Update warning as errors config

Author: Kyle-Ye

Package.resolved

@@ -6,7 +6,7 @@
       "location" : "https://github.com/OpenSwiftUIProject/OpenGraph",
       "state" : {
         "branch" : "main",
-        "revision" : "8f0376278186b6e24e8d7a07a560f3efaa2fef1d"
+        "revision" : "8cc89abc1fff74b387a083eab8ffa91f1b9fdca7"
       }
     },
     {

Package.swift

@@ -4,39 +4,63 @@
 import Foundation
 import PackageDescription
 
-let isXcodeEnv = ProcessInfo.processInfo.environment["__CFBundleIdentifier"] == "com.apple.dt.Xcode"
+func envEnable(_ key: String, default defaultValue: Bool = false) -> Bool {
+    guard let value = Context.environment[key] else {
+        return defaultValue
+    }
+    if value == "1" {
+        return true
+    } else if value == "0" {
+        return false
+    } else {
+        return defaultValue
+    }
+}
+
+let isXcodeEnv = Context.environment["__CFBundleIdentifier"] == "com.apple.dt.Xcode"
+
 // Xcode use clang as linker which supports "-iframework" while SwiftPM use swiftc as linker which supports "-Fsystem"
 let systemFrameworkSearchFlag = isXcodeEnv ? "-iframework" : "-Fsystem"
 
+var sharedSwiftSettings: [SwiftSetting] = [
+    .enableExperimentalFeature("AccessLevelOnImport"),
+    .define("OPENSWIFTUI_SUPPRESS_DEPRECATED_WARNINGS"),
+]
+
+let warningsAsErrorsCondition = envEnable("OPENSWIFTUI_WERROR", default: isXcodeEnv)
+if warningsAsErrorsCondition {
+    sharedSwiftSettings.append(.unsafeFlags(["-warnings-as-errors"]))
+}
+
 let openSwiftUITarget = Target.target(
     name: "OpenSwiftUI",
     dependencies: [
         "OpenSwiftUIShims",
         .target(name: "CoreServices", condition: .when(platforms: [.iOS])),
         .product(name: "OpenGraphShims", package: "OpenGraph"),
     ],
-    swiftSettings: [
-        .enableExperimentalFeature("AccessLevelOnImport"),
-        .define("OPENSWIFTUI_SUPPRESS_DEPRECATED_WARNINGS"),
-    ]
+    swiftSettings: sharedSwiftSettings
 )
 let openSwiftUITestTarget = Target.testTarget(
     name: "OpenSwiftUITests",
     dependencies: [
         "OpenSwiftUI",
     ],
-    exclude: ["README.md"]
+    exclude: ["README.md"],
+    swiftSettings: sharedSwiftSettings
 )
 let openSwiftUITempTestTarget = Target.testTarget(
     name: "OpenSwiftUITempTests",
     dependencies: [
         "OpenSwiftUI",
     ],
-    exclude: ["README.md"]
+    exclude: ["README.md"],
+    swiftSettings: sharedSwiftSettings
 )
 let openSwiftUICompatibilityTestTarget = Target.testTarget(
     name: "OpenSwiftUICompatibilityTests",
-    exclude: ["README.md"]
+    exclude: ["README.md"],
+    swiftSettings: sharedSwiftSettings
 )
 
 let package = Package(
@@ -71,19 +95,6 @@ let package = Package(
     ]
 )
 
-func envEnable(_ key: String, default defaultValue: Bool = false) -> Bool {
-    guard let value = ProcessInfo.processInfo.environment[key] else {
-        return defaultValue
-    }
-    if value == "1" {
-        return true
-    } else if value == "0" {
-        return false
-    } else {
-        return defaultValue
-    }
-}
-
 #if os(macOS)
 let attributeGraphCondition = envEnable("OPENGRAPH_ATTRIBUTEGRAPH", default: true)
 #else