fix(schema): honor patternProperties value schema for object maps

packages/quicktype-core/src/input/JSONSchemaInput.ts

@@ -1139,14 +1139,19 @@ async function addTypesInSchema(
             }
 
             let additionalProperties = schema.additionalProperties;
-            // This is an incorrect hack to fix an issue with a Go->Schema generator:
-            // https://github.com/quicktype/quicktype/issues/976
             if (
-                additionalProperties === undefined &&
+                (additionalProperties === undefined ||
+                    additionalProperties === false) &&
                 typeof schema.patternProperties === "object" &&
-                hasOwnProperty(schema.patternProperties, ".*")
+                schema.patternProperties !== null &&
+                !Array.isArray(schema.patternProperties)
             ) {
-                additionalProperties = schema.patternProperties[".*"];
+                const patternSchemas = Object.values(schema.patternProperties);
+                if (patternSchemas.length === 1) {
+                    additionalProperties = patternSchemas[0];
+                } else if (patternSchemas.length > 1) {
+                    additionalProperties = { anyOf: patternSchemas };
+                }
             }
 
             // Handle unevaluatedProperties if additionalProperties is not defined

test/inputs/schema/pattern-properties-value.1.fail.json

@@ -0,0 +1,8 @@
+{
+    "materials": {
+        "steel": {
+            "roughness": "smooth",
+            "thickness": "not-a-number"
+        }
+    }
+}

test/inputs/schema/pattern-properties-value.1.json

@@ -0,0 +1,8 @@
+{
+    "materials": {
+        "steel": {
+            "roughness": "smooth",
+            "thickness": 1.5
+        }
+    }
+}

test/inputs/schema/pattern-properties-value.schema

@@ -0,0 +1,22 @@
+{
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+        "materials": {
+            "type": "object",
+            "patternProperties": {
+                "^.*\\S.*$": {
+                    "type": "object",
+                    "additionalProperties": false,
+                    "properties": {
+                        "roughness": { "type": "string" },
+                        "thickness": { "type": "number" }
+                    },
+                    "required": ["roughness", "thickness"]
+                }
+            },
+            "additionalProperties": false
+        }
+    },
+    "required": ["materials"]
+}

test/languages.ts

@@ -55,6 +55,7 @@ const skipsUntypedUnions = [
 // schema whose fail sample relies on rejecting a mistyped map value.
 const skipsMapValueValidation = [
     "go-schema-pattern-properties.schema",
+    "pattern-properties-value.schema",
     "unevaluated-properties.schema",
 ];