docs: add JSDoc comments to resolveConfig and loadConfig functions

src/utils/configLoader.ts

@@ -8,6 +8,11 @@ export type ResolvedConfig = { [P in keyof Config]-?: Config[P] } & {
   [RESOLVED_CONFIG_SYMBOL]: true
 }
 
+/**
+ * Resolves a config, marking it with a special symbol.
+ * @param {Config | ResolvedConfig} config - The config to resolve.
+ * @returns {ResolvedConfig} The resolved config.
+ */
 export function resolveConfig(
   config?: Config | ResolvedConfig
 ): ResolvedConfig {
@@ -27,8 +32,14 @@ export function resolveConfig(
   return _config
 }
 
+/**
+ * Loads a config from a directory, with optional overrides.
+ * @param {string} dir - The directory to load the config from. Defaults to the current directory.
+ * @param {Config} overrides - Config values to override.
+ * @returns {Promise<ResolvedConfig>} The loaded and resolved config.
+ */
 export async function loadConfig(
-  dir = '.',
+  dir: string = '.',
   overrides: Config
 ): Promise<ResolvedConfig> {
   const { loadConfig } = await import('c12')