refac: improve multi browser support

lib/createManifest.ts

@@ -0,0 +1,33 @@
+import type { Browser, BuildTarget, Manifest } from './types'
+import type { AnyCase } from './utils'
+/**
+ *
+ *
+ * @export
+ * @param {Manifest} manifest
+ * @param {AnyCase<Browser>} browser
+ * @return {*}  {@link BuildTarget}
+ */
+export function createManifest(
+  manifest: Manifest,
+  browser: AnyCase<Browser>,
+): BuildTarget {
+  return {
+    manifest,
+    browser,
+  }
+}
+
+/**
+ * create a base Manifest to inherit from
+ * type Manifest = chrome.runtime.ManifestV3
+ *
+ * use as shared base to extend inBrowser manifests
+ *
+ * @export
+ * @param {Manifest} manifest
+ * @return {*}  {@link Manifest}
+ */
+export function createManifestBase(manifest: Manifest): Manifest {
+  return manifest
+}