```ts
export function matchSetting(rules: Record<string, string>, name: string): string | null {
  if (typeof name !== "string" || name === "" || name.includes("*")) {
    throw new Error("name must be a star-free non-empty string");
  }

  let result: [number, string] | null = null;

  for (const selector in rules) {
    const value = rules[selector];
    if (typeof value !== "string") {
      throw new Error("rule values must be strings");
    }

    if (selector === name) {
      return value;
    } else if (selector.endsWith(".*")) {
      const prefix = selector.slice(0, -2);
      if (name.startsWith(prefix)) {
        if (!result || result[0] < prefix.length) {
          result = [prefix.length, value];
        }
      }
    } else if (selector === "*") {
      result = ["*".length, value];
    }
  }

  return result ? result[1] : null;
}
```