/**
 * `<appSettings>` values out of a .NET .config document (web.config,
 * SysTestConsole.exe.config).
 *
 * Only flat `<add key="…" value="…"/>` entries are ever read, so this stays a
 * small reader rather than a full XML parse — but it reads them as XML does:
 *   - commented-out entries do not count. A web.config routinely keeps the
 *     previous value in a comment next to the live one, and a reader that saw
 *     the comment first answered with the OLD host or database;
 *   - attribute order and quote style are free (`value="…" key="…"`,
 *     `key='…'`);
 *   - entities are decoded, so `a&amp;b` reads as `a&b`;
 *   - only entries inside `<appSettings>` count when the document has one —
 *     `<add>` is also the element of connectionStrings, handlers, modules and
 *     most other collections;
 *   - a key added twice takes its last value, as .NET's appSettings does.
 */
/** The value of one `<appSettings>` key, or undefined when no live entry sets it. */
export declare function readAppSetting(xml: string, key: string): string | undefined;
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