From 93ea6704dc41c2709dfc51d982f9ce1ae571d535 Mon Sep 17 00:00:00 2001
From: Adam Shannon <adamkshannon@gmail.com>
Date: Mon, 24 Feb 2025 15:45:34 -0600
Subject: [PATCH] commands/package-web: check go1.24 ./lib/wasm/ for
 wasm_exec.js

Co-authored-by: Jacalz <jacalz@tutanota.com>
---
 cmd/fyne/internal/commands/package-web.go  |  6 +++++-
 cmd/fyne/internal/commands/package_test.go | 15 +++++++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/cmd/fyne/internal/commands/package-web.go b/cmd/fyne/internal/commands/package-web.go
index 86cab4ea18..2de8c51808 100644
--- a/cmd/fyne/internal/commands/package-web.go
+++ b/cmd/fyne/internal/commands/package-web.go
@@ -71,7 +71,11 @@ func (w webData) packageWebInternal(appDir string, exeWasmSrc string, exeJSSrc s
 		return err
 	}
 
-	wasmExecSrc := filepath.Join(runtime.GOROOT(), "misc", "wasm", "wasm_exec.js")
+	goroot := runtime.GOROOT()
+	wasmExecSrc := filepath.Join(goroot, "lib", "wasm", "wasm_exec.js")
+	if !util.Exists(wasmExecSrc) { // Fallback for Go < 1.24:
+		wasmExecSrc = filepath.Join(goroot, "misc", "wasm", "wasm_exec.js")
+	}
 	wasmExecDst := filepath.Join(appDir, "wasm_exec.js")
 	err = util.CopyFile(wasmExecSrc, wasmExecDst)
 	if err != nil {
diff --git a/cmd/fyne/internal/commands/package_test.go b/cmd/fyne/internal/commands/package_test.go
index a3bc944552..b796dda9cb 100644
--- a/cmd/fyne/internal/commands/package_test.go
+++ b/cmd/fyne/internal/commands/package_test.go
@@ -238,16 +238,27 @@ func Test_PackageWasm(t *testing.T) {
 		return expectedEnsureSubDirRuns.verifyExpectation(t, parent, name)
 	}
 
+	// Handle lookup for wasm_exec.js from lib folder in Go 1.24 and newer:
+	goroot := runtime.GOROOT()
+	wasmExecJSPath := filepath.Join(goroot, "lib", "wasm", "wasm_exec.js")
+	_, err := os.Stat(wasmExecJSPath)
+	execJSLibExists := err == nil || !os.IsNotExist(err)
+
 	expectedExistRuns := mockExistRuns{
 		expected: []mockExist{
 			{"myTest.wasm", false},
 			{"myTest.wasm", true},
+			{wasmExecJSPath, execJSLibExists},
 		},
 	}
 	utilExistsMock = func(path string) bool {
 		return expectedExistRuns.verifyExpectation(t, path)
 	}
 
+	if !execJSLibExists { // Expect location from Go < 1.24 to have been copied:
+		wasmExecJSPath = filepath.Join(goroot, "misc", "wasm", "wasm_exec.js")
+	}
+
 	expectedWriteFileRuns := mockWriteFileRuns{
 		expected: []mockWriteFile{
 			{filepath.Join("myTestTarget", "wasm", "index.html"), nil},
@@ -265,7 +276,7 @@ func Test_PackageWasm(t *testing.T) {
 	expectedCopyFileRuns := mockCopyFileRuns{
 		expected: []mockCopyFile{
 			{source: "myTest.png", target: filepath.Join("myTestTarget", "wasm", "icon.png")},
-			{source: filepath.Join(runtime.GOROOT(), "misc", "wasm", "wasm_exec.js"), target: filepath.Join("myTestTarget", "wasm", "wasm_exec.js")},
+			{source: wasmExecJSPath, target: filepath.Join("myTestTarget", "wasm", "wasm_exec.js")},
 			{source: "myTest.wasm", target: filepath.Join("myTestTarget", "wasm", "myTest.wasm")},
 		},
 	}
@@ -273,7 +284,7 @@ func Test_PackageWasm(t *testing.T) {
 		return expectedCopyFileRuns.verifyExpectation(t, false, source, target)
 	}
 
-	err := p.doPackage(wasmBuildTest)
+	err = p.doPackage(wasmBuildTest)
 	assert.Nil(t, err)
 	wasmBuildTest.verifyExpectation()
 	expectedTotalCount(t, len(expectedEnsureSubDirRuns.expected), expectedEnsureSubDirRuns.current)