-app/extensions deps

* rework nestedArray traversing to handle nulls.

* clean up test

* use toHaveLength

* better type for processNestedArrays arg value

---------

Co-authored-by: Adam Petro <[email protected]>

Author: lopert

.npmrc

@@ -0,0 +1,2 @@
+public-hoist-pattern[]=*@graphql-codegen/*
+public-hoist-pattern[]=graphql-code-generator

dev.yml

@@ -0,0 +1,9 @@
+name: shopify-function-test-helpers
+
+type:
+  - node
+
+up:
+  - node:
+      version: 24.1.0
+      package_manager: [email protected]