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