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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | /**
* Helpers for detecting a real browser document.
*
* MV3 service workers (and Node) have no `document`. Core crypto/fetch paths are SW-safe;
* UI-only helpers ({@link DownloadService}, OTP QR canvas rendering) must call these guards
* so they fail with a clear error instead of a cryptic `document is not defined`.
*/
export function isDocumentAvailable() {
return typeof document !== "undefined"
&& typeof document.createElement === "function";
}
/**
* Throws if `document` is not available (e.g. MV3 service worker / Node).
* @param feature Human-readable name of the DOM-only feature for the error message
*/
export function assertDocumentAvailable(feature) {
if (!isDocumentAvailable()) {
throw new Error(`${feature} requires a DOM (document) and cannot run in an MV3 service worker. ` +
`Call it from a page, popup, or offscreen document, or use the non-DOM API instead.`);
}
}
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