fix incorrect missing property reporting with ownProperties option, c…

…loses #1493

lib/vocabularies/code.ts

@@ -1,7 +1,7 @@
 import type {AnySchema, SchemaMap} from "../types"
 import type {SchemaCxt} from "../compile"
 import type KeywordCxt from "../compile/context"
-import {CodeGen, _, or, not, nil, strConcat, getProperty, Code, Name} from "../compile/codegen"
+import {CodeGen, _, and, or, not, nil, strConcat, getProperty, Code, Name} from "../compile/codegen"
 import {alwaysValidSchema} from "../compile/util"
 import {Type} from "../compile/subschema"
 import N from "../compile/names"
@@ -20,9 +20,8 @@ export function checkMissingProp(
   missing: Name
 ): Code {
   return or(
-    ...properties.map(
-      (prop) =>
-        _`${noPropertyInData(gen, data, prop, opts.ownProperties)} && (${missing} = ${prop})`
+    ...properties.map((prop) =>
+      and(noPropertyInData(gen, data, prop, opts.ownProperties), _`${missing} = ${prop}`)
     )
   )
 }
@@ -61,7 +60,7 @@ export function noPropertyInData(
   ownProperties?: boolean
 ): Code {
   const cond = _`${data}${getProperty(property)} === undefined`
-  return ownProperties ? _`${cond} || !${isOwnProperty(gen, data, property)}` : cond
+  return ownProperties ? or(cond, not(isOwnProperty(gen, data, property))) : cond
 }
 
 export function allSchemaProperties(schemaMap?: SchemaMap): string[] {

spec/errors.spec.ts

@@ -313,7 +313,7 @@ describe("Validation errors", () => {
       test(new _Ajv({$data: true}))
       test(new _Ajv({$data: true, allErrors: true}))
 
-      function test(_ajv) {
+      function test(_ajv: Ajv) {
         const schema = {
           type: "object",
           required: {$data: "0/req"},
@@ -348,6 +348,33 @@ describe("Validation errors", () => {
         )
       }
     })
+
+    it("should include missing property with ownProperties option (issue #1493)", () => {
+      test(new _Ajv())
+      test(new _Ajv({ownProperties: true}))
+
+      function test(_ajv: Ajv): void {
+        const schema = {
+          type: "object",
+          required: ["a"],
+          properties: {
+            a: {type: "string"},
+          },
+        }
+
+        const validate = _ajv.compile(schema)
+        shouldBeValid(validate, {a: "abc"})
+        shouldBeInvalid(validate, {})
+        shouldBeError(
+          validate.errors?.[0],
+          "required",
+          "#/required",
+          "",
+          "should have required property 'a'",
+          {missingProperty: "a"}
+        )
+      }
+    })
   })
 
   describe('"dependencies" errors', () => {