scaffolder-backend: add build script for bundling nunjucks

Co-authored-by: Johan Haals <johan.haals@gmail.com>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/scaffolder-backend/package.json

@@ -27,7 +27,8 @@
     "test": "backstage-cli test",
     "prepack": "backstage-cli prepack",
     "postpack": "backstage-cli postpack",
-    "clean": "backstage-cli clean"
+    "clean": "backstage-cli clean",
+    "build:assets": "node scripts/build-nunjucks.js"
   },
   "dependencies": {
     "@backstage/backend-common": "^0.9.10",
@@ -79,6 +80,7 @@
     "@types/mock-fs": "^4.13.0",
     "@types/nunjucks": "^3.1.4",
     "@types/supertest": "^2.0.8",
+    "esbuild": "^0.13.14",
     "jest-when": "^3.1.0",
     "mock-fs": "^5.1.0",
     "msw": "^0.35.0",
@@ -88,7 +90,8 @@
   "files": [
     "dist",
     "migrations",
-    "config.d.ts"
+    "config.d.ts",
+    "assets"
   ],
   "configSchema": "config.d.ts"
 }

plugins/scaffolder-backend/scripts/build-nunjucks.js

@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* eslint-disable no-restricted-syntax */
+/* eslint-disable import/no-extraneous-dependencies */
+
+const path = require('path');
+
+const NUNJUCKS_LICENSE = `/**
+ * Copyright (c) 2012-2015, James Long
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *     Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+`;
+
+require('esbuild')
+  .build({
+    entryPoints: [require.resolve('nunjucks')],
+    bundle: true,
+    format: 'cjs',
+    platform: 'node',
+    target: 'node14',
+    banner: NUNJUCKS_LICENSE,
+    external: ['fsevents'],
+    outfile: path.resolve(__dirname, '../assets/nunjucks.js.txt'),
+  })
+  .catch(err => {
+    console.log(err.stack);
+    process.exit(1);
+  });