feat(src): add if-merge logic

src/if-merge/index.ts

@@ -0,0 +1,33 @@
+#!/usr/bin/env node
+/* eslint-disable no-process-exit */
+import {debugLogger} from '../common/util/debug-logger';
+import {logger} from '../common/util/logger';
+
+import {parseIfMergeArgs} from './util/args';
+import {mergeManifests} from './util/helpers';
+
+import {STRINGS} from './config';
+
+const {MERGING, SUCCESS_MESSAGE} = STRINGS;
+
+const IfMerge = async () => {
+  // Call this function with false parameter to prevent log debug messages.
+  debugLogger.overrideConsoleMethods(false);
+
+  const commandArgs = await parseIfMergeArgs();
+
+  console.log(`${MERGING}\n`);
+
+  await mergeManifests(commandArgs);
+
+  console.log(SUCCESS_MESSAGE);
+
+  process.exit(0);
+};
+
+IfMerge().catch(error => {
+  if (error instanceof Error) {
+    logger.error(error);
+    process.exit(2);
+  }
+});