fix: update cross compilation config based on npm_config_target

src/config.ts

@@ -132,6 +132,7 @@ export function detectCrossCompilation(
     return true
   }
   if (
+    config.os === undefined &&
     process.env.npm_config_target_os !== undefined &&
     platforms.has(process.env.npm_config_target_os as NodeJS.Platform) &&
     process.env.npm_config_target_os !== process.platform
@@ -140,9 +141,11 @@ export function detectCrossCompilation(
     logger.debug(
       `Cross compilation detected: npm_config_target_os (${process.env.npm_config_target_os}) differs from process.platform (${process.platform})`,
     )
+    config.os = process.env.npm_config_target_os as NodeJS.Platform
     return true
   }
   if (
+    config.arch === undefined &&
     process.env.npm_config_target_arch !== undefined &&
     architectures.has(process.env.npm_config_target_arch as NodeJS.Architecture) &&
     process.env.npm_config_target_arch !== process.arch
@@ -151,6 +154,7 @@ export function detectCrossCompilation(
     logger.debug(
       `Cross compilation detected: npm_config_target_arch (${process.env.npm_config_target_arch}) differs from process.arch (${process.arch})`,
     )
+    config.arch = process.env.npm_config_target_arch as NodeJS.Architecture
     return true
   }
   return false

test/config.test.ts

@@ -133,7 +133,7 @@ suite("Config Functions", () => {
       expect(result.buildType).toBe("Release")
     })
 
-    test("should handle cross compilation flags", async () => {
+    test("should detect os cross compilation", async () => {
       const partialConfig: Partial<BuildConfiguration> = {
         os: process.platform === "win32" ? "linux" : "win32",
         arch: "x64",
@@ -142,6 +142,7 @@ suite("Config Functions", () => {
       const result = await getBuildConfig(mockBuildOptions, partialConfig, mockConfigFile)
 
       expect(result.cross).toBe(true)
+      expect(result.os).toBe(process.platform === "win32" ? "linux" : "win32")
     })
 
     test("should respect npm_config_target_arch when it matches config.arch", async () => {
@@ -195,7 +196,7 @@ suite("Config Functions", () => {
       vi.restoreAllMocks()
     })
 
-    test("should respect npm_config_target_arch when it differs from process.arch", async () => {
+    test("should respect config.arch when it differs from process.arch even if npm_config_target_arch is set", async () => {
       // Set npm_config_target_arch to a different architecture than the current one
       process.env.npm_config_target_arch = process.arch === "x64" ? "arm64" : "x64"
 
@@ -206,7 +207,29 @@ suite("Config Functions", () => {
 
       const result = await getBuildConfig(mockBuildOptions, partialConfig, mockConfigFile)
 
+      expect(result.cross).toBe(false)
+      expect(result.arch).toBe(process.arch)
+    })
+
+    test("should respect npm_config_target_arch when it differs from process.arch with default config", async () => {
+      // Set npm_config_target_arch to a different architecture than the current one
+      process.env.npm_config_target_arch = process.arch === "x64" ? "arm64" : "x64"
+
+      const result = await getBuildConfig(mockBuildOptions, {}, mockConfigFile)
+
+      expect(result.cross).toBe(true)
+      expect(result.arch).toBe(process.env.npm_config_target_arch)
+      expect(result.os).toBe(process.platform)
+    })
+
+    test("should respect npm_config_target_os when it differs from process.platform with default config", async () => {
+      // Set npm_config_target_os to a different platform than the current one
+      process.env.npm_config_target_os = process.platform === "win32" ? "linux" : "win32"
+
+      const result = await getBuildConfig(mockBuildOptions, {}, mockConfigFile)
+
       expect(result.cross).toBe(true)
+      expect(result.os).toBe(process.env.npm_config_target_os)
       expect(result.arch).toBe(process.arch)
     })