[yup] Added better definition for yup's SchemaDescription.fields (#40822)

* Added better definitions for SchemaDescription.fields

* indentation fix

types/yup/index.d.ts

@@ -351,12 +351,28 @@ export interface TestOptions<P extends Record<string, any> = {}, R = any> {
     exclusive?: boolean;
 }
 
+export interface SchemaFieldRefDescription {
+    type: 'ref';
+    key: string;
+}
+
+export interface SchemaFieldInnerTypeDescription extends Pick<
+    SchemaDescription, Exclude<keyof SchemaDescription, 'fields'>
+> {
+    innerType?: SchemaFieldDescription;
+}
+
+export type SchemaFieldDescription =
+    | SchemaDescription
+    | SchemaFieldRefDescription
+    | SchemaFieldInnerTypeDescription;
+
 export interface SchemaDescription {
     type: string;
     label: string;
     meta: object;
     tests: Array<{ name: string; params: object }>;
-    fields: object;
+    fields: Record<string, SchemaFieldDescription>;
 }
 
 // ValidationError works a lot more like a class vs. a constructor

types/yup/yup-tests.ts

@@ -449,7 +449,32 @@ const description: SchemaDescription = {
         { name: 'test1', params: {} },
         { name: 'test2', params: {} },
     ],
-    fields: { key: 'value' },
+    fields: {
+        refField: {
+            type: 'ref',
+            key: 'value',
+        },
+        noSubField: {
+            type: 'type',
+            label: 'label',
+            meta: { key: 'value' },
+            tests: [],
+        },
+        subField: {
+            type: 'type',
+            label: 'label',
+            meta: { key: 'value' },
+            tests: [],
+            fields: { key: { type: 'ref', key: 'value' } }
+        },
+        withInnerType: {
+            type: 'type',
+            label: 'label',
+            meta: { key: 'value' },
+            tests: [],
+            innerType: { type: 'ref', key: 'value' }
+        },
+     },
 };
 
 const testOptions: TestOptions = {