chore: workiing on base

packages/webpack5/src/index.ts

@@ -1 +1,55 @@
 export * from './configuration';
+import { existsSync } from "fs";
+import { getPackageJson } from './helpers/projectHelpers';
+import { resolve } from "path";
+
+
+export type Platform = 'android' | 'ios';
+/**
+ * Function to ensure the app directory exists
+ *
+ * @param appDirectory
+ */
+function verifyEntryModuleDirectory(appDirectory: string) {
+    if (!appDirectory) {
+        throw new Error("Path to app directory is not specified. Unable to find entry module.");
+    }
+
+    if (!existsSync(appDirectory)) {
+        throw new Error(`The specified path to app directory ${appDirectory} does not exist. Unable to find entry module.`);
+    }
+}
+
+function getPackageJsonEntry(appDirectory) {
+    const packageJsonSource = getPackageJson(appDirectory);
+    const entry = packageJsonSource.main;
+
+    if (!entry) {
+        throw new Error(`${appDirectory}/package.json must contain a 'main' attribute!`);
+    }
+
+    return entry.replace(/\.js$/i, "");
+}
+
+
+export function getEntryModule  (appDirectory: string, platform: 'android' | 'ios') {
+    verifyEntryModuleDirectory(appDirectory);
+
+    const entry = getPackageJsonEntry(appDirectory);
+
+    const tsEntryPath = resolve(appDirectory, `${entry}.ts`);
+    const jsEntryPath = resolve(appDirectory, `${entry}.js`);
+    let entryExists = existsSync(tsEntryPath) || existsSync(jsEntryPath);
+    if (!entryExists && platform) {
+        const platformTsEntryPath = resolve(appDirectory, `${entry}.${platform}.ts`);
+        const platformJsEntryPath = resolve(appDirectory, `${entry}.${platform}.js`);
+        entryExists = existsSync(platformTsEntryPath) || existsSync(platformJsEntryPath);
+    }
+
+    if (!entryExists) {
+        throw new Error(`The entry module ${entry} specified in ` +
+            `${appDirectory}/package.json doesn't exist!`)
+    }
+
+    return entry;
+};