Revert "Don't generate manifest.ts (#127)"

This reverts commit 18d30b5.

.gitattributes

@@ -1 +1,2 @@
 server/manifest.go linguist-generated=true
+webapp/src/manifest.js linguist-generated=true

build/manifest/main.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"strings"
 
 	"github.com/mattermost/mattermost/server/public/model"
 	"github.com/pkg/errors"
@@ -31,6 +32,17 @@ func init() {
 }
 `
 
+const pluginIDJSFileTemplate = `// This file is automatically generated. Do not modify it manually.
+
+const manifest = JSON.parse(` + "`" + `
+%s
+` + "`" + `);
+
+export default manifest;
+export const id = manifest.id;
+export const version = manifest.version;
+`
+
 func main() {
 	if len(os.Args) <= 1 {
 		panic("no cmd specified")
@@ -122,5 +134,28 @@ func applyManifest(manifest *model.Manifest) error {
 		}
 	}
 
+	if manifest.HasWebapp() {
+		// generate JSON representation of Manifest.
+		// JSON is very similar and compatible with JS's object literals. so, what we do here
+		// is actually JS code generation.
+		manifestBytes, err := json.MarshalIndent(manifest, "", "    ")
+		if err != nil {
+			return err
+		}
+		manifestStr := string(manifestBytes)
+
+		// Escape newlines
+		manifestStr = strings.ReplaceAll(manifestStr, `\n`, `\\n`)
+
+		// write generated code to file by using JS file template.
+		if err := ioutil.WriteFile(
+			"webapp/src/manifest.ts",
+			[]byte(fmt.Sprintf(pluginIDJSFileTemplate, manifestStr)),
+			0600,
+		); err != nil {
+			return errors.Wrap(err, "failed to open webapp/src/manifest.js")
+		}
+	}
+
 	return nil
 }

webapp/src/manifest.ts

@@ -1,3 +1,37 @@
-import manifest from '@/../../plugin.json';
+// This file is automatically generated. Do not modify it manually.
 
-export {manifest};
+const manifest = JSON.parse(`
+{
+    "id": "com.mattermost.plugin-starter-template",
+    "name": "Plugin Starter Template",
+    "description": "This plugin serves as a starting point for writing a Mattermost plugin.",
+    "homepage_url": "/~https://github.com/mattermost/mattermost-plugin-starter-template",
+    "support_url": "/~https://github.com/mattermost/mattermost-plugin-starter-template/issues",
+    "release_notes_url": "/~https://github.com/mattermost/mattermost-plugin-starter-template/releases/tag/v0.1.0",
+    "icon_path": "assets/starter-template-icon.svg",
+    "version": "0.1.0",
+    "min_server_version": "6.2.1",
+    "server": {
+        "executables": {
+            "darwin-amd64": "server/dist/plugin-darwin-amd64",
+            "darwin-arm64": "server/dist/plugin-darwin-arm64",
+            "linux-amd64": "server/dist/plugin-linux-amd64",
+            "linux-arm64": "server/dist/plugin-linux-arm64",
+            "windows-amd64": "server/dist/plugin-windows-amd64.exe"
+        },
+        "executable": ""
+    },
+    "webapp": {
+        "bundle_path": "webapp/dist/main.js"
+    },
+    "settings_schema": {
+        "header": "",
+        "footer": "",
+        "settings": []
+    }
+}
+`);
+
+export default manifest;
+export const id = manifest.id;
+export const version = manifest.version;