fix(schema): handle `$schema` in config and elements

in case the user manually have to specify url/path to schema

src/meta/table.spec.ts

@@ -32,6 +32,7 @@ jest.mock(
 import { Config } from "../config";
 import { UserError } from "../error/user-error";
 import { Parser } from "../parser";
+import { MetaDataTable } from "./element";
 import { MetaData, MetaTable } from ".";
 
 class ConfigMock extends Config {
@@ -75,6 +76,19 @@ describe("MetaTable", () => {
 		);
 	});
 
+	it("should ignore $schema property", () => {
+		expect.assertions(2);
+		const table = new MetaTable();
+		table.loadFromObject(({
+			$schema: "https://example.net/schema.json",
+			foo: {
+				flow: true,
+			},
+		} as unknown) as MetaDataTable);
+		expect(table.getMetaFor("foo")).toBeDefined();
+		expect(table.getMetaFor("$schema")).toBeNull();
+	});
+
 	describe("getMetaFor", () => {
 		let table: MetaTable;
 

src/meta/table.ts

@@ -92,6 +92,7 @@ export class MetaTable {
 		}
 
 		for (const key of Object.keys(obj)) {
+			if (key === "$schema") continue;
 			this.addEntry(key, obj[key]);
 		}
 	}

src/schema/config.json

@@ -6,6 +6,10 @@
   "type": "object",
   "additionalProperties": false,
   "properties": {
+    "$schema": {
+      "type": "string"
+    },
+
     "root": {
       "type": "boolean",
       "title": "Mark as root configuration",

src/schema/elements.json

@@ -4,6 +4,13 @@
   "version": "1.0",
 
   "type": "object",
+
+  "properties": {
+    "$schema": {
+      "type": "string"
+    }
+  },
+
   "patternProperties": {
     "^.*$": {
       "type": "object",
@@ -44,7 +51,7 @@
         "requiredAncestors": { "$ref": "#/definitions/RequiredAncestors" },
         "requiredContent": { "$ref": "#/definitions/RequiredContent" }
       },
-      "additionalProperties": false
+      "additionalProperties": true
     }
   },