const swc = require('../../../'); it("should handle es2019", () => { expect( swc.transformSync(`class SomeClass { someMethod() {} } class OtherClass extends SomeClass { anotherMethod() { super.someMethod() } }`, { jsc: { parser: { syntax: "ecmascript", }, target: "es2019", } }) .code.trim() ).toContain(`class `); });