fix(rspack): move main validation to implementation (#28794)

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## Current Behavior
<!-- This is the behavior we have today -->
We currently have validation for the `main` property in the `executor`
schema, however, this value could be defined in the `rspack.config`
file.
This can cause an inaccurate schema validation error

## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
After loading the config file and applying the executor options, run
validation over the config.

## Related Issue(s)
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merged. -->

Fixes #

docs/generated/packages/rspack/executors/rspack.json

@@ -155,7 +155,7 @@
         "description": "Generates a `package.json` and pruned lock file with the project's `node_module` dependencies populated for installing in a container. If a `package.json` exists in the project's directory, it will be reused with dependencies populated."
       }
     },
-    "required": ["main", "outputPath", "tsConfig", "rspackConfig"],
+    "required": ["outputPath", "tsConfig", "rspackConfig"],
     "definitions": {
       "assetPattern": {
         "oneOf": [

packages/rspack/src/executors/rspack/schema.d.ts

@@ -2,7 +2,7 @@ import type { Mode } from '@rspack/core';
 
 export interface RspackExecutorSchema {
   target?: 'web' | 'node';
-  main: string;
+  main?: string;
   index?: string;
   tsConfig: string;
   typeCheck?: boolean;

packages/rspack/src/executors/rspack/schema.json

@@ -133,7 +133,7 @@
       "description": "Generates a `package.json` and pruned lock file with the project's `node_module` dependencies populated for installing in a container. If a `package.json` exists in the project's directory, it will be reused with dependencies populated."
     }
   },
-  "required": ["main", "outputPath", "tsConfig", "rspackConfig"],
+  "required": ["outputPath", "tsConfig", "rspackConfig"],
   "definitions": {
     "assetPattern": {
       "oneOf": [

packages/rspack/src/utils/create-compiler.ts

@@ -41,6 +41,8 @@ export async function createCompiler(
     config.devServer ??= options.devServer;
   }
 
+  validateConfig(config);
+
   return rspack(config);
 }
 
@@ -49,3 +51,16 @@ export function isMultiCompiler(
 ): compiler is MultiCompiler {
   return 'compilers' in compiler;
 }
+
+function validateConfig(config: Configuration) {
+  if (!config.entry) {
+    throw new Error(
+      'Entry is required. Please set the `main` option in the executor or the `entry` property in the rspack config.'
+    );
+  }
+  if (!config.output) {
+    throw new Error(
+      'Output is required. Please set the `outputPath` option in the executor or the `output` property in the rspack config.'
+    );
+  }
+}