src/vs/workbench/contrib/notebook/common/notebookCommon.ts/MimeTypeDisplayOrder/findIndex
class MimeTypeDisplayOrder:	private findIndex(mimeType: string, maxIndex = this.order.length) {
		const normalized = normalizeSlashes(mimeType);
		for (let i = 0; i < maxIndex; i++) {
			if (this.order[i].matches(normalized)) {
				return i;
			}
		}

		return -1;
	}