fix(v2+v3-ts): add type declaration for sharedManifest (#39)

Author: samrum

index.js

@@ -327,6 +327,10 @@ const pkg = JSON.parse(readFileSync(new URL("./../package.json", import.meta.url
                   : "chrome.runtime.ManifestV3"
               } {`
             )
+            .replace(
+              `const sharedManifest`,
+              `const sharedManifest: Partial<chrome.runtime.ManifestBase>`
+            )
             .replace(
               `getManifest(manifestVersion) {`,
               `getManifest(manifestVersion: number): chrome.runtime.ManifestV2 | chrome.runtime.ManifestV3 {`