16 lines
447 B
JavaScript
16 lines
447 B
JavaScript
const invariant = (truthy, error) => {
|
|
if (!truthy) throw new Error(error);
|
|
};
|
|
|
|
export default function (context, selector) {
|
|
const cmService = context.owner.lookup('service:code-mirror');
|
|
|
|
const element = document.querySelector(selector);
|
|
invariant(element, `Selector ${selector} matched no elements`);
|
|
|
|
const cm = cmService.instanceFor(element.id);
|
|
invariant(cm, `No registered CodeMirror instance for ${selector}`);
|
|
|
|
return cm;
|
|
}
|