setComponentTemplate is run twice on decorated classes

[davidtaylorhq]

Given an Ember component definition like this:

// components/my-component.js

import Component from '@glimmer/component';

const myDecorator = (klass) => klass;

@myDecorator
export default class MyComponent extends Component {}

and a colocated template:

{{! components/my-component.hbs }}
Hello world

The transpiled output looks something like this:

const myDecorator = klass=>klass;
const MyComponent = dt7948.c(class MyComponent extends _glimmer_component__WEBPACK_IMPORTED_MODULE_0__["default"] {
}
, [myDecorator]);
/* harmony default export */
const __WEBPACK_DEFAULT_EXPORT__ = ((0,
_ember_component__WEBPACK_IMPORTED_MODULE_2__.setComponentTemplate)(_my_component_hbs__WEBPACK_IMPORTED_MODULE_1__["default"], MyComponent));
(0,
_ember_component__WEBPACK_IMPORTED_MODULE_2__.setComponentTemplate)(_my_component_hbs__WEBPACK_IMPORTED_MODULE_1__["default"], MyComponent);

Note the duplicate calls to setComponentTemplate. This causes a runtime error

Uncaught Error: Cannot call `setComponentTemplate` multiple times on the same class (`MyComponent`)

Minimal reproduction here: davidtaylorhq/decorator-transform-test@d01d5c4

Potential fix here: #18

[ef4]

I think this is fixed via embroider-build/embroider#1758