Rename service to inject when needed (#2)

This adds a Babel plugin which renames `service` imports to `inject` if the current Ember version doesn't support this import yet.

This is a polyfill for RFC 752. More information can be found in the RFC PR: emberjs/rfcs#752

.eslintrc.js

@@ -32,7 +32,9 @@ module.exports = {
         './testem.js',
         './blueprints/*/index.js',
         './config/**/*.js',
+        './lib/**/*.js',
         './tests/dummy/config/**/*.js',
+        './tests/node/**/*.js',
       ],
       parserOptions: {
         sourceType: 'script',

.github/workflows/ci.yml

@@ -29,6 +29,8 @@ jobs:
         run: npm run lint
       - name: Run Tests
         run: npm run test:ember
+      - name: Run Node Tests
+        run: npm run test:node
 
   floating:
     name: "Floating Dependencies"

index.js

@@ -1,5 +1,28 @@
 'use strict';
 
+const { hasPlugin, addPlugin } = require('ember-cli-babel-plugin-helpers');
+const { resolve } = require('path');
+const VersionChecker = require('ember-cli-version-checker');
+
 module.exports = {
   name: require('./package').name,
+
+  included(parent) {
+    this._super.included.apply(this, arguments);
+
+    if (this.shouldPolyfillServiceImport()) {
+      let pluginPath = resolve(__dirname, './lib/plugin-rename-service-import');
+
+      if (!hasPlugin(parent, pluginPath)) {
+        addPlugin(parent, pluginPath);
+      }
+    }
+  },
+
+  shouldPolyfillServiceImport() {
+    let checker = new VersionChecker(this.project);
+
+    // https://github.com/emberjs/ember.js/pull/19776/commits/12b89c42d1987fd782d06f1f170eb7ce25612558
+    return checker.for('ember-source').lt('v4.1.0-alpha.5');
+  },
 };

lib/plugin-rename-service-import.js

@@ -0,0 +1,31 @@
+'use strict';
+
+module.exports = function () {
+  return {
+    name: 'plugin-rename-service-import',
+    visitor: {
+      ImportSpecifier(path) {
+        let { node: importSpecifier, parent: importDeclaration } = path;
+
+        if (
+          isEmberServiceModuleImport(importDeclaration) &&
+          isNewImportName(importSpecifier)
+        ) {
+          renameServiceImportToInject(importSpecifier);
+        }
+      },
+    },
+  };
+};
+
+function isEmberServiceModuleImport(importDeclaration) {
+  return importDeclaration.source.value === '@ember/service';
+}
+
+function isNewImportName(importSpecifier) {
+  return importSpecifier.imported.name === 'service';
+}
+
+function renameServiceImportToInject(importSpecifier) {
+  importSpecifier.imported.name = 'inject';
+}