Resolve generic constraints like other types

Author: michaldudak

src/models/types/typeParameter.ts

@@ -6,7 +6,7 @@ export class TypeParameterNode implements TypeNode {
 	constructor(
 		public name: string,
 		public parentNamespaces: string[],
-		public constraint: string | undefined,
+		public constraint: TypeNode | undefined,
 		public defaultValue: TypeNode | undefined,
 	) {}
 }

src/parsers/typeResolver.ts

@@ -75,10 +75,14 @@ export function resolveType(
 	try {
 		if (type.flags & ts.TypeFlags.TypeParameter && type.symbol) {
 			const declaration = type.symbol.declarations?.[0] as ts.TypeParameterDeclaration | undefined;
+			const constraintType = declaration?.constraint
+				? checker.getBaseConstraintOfType(type)
+				: undefined;
+
 			return new TypeParameterNode(
 				type.symbol.name,
 				namespaces,
-				declaration?.constraint?.getText(),
+				constraintType ? resolveType(constraintType, undefined, context) : undefined,
 				declaration?.default
 					? resolveType(checker.getTypeAtLocation(declaration.default), undefined, context)
 					: undefined,

test/conditional-types/output.json

@@ -15,7 +15,11 @@
 									"kind": "typeParameter",
 									"name": "T",
 									"parentNamespaces": [],
-									"constraint": "boolean"
+									"constraint": {
+										"kind": "intrinsic",
+										"parentNamespaces": [],
+										"intrinsic": "boolean"
+									}
 								},
 								"name": "x",
 								"optional": false

test/generics/output.json

@@ -22,7 +22,13 @@
 												"kind": "typeParameter",
 												"name": "T",
 												"parentNamespaces": [],
-												"constraint": "React.HTMLAttributes<HTMLElement>"
+												"constraint": {
+													"kind": "reference",
+													"name": "HTMLAttributes<HTMLElement>",
+													"parentNamespaces": [
+														"React"
+													]
+												}
 											},
 											"optional": false
 										},
@@ -67,7 +73,13 @@
 							"kind": "typeParameter",
 							"name": "T",
 							"parentNamespaces": [],
-							"constraint": "React.HTMLAttributes<HTMLElement>"
+							"constraint": {
+								"kind": "reference",
+								"name": "HTMLAttributes<HTMLElement>",
+								"parentNamespaces": [
+									"React"
+								]
+							}
 						}
 					}
 				]

test/mui-overridable-component/output.json

@@ -16,7 +16,13 @@
 									"kind": "typeParameter",
 									"name": "RootComponent",
 									"parentNamespaces": [],
-									"constraint": "React.ElementType"
+									"constraint": {
+										"kind": "reference",
+										"name": "ElementType<any, keyof IntrinsicElements>",
+										"parentNamespaces": [
+											"React"
+										]
+									}
 								},
 								{
 									"kind": "intrinsic",