feat(config): add helper for loading kit config in the case where package.json has been parsed already (#3492)

* add helper for loading kit config when package.json has already been parsed

* docs(changeset): Add helper to load the kit config from an already parsed package.json file

* add export for new helper (missed when xferring change over)

* renamed getKitConfigFromPackageJson to getKitConfigFromPackageManifest

Author: JasonVMo

.changeset/cuddly-carrots-carry.md

@@ -0,0 +1,5 @@
+---
+"@rnx-kit/config": patch
+---
+
+Add helper to load the kit config from an already parsed package.json file

packages/config/src/getKitConfig.ts

@@ -69,3 +69,16 @@ export function getKitConfig(
     return undefined;
   }
 }
+
+/**
+ * Helper for loading the KitConfig for cases where the package.json has already been loaded for other reasons.
+ * @param packageJson The loaded and parsed package.json file for this package.
+ * @param packageDir The directory containing the package.json file.
+ * @returns The rnx-kit configuration for this package, merged with any base configuration.
+ */
+export function getKitConfigFromPackageManifest(
+  packageJson: PackageManifest,
+  packageDir: string
+): KitConfig | undefined {
+  return loadBaseConfig(packageJson["rnx-kit"], packageDir);
+}

packages/config/src/index.ts

@@ -11,7 +11,7 @@ export { getBundleConfig, getPlatformBundleConfig } from "./getBundleConfig";
 export { getKitCapabilities } from "./getKitCapabilities";
 export type { KitCapabilities } from "./getKitCapabilities";
 
-export { getKitConfig } from "./getKitConfig";
+export { getKitConfig, getKitConfigFromPackageManifest } from "./getKitConfig";
 export type { GetKitConfigOptions } from "./getKitConfig";
 
 export type {