reportIfNightModeWasDisabledOnPage.js
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reportIfNightModeWasDisabledOnPage.js
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	/**
	* @private
	* @return {boolean}
	*/
	function reportDisabled() {
	mw.notify( mw.msg( 'skin-minerva-night-mode-unavailable' ) );
	return true;
	}

	/**
	* @ignore
	* @param {Document} doc
	* @return {boolean} whether it was reported as disabled.
	*/
	function reportIfNightModeWasDisabledOnPage( doc ) {
	if ( !doc.classList.contains( 'skin-night-mode-page-disabled' ) ) {
	return false;
	}
	// Cast to string.
	let userExpectedNightMode = `${ mw.user.options.get( 'minerva-theme' ) }`;
	if ( !mw.user.isNamed() ) {
	// bit more convoulated here and will break with upstream changes...
	// this is protected by an integration test in integration.test.js
	const cookieValue = mw.cookie.get( 'mwclientpreferences' ) \|\| '';
	const match = cookieValue.match( /skin-theme-clientpref-(\S+)/ );
	if ( match ) {
	// we found something in the cookie.
	userExpectedNightMode = match[ 1 ];
	}
	}
	if ( userExpectedNightMode === 'night' ) {
	return reportDisabled();
	} else if ( userExpectedNightMode === 'os' && matchMedia( '( prefers-color-scheme: dark )' ).matches ) {
	return reportDisabled();
	} else {
	return false;
	}
	}

	module.exports = reportIfNightModeWasDisabledOnPage;