Fix array-like params in CDS functions/actions (#363)

`array of` needs to be supported as well:

```cds
function check(
    param_2: Array of String not null
) returns ...
```

Explaining comment is
[here](#332 (comment)).

---------

Co-authored-by: Christian Georgi <[email protected]>

Author: siarhei-murkou

CHANGELOG.md

@@ -12,6 +12,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 ### Fixed
 - Entity elements of named structured types are flattened when using the option `--inlineDeclarations flat`
+- Properly support mandatory (`not null`) action parameters with `array of` types
 
 ## Version 0.27.0 - 2024-10-02
 ### Changed

lib/resolution/resolver.js

@@ -65,7 +65,7 @@ class Resolver {
      * @returns {boolean} whether the type is configured to be optional
      */
     isOptional(type) {
-        return !type.notNull
+        return type.items ? !type.items.notNull : !type.notNull
     }
 
     /**

test/unit/actions.test.js

@@ -178,7 +178,7 @@ describe('Actions', () => {
 
     test ('Optional Action Params', async () => {
         checkFunction(astwBound.tree.find(fn => fn.name === 'aMandatoryParam'), {
-            parameterCheck: ({members: [p1, p2, p3]}) => !check.isOptional(p1) && check.isOptional(p2) && !check.isOptional(p3),
+            parameterCheck: ({members: [p1, p2, p3]}) => !check.isOptional(p1) && !check.isOptional(p2) && check.isOptional(p3),
         })
     })
 

test/unit/files/actions/model.cds

@@ -34,9 +34,9 @@ service S {
     action   aManyParamSingleReturn(val: array of E) returns E;
 
     action   aMandatoryParam(
-        val: E not null,
+        val1: E not null,
+        val2: array of E not null,
         opt: E,
-        val2: E not null
     ) returns E;
 
     /** the action */

test/unit/files/actions/model.ts

@@ -49,7 +49,7 @@ export class S extends cds.ApplicationService { async init(){
   this.on(aManyParamSingleReturn,    req => { const {val} = req.data; return {e1:val[0].e1} satisfies E })
 
   this.on(aMandatoryParam,  req => {
-    false satisfies IsKeyOptional<typeof req.data, 'val'>
+    false satisfies IsKeyOptional<typeof req.data, 'val1'>
     false satisfies IsKeyOptional<typeof req.data, 'val2'>
     true satisfies IsKeyOptional<typeof req.data, 'opt'>
   })