[plugin-helpers] npm -> yarn (#16632)

* [plugin-helpers] npm -> yarn

* Allow globs to not match when singular, e.g. for 'yarn.lock'

* --frozen-lockfile

packages/kbn-plugin-helpers/lib/plugin_config.js

@@ -1,5 +1,4 @@
 const resolve = require('path').resolve;
-const statSync = require('fs').statSync;
 const readFileSync = require('fs').readFileSync;
 const configFile = require('./config_file');
 
@@ -10,19 +9,12 @@ module.exports = function (root) {
   const config = configFile(root);
 
   const buildSourcePatterns = [
+    'yarn.lock',
     'package.json',
     'index.js',
     '{lib,public,server,webpackShims,translations}/**/*',
   ];
 
-  // add shrinkwrap and lock files, if they exist
-  ['npm-shrinkwrap.json', 'yarn.lock']
-    .forEach(function (file) {
-      if (fileExists(resolve(root, file))) {
-        buildSourcePatterns.push(file);
-      }
-    });
-
   return Object.assign({
     root: root,
     kibanaRoot: resolve(root, '../../kibana'),
@@ -33,12 +25,3 @@ module.exports = function (root) {
     version: pkg.version,
   }, config);
 };
-
-function fileExists(path) {
-  try {
-    const stat = statSync(path);
-    return stat.isFile();
-  } catch (e) {
-    return false;
-  }
-}

packages/kbn-plugin-helpers/tasks/build/create_build.js

@@ -1,6 +1,5 @@
 const join = require('path').join;
 const relative = require('path').relative;
-const statSync = require('fs').statSync;
 const execFileSync = require('child_process').execFileSync;
 const del = require('del');
 const vfs = require('vinyl-fs');
@@ -17,7 +16,7 @@ module.exports = function createBuild(plugin, buildTarget, buildVersion, kibanaV
     .then(function () {
       return new Promise(function (resolve, reject) {
         vfs
-          .src(files, { cwd: buildSource, base: buildSource })
+          .src(files, { cwd: buildSource, base: buildSource, allowEmpty: true })
           // modify the package.json file
           .pipe(rewritePackageJson(buildSource, buildVersion, kibanaVersion))
 
@@ -39,13 +38,6 @@ module.exports = function createBuild(plugin, buildTarget, buildVersion, kibanaV
         stdio: ['ignore', 'ignore', 'pipe'],
       };
 
-      try {
-        // use yarn if yarn lockfile is found in the build
-        statSync(join(buildRoot, 'yarn.lock'));
-        execFileSync(winCmd('yarn'), ['install', '--production'], options);
-      } catch (e) {
-        // use npm if there is no yarn lockfile in the build
-        execFileSync(winCmd('npm'), ['install', '--production', '--no-bin-links'], options);
-      }
+      execFileSync(winCmd('yarn'), ['install', '--production', '--frozen-lockfile'], options);
     });
 };

packages/kbn-plugin-helpers/tasks/test/browser/test_browser_action.js

@@ -15,8 +15,8 @@ module.exports = function testBrowserAction(plugin, run, options) {
   }
 
   const task = (options.dev) ? 'test:dev' : 'test:browser';
-  const args = ['run', task, '--'].concat(kbnServerArgs);
-  execFileSync(winCmd('npm'), args, {
+  const args = [task].concat(kbnServerArgs);
+  execFileSync(winCmd('yarn'), args, {
     cwd: plugin.kibanaRoot,
     stdio: ['ignore', 1, 2]
   });

packages/kbn-plugin-helpers/tasks/test/server/README.md

@@ -20,14 +20,14 @@ Server tests are written just like browser tests, they are just executed differe
 running the tests
 =================
 
-Running the server tests is simple, just execute `npm run test:server` in your terminal
+Running the server tests is simple, just execute `yarn test:server` in your terminal
 and all of the tests in your server will be run.
 
 By default, the runner will look for tests in `server/**/__tests__/**/*.js`. If you'd prefer to
-use a different collection of globs and files, you can specify them after the `npm run test:server`
+use a different collection of globs and files, you can specify them after the `yarn test:server`
 task, like so:
 
-`npm run test:server 'plugins/myplugins/server/__tests__/**/*.js'`
+`yarn test:server 'plugins/myplugins/server/__tests__/**/*.js'`
 
 NOTE: quoting the glob pattern is not required, but helps to avoid issues with globbing expansion
 in your shell.