support yarn

src/app/generator.js

@@ -62,6 +62,8 @@ Great success! Your new app "${options.name}" has been created.
 Change to the directory by running 'cd ${options.root} start the app with 'npm start'.
 `;
 
-      install(options).then(() => test(options).then(() => done(null, message)));
+      install(options)
+        .then(() => test(options)
+        .then(() => done(null, message)));
     });
 };

src/app/middleware/package-json.js

@@ -1,5 +1,6 @@
 import Debug from 'debug';
 import merge from 'lodash.merge';
+import { spawnSync as spawn } from 'child_process';
 
 const debug = Debug('feathers-generator'); // eslint-disable-line
 
@@ -61,8 +62,13 @@ export default function (options) {
       template.scripts.mocha = `NODE_ENV=testing mocha $(find {server,test} -name '*.test.js') --recursive`;
     }
 
-    const newJSON = merge(template, existing);
+    // if not yarn, fall back to npm
+    let yarn = spawn('yarn', ['--version']);
+    if(yarn.error) {
+      delete template['engines']['yarn'];
+    }
 
+    const newJSON = merge(template, existing);
     files['package.json'].contents = JSON.stringify(newJSON, null, 2);
 
     done();

src/app/templates/package.json

@@ -14,8 +14,8 @@
   "contributors": [],
   "bugs": {},
   "engines": {
-    "node": ">=0.12.0",
-    "npm": ">=2.0.0"
+    "node": ">=4.4.0",
+    "yarn": ">=0.19.1"
   },
   "semistandard": {
     "globals": [ "describe", "before", "after", "it" ]

src/repo/middleware/package-json.js

@@ -1,5 +1,6 @@
 import Debug from 'debug';
 import merge from 'lodash.merge';
+import { spawnSync as spawn } from 'child_process';
 
 const debug = Debug('feathers-generator'); // eslint-disable-line
 
@@ -57,8 +58,13 @@ export default function (options) {
       template.scripts.mocha = `NODE_ENV=testing mocha $(find {server,test} -name '*.test.js') --recursive`;
     }
 
-    const newJSON = merge(template, existing);
+    // if not yarn, fall back to npm
+    let yarn = spawn('yarn', ['--version']);
+    if(yarn.error) {
+      delete template['engines']['yarn'];
+    }
 
+    const newJSON = merge(template, existing);
     files['package.json'].contents = JSON.stringify(newJSON, null, 2);
 
     done();

src/repo/templates/package.json

@@ -14,8 +14,8 @@
   "contributors": [],
   "bugs": {},
   "engines": {
-    "node": ">=0.12.0",
-    "npm": ">=2.0.0"
+    "node": ">=4.4.0",
+    "yarn": ">=0.19.1"
   },
   "semistandard": {
     "globals": [ "describe", "before", "after", "it" ]

src/utils/install.js

@@ -2,21 +2,29 @@
  * Run npm install to install dependencies
  */
 
+import path from 'path';
 import Debug from 'debug';
 import { spawn } from 'child_process';
 
 const debug = Debug('feathers-generator:install');
 
 export default function (options) {
   return new Promise((resolve, reject) => {
+    let packagePath = path.resolve(options.root, 'package.json');
+    let packageJSON = require(packagePath);
+    let engine = packageJSON.engines.yarn ? 'yarn' : 'npm';
+
+    // yarn fall back is in src/app/middleware/package-json.js:68
+    // yarn fall back is in src/repo/middleware/package-json.js:60
+
     console.log();
-    console.log(`Installing dependencies...`);
+    console.log(`Installing dependencies using ${engine}...`);
     console.log();
 
-    const npm = spawn('npm', ['install'], {stdio: 'inherit', cwd: options.root});
+    const installer = spawn(engine, ['install'], {stdio: 'inherit', cwd: options.root});
 
-    npm.on('close', function (code) {
-      debug(`'npm install' exited with code ${code}`);
+    installer.on('close', function (code) {
+      debug(`'${engine} install' exited with code ${code}`);
 
       if (code === 0) {
         return resolve();

src/utils/test.js

@@ -2,24 +2,31 @@
  * Run npm test
  */
 
+import path from 'path';
 import Debug from 'debug';
 import { spawn } from 'child_process';
 
 const debug = Debug('feathers-generator:test');
 
 export default function (options) {
   return new Promise((resolve, reject) => {
+    let packagePath = path.resolve(options.root, 'package.json');
+    let packageJSON = require(packagePath);
+    let engine = packageJSON.engines.yarn ? 'yarn' : 'npm';
+
+    // TODO @slajax - async check that yarn is installed
+
     console.log();
-    console.log(`Running integration tests...`);
+    console.log(`Running integration tests using ${engine}...`);
     console.log(options.root);
 
-    const npm = spawn('npm', ['test'], {stdio: 'inherit', cwd: process.cwd() });
+    const tester = spawn(engine, ['test'], {stdio: 'inherit', cwd: process.cwd() });
 
-    npm.on('close', function (code) {
-      debug(`'npm test' exited with code ${code}`);
+    tester.on('close', function (code) {
+      debug(`'${engine} test' exited with code ${code}`);
 
       if (code === 0) {
-        debug('npm test ran successfully');
+        debug(`${engine} test ran successfully`);
         return resolve();
       }