20 lines
634 B
TypeScript
20 lines
634 B
TypeScript
|
/**
|
||
|
|
* Try to extract the list of themes from a theme selector on the page. This
|
||
|
|
* will return undefined when no theme selector is available. The returned array
|
||
|
|
* will be tuples where the first item is the theme value from the `<option>`
|
||
|
|
* element and the second item being the theme display name.
|
||
|
|
*/
|
||
|
|
export function extractThemes(): Array<[string, string]> | undefined {
|
||
|
|
const themes = document.querySelectorAll<HTMLOptionElement>(
|
||
|
|
"select#theme option",
|
||
|
|
);
|
||
|
|
if (themes.length === 0) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
return Array.from(themes).map((theme) => [
|
||
|
|
theme.value,
|
||
|
|
(theme.textContent ?? "<unknown>").trim(),
|
||
|
|
]);
|
||
|
|
}
|