Relax Migration check for package.json in root

docs/Core/Migration-Checks.md

@@ -8,7 +8,9 @@ When you build an Electron.NET project, the following validation checks are perf
 
 | Code | Check | Description |
 |------|-------|-------------|
-| [ELECTRON001](#1-packagejson-not-allowed) | package.json not allowed | Ensures no package.json exists outside ElectronHostHook |
+| [ELECTRON001](#1-packagejson-rules) | package.json location rules | Ensures `package.json`/`package-lock.json` aren’t present in unsupported locations (root `package.json` handled separately) |
+| [ELECTRON008](#1-packagejson-rules) | root package.json contains electron | Warns when root `package.json` contains the word `electron` (case-insensitive) |
+| [ELECTRON009](#1-packagejson-rules) | root package.json copied to output | Warns when root `package.json` is configured to be copied to output/publish |
 | [ELECTRON002](#2-electron-manifestjson-not-allowed) | electron-manifest.json not allowed | Detects deprecated manifest files |
 | [ELECTRON003](#3-electron-builderjson-location) | electron-builder.json location | Verifies electron-builder.json exists in Properties folder |
 | [ELECTRON004](#3-electron-builderjson-location) | electron-builder.json wrong location | Warns if electron-builder.json is found in incorrect locations |
@@ -18,24 +20,38 @@ When you build an Electron.NET project, the following validation checks are perf
 
 ---
 
-## 1. package.json not allowed
+## 1. package.json rules
 
-**Warning Code:** `ELECTRON001`
+**Warning Codes:** `ELECTRON001`, `ELECTRON008`, `ELECTRON009`
 
 ### What is checked
 
-The build system scans for `package.json` and `package-lock.json` files in your project directory. These files should not exist in the project root or subdirectories (with one exception).
+The build system scans for `package.json` and `package-lock.json` files in your project directory.
+
+Rules:
+
+- **ELECTRON001**: `package.json` / `package-lock.json` must not exist in the project directory or subdirectories
+  - Exception: `ElectronHostHook` folder is allowed
+  - Note: a **root** `package.json` is **excluded** from `ELECTRON001` and validated by `ELECTRON008` / `ELECTRON009`
+
+- **ELECTRON008**: If a root `package.json` exists, it must **not** contain electron-related dependencies or configuration.
+
+- **ELECTRON009**: If a root `package.json` exists, it must **not** be configured to be copied to output/publish (for example via `CopyToOutputDirectory` / `CopyToPublishDirectory` metadata)
 
 ### Why this matters
 
-In previous versions of Electron.NET, a `package.json` file was required in the project. The new version generates this file automatically from MSBuild properties defined in your `.csproj` file.
+Electron.NET generates its Electron-related `package.json` during publishing based on MSBuild properties. A user-maintained Electron-related `package.json` can conflict with that process.
+
+Also, ensuring the root `package.json` is not copied prevents accidentally shipping it with the published app.
 
 ### Exception
 
-A `package.json` file **is allowed** in the `ElectronHostHook` folder if you're using custom host hooks. This is the only valid location for a manually maintained package.json.
+A `package.json` / `package-lock.json` file **is allowed** in the `ElectronHostHook` folder if you're using custom host hooks.
 
 ### How to fix
 
+If you have an Electron-related `package.json` from older Electron.NET versions:
+
 1. **Open your project's `.csproj` file**
 2. **Add the required properties** to a PropertyGroup with the label `ElectronNetCommon`:
 
@@ -51,7 +67,12 @@ A `package.json` file **is allowed** in the `ElectronHostHook` folder if you're
 </PropertyGroup>
 ```
 
-3. **Delete the old `package.json`** file from your project root
+3. **Delete** Electron-related `package.json` / `package-lock.json` files (except those under `ElectronHostHook` if applicable)
+
+If you keep a root `package.json` for non-Electron reasons:
+
+- Ensure it does **not** contain electron dependencies or configuration (fixes `ELECTRON008`)
+- Ensure it is **not** copied to output/publish (fixes `ELECTRON009`)
 
 > **See also:** [Migration Guide](Migration-Guide.md) for complete migration instructions.
 

src/ElectronNET/build/ElectronNET.MigrationChecks.targets

@@ -4,6 +4,8 @@
   <PropertyGroup>
     <ElectronMigrationChecksDependsOn>
       ElectronCheckNoPackageJson;
+      ElectronCheckRootPackageJsonNoElectron;
+      ElectronCheckRootPackageJsonNotCopied;
       ElectronCheckNoManifestJson;
       ElectronCheckElectronBuilderJson;
       ElectronCheckNoParentPaths;
@@ -19,14 +21,17 @@
   </Target>
 
   <!--
-    Check 1: No package.json must be present in the project (except ElectronHostHook folder)
+    Check 1: No package.json/package-lock.json must be present in the project (except ElectronHostHook folder)
+
+    NOTE: Root package.json is excluded from ELECTRON001 and checked by separate targets.
   -->
   <Target Name="ElectronCheckNoPackageJson">
 
-    <!-- Find all package.json files, excluding ElectronHostHook folder and output directories -->
+    <!-- Find all package.json files, excluding ElectronHostHook folder, root, and output directories -->
     <ItemGroup>
       <_InvalidPackageJson Include="$(MSBuildProjectDirectory)\**\package.json"
-                           Exclude="$(MSBuildProjectDirectory)\ElectronHostHook\**\package.json;
+                           Exclude="$(MSBuildProjectDirectory)\package.json;
+                                    $(MSBuildProjectDirectory)\ElectronHostHook\**\package.json;
                                     $(MSBuildProjectDirectory)\bin\**\package.json;
                                     $(MSBuildProjectDirectory)\obj\**\package.json;
                                     $(MSBuildProjectDirectory)\publish\**\package.json;
@@ -46,17 +51,87 @@
 
     <Warning Condition="'$(_HasInvalidPackageJson)' == 'true'"
              Code="ELECTRON001"
-             Text="Found package.json or package-lock.json file(s) in the project root or subdirectories. These files are no longer supported in this location.
+             Text="Found package.json or package-lock.json file(s) in unsupported location(s). These files are no longer supported in this location.
 
 Files found:
 @(_InvalidPackageJson, '%0A')@(_InvalidPackageLockJson, '%0A')
 
 MIGRATION REQUIRED:
-All properties from an existing package.json file must now be specified as MSBuild properties in the project file.
+All Electron.NET-related properties from an existing package.json must now be specified as MSBuild properties in the project file.
 
 For more information, see: https://github.com/ElectronNET/Electron.NET/wiki/Migration-Checks#1-packagejson-not-allowed
 
-EXCEPTION: package.json and package-lock.json files ARE allowed in the 'ElectronHostHook' folder for custom host hook implementations." />
+EXCEPTION:
+- package.json and package-lock.json files ARE allowed in the 'ElectronHostHook' folder for custom host hook implementations.
+- A package.json in the project root is handled by separate migration checks." />
+
+  </Target>
+
+  <!--
+    Check 1b: Root package.json must not contain Electron-related configuration
+  -->
+  <Target Name="ElectronCheckRootPackageJsonNoElectron"
+          Condition="Exists('$(MSBuildProjectDirectory)\package.json')">
+
+    <ItemGroup>
+      <_RootPackageJsonLines Include="$([System.IO.File]::ReadAllLines('$(MSBuildProjectDirectory)\package.json'))" />
+    </ItemGroup>
+
+    <PropertyGroup>
+      <_RootPackageJsonContent>@(_RootPackageJsonLines, ' ')</_RootPackageJsonContent>
+      <_RootPackageJsonHasElectron>false</_RootPackageJsonHasElectron>
+      <_RootPackageJsonHasElectron Condition="$([System.Text.RegularExpressions.Regex]::IsMatch('$(_RootPackageJsonContent)', 'electron', System.Text.RegularExpressions.RegexOptions.IgnoreCase))">true</_RootPackageJsonHasElectron>
+    </PropertyGroup>
+
+    <Warning
+      Condition="'$(_RootPackageJsonHasElectron)' == 'true'"
+      Code="ELECTRON008"
+      Text="The project contains a root package.json that references 'electron' (case-insensitive).
+
+File:
+$(MSBuildProjectDirectory)\package.json
+
+MIGRATION REQUIRED:
+Electron.NET configuration must be defined via MSBuild properties and electron-builder.json (not via a user-provided package.json).
+
+HOW TO FIX:
+- Remove Electron-related entries from the root package.json, or delete the file if it's only used for Electron configuration.
+
+For more information, see: https://github.com/ElectronNET/Electron.NET/wiki/Migration-Checks#1-packagejson-not-allowed" />
+
+  </Target>
+
+  <!--
+    Check 1c: Root package.json must not be copied to output/publish
+  -->
+  <Target Name="ElectronCheckRootPackageJsonNotCopied"
+          Condition="Exists('$(MSBuildProjectDirectory)\package.json')">
+
+    <ItemGroup>
+      <_RootPackageJsonFile Include="@(Content);@(None)"
+                              Condition="'%(Identity)' == 'package.json' OR '%(Identity)' == '$(MSBuildProjectDirectory)\package.json'" />
+    </ItemGroup>
+
+    <PropertyGroup>
+      <_RootPackageJsonIsCopied>false</_RootPackageJsonIsCopied>
+      <_RootPackageJsonIsCopied Condition="'@(_RootPackageJsonFile)' != '' AND ( '%(_RootPackageJsonFile.CopyToOutputDirectory)' != '' OR '%(_RootPackageJsonFile.CopyToPublishDirectory)' != '' )">true</_RootPackageJsonIsCopied>
+    </PropertyGroup>
+
+    <Warning
+      Condition="'$(_RootPackageJsonIsCopied)' == 'true'"
+      Code="ELECTRON009"
+      Text="The project contains a root package.json that is configured to be copied to the output/publish directory.
+
+File:
+$(MSBuildProjectDirectory)\package.json
+
+MIGRATION REQUIRED:
+Root package.json must not be copied during build/publish.
+
+HOW TO FIX:
+- Remove CopyToOutputDirectory / CopyToPublishDirectory metadata for package.json in your project file.
+
+For more information, see: https://github.com/ElectronNET/Electron.NET/wiki/Migration-Checks#1-packagejson-not-allowed" />
 
   </Target>