Initial support for Typescript decl file (#330)

cmd/helpers.go

@@ -99,8 +99,7 @@ func BuildApplication(binaryName string, forceRebuild bool, buildMode string, pa
 				binaryName = strings.TrimSuffix(binaryName, ".exe")
 			}
 		}
-		buildCommand.Add("-o")
-		buildCommand.Add(binaryName)
+		buildCommand.Add("-o", binaryName)
 	}
 
 	// If we are forcing a rebuild
@@ -121,6 +120,16 @@ func BuildApplication(binaryName string, forceRebuild bool, buildMode string, pa
 
 	ldflags += "-X github.com/wailsapp/wails.BuildMode=" + buildMode
 
+	// If we wish to generate typescript
+	if projectOptions.typescriptDefsFilename != "" {
+		cwd, err := os.Getwd()
+		if err != nil {
+			return err
+		}
+		filename := filepath.Join(cwd, projectOptions.FrontEnd.Dir, projectOptions.typescriptDefsFilename)
+		ldflags += " -X github.com/wailsapp/wails/lib/binding.typescriptDefinitionFilename=" + filename
+	}
+
 	buildCommand.AddSlice([]string{"-ldflags", ldflags})
 	err = NewProgramHelper().RunCommandArray(buildCommand.AsSlice())
 	if err != nil {

cmd/project.go

@@ -142,21 +142,22 @@ func (ph *ProjectHelper) NewProjectOptions() *ProjectOptions {
 
 // ProjectOptions holds all the options available for a project
 type ProjectOptions struct {
-	Name             string    `json:"name"`
-	Description      string    `json:"description"`
-	Author           *author   `json:"author,omitempty"`
-	Version          string    `json:"version"`
-	OutputDirectory  string    `json:"-"`
-	UseDefaults      bool      `json:"-"`
-	Template         string    `json:"-"`
-	BinaryName       string    `json:"binaryname"`
-	FrontEnd         *frontend `json:"frontend,omitempty"`
-	NPMProjectName   string    `json:"-"`
-	system           *SystemHelper
-	log              *Logger
-	templates        *TemplateHelper
-	selectedTemplate *TemplateDetails
-	WailsVersion     string
+	Name                   string    `json:"name"`
+	Description            string    `json:"description"`
+	Author                 *author   `json:"author,omitempty"`
+	Version                string    `json:"version"`
+	OutputDirectory        string    `json:"-"`
+	UseDefaults            bool      `json:"-"`
+	Template               string    `json:"-"`
+	BinaryName             string    `json:"binaryname"`
+	FrontEnd               *frontend `json:"frontend,omitempty"`
+	NPMProjectName         string    `json:"-"`
+	system                 *SystemHelper
+	log                    *Logger
+	templates              *TemplateHelper
+	selectedTemplate       *TemplateDetails
+	WailsVersion           string
+	typescriptDefsFilename string
 }
 
 // Defaults sets the default project template
@@ -165,6 +166,11 @@ func (po *ProjectOptions) Defaults() {
 	po.WailsVersion = Version
 }
 
+// SetTypescriptDefsFilename indicates that we want to generate typescript bindings to the given file
+func (po *ProjectOptions) SetTypescriptDefsFilename(filename string) {
+	po.typescriptDefsFilename = filename
+}
+
 // GetNPMBinaryName returns the type of package manager used by the project
 func (po *ProjectOptions) GetNPMBinaryName() (PackageManager, error) {
 	if po.FrontEnd == nil {

cmd/wails/4_build.go

@@ -13,6 +13,8 @@ func init() {
 	var packageApp = false
 	var forceRebuild = false
 	var debugMode = false
+	var typescriptFilename = ""
+
 	buildSpinner := spinner.NewSpinner()
 	buildSpinner.SetSpinSpeed(50)
 
@@ -21,7 +23,8 @@ func init() {
 		LongDescription(commandDescription).
 		BoolFlag("p", "Package application on successful build", &packageApp).
 		BoolFlag("f", "Force rebuild of application components", &forceRebuild).
-		BoolFlag("d", "Build in Debug mode", &debugMode)
+		BoolFlag("d", "Build in Debug mode", &debugMode).
+		StringFlag("t", "Generate Typescript definitions to given file (at runtime)", &typescriptFilename)
 
 	initCmd.Action(func() error {
 
@@ -73,16 +76,13 @@ func init() {
 				return err
 			}
 
-				// Ensure that runtime init.js is the production version
-				err = cmd.InstallProdRuntime(projectDir, projectOptions)
-				if err != nil {
-					return err
-				}
+			// Ensure that runtime init.js is the production version
+			err = cmd.InstallProdRuntime(projectDir, projectOptions)
+			if err != nil {
+				return err
+			}
 		}
 
-	
-
-
 		// Move to project directory
 		err = os.Chdir(projectDir)
 		if err != nil {
@@ -101,6 +101,11 @@ func init() {
 			buildMode = cmd.BuildModeDebug
 		}
 
+		// Save if we wish to dump typescript or not
+		if typescriptFilename != "" {
+			projectOptions.SetTypescriptDefsFilename(typescriptFilename)
+		}
+
 		err = cmd.BuildApplication(projectOptions.BinaryName, forceRebuild, buildMode, packageApp, projectOptions)
 		if err != nil {
 			return err