add tests for optional implicit and implicit.left

mdjermanovic · mdjermanovic · commit c44db85bc9a5 · 2025-05-29T17:22:42.000+02:00
diff --git a/tests/lib/languages/js/source-code/source-code.js b/tests/lib/languages/js/source-code/source-code.js
@@ -3756,5 +3756,65 @@ describe("SourceCode", () => {
 				["Foo", "Foo"],
 			);
 		});
+
+		it("should not crash if global scope doesn't have `implicit` property", () => {
+			const code = "Array = 1; Foo = 1; Promise = 1; Array; Foo; Promise";
+			const ast = espree.parse(code, DEFAULT_CONFIG);
+			const scopeManager = eslintScope.analyze(ast, {
+				ignoreEval: true,
+				ecmaVersion: 6,
+			});
+
+			const globalScope = scopeManager.scopes[0];
+			delete globalScope.implicit;
+
+			const sourceCode = new SourceCode({
+				text: code,
+				ast,
+				scopeManager,
+			});
+
+			sourceCode.applyLanguageOptions({
+				ecmaVersion: 2015,
+			});
+
+			// should not throw
+			sourceCode.finalize();
+		});
+
+		it("should not crash if global scope doesn't have `implicit.left` property", () => {
+			const code = "Array = 1; Foo = 1; Promise = 1; Array; Foo; Promise";
+			const ast = espree.parse(code, DEFAULT_CONFIG);
+			const scopeManager = eslintScope.analyze(ast, {
+				ignoreEval: true,
+				ecmaVersion: 6,
+			});
+			const sourceCode = new SourceCode({
+				text: code,
+				ast,
+				scopeManager,
+			});
+
+			const globalScope = sourceCode.scopeManager.scopes[0];
+			delete globalScope.implicit.left;
+
+			sourceCode.applyLanguageOptions({
+				ecmaVersion: 2015,
+			});
+
+			// should not throw
+			sourceCode.finalize();
+
+			const { implicit } = globalScope;
+
+			assert.deepStrictEqual(
+				[...implicit.set].map(([name]) => name),
+				["Foo"],
+			);
+			assert.deepStrictEqual(
+				implicit.variables.map(({ name }) => name),
+				["Foo"],
+			);
+		});
 	});
 });
