use npm ci

generators/app/index.js

@@ -10,6 +10,7 @@ const constants = require('./constants');
 const naming = require('./naming');
 const packageJSON = require('./package-json');
 const validators = require('./validators');
+const spawnSync = require('child_process').spawnSync;
 
 module.exports = class extends Generator {
 
@@ -327,7 +328,26 @@ module.exports = class extends Generator {
    * we don't want to run that (or depend on it in any way).
    */
   install() {
-    this.npmInstall();
+    const result = spawnSync('npm', ['--version']);
+
+    // no access to npm uh oh, lets let yeoman throw an error
+    if (result.status !== 0) {
+      return this.npmInstall();
+    }
+
+    // get the major version for npm
+    const major = parseFloat(result.stdout.toString().trim().split('.')[0]);
+
+    if (!major || major <= 5) {
+      return this.npmInstall();
+    }
+
+    // if we are on npm greater than 6
+    // save time by updating package-lock-only
+    // and then running npm ci
+    spawnSync('npm', ['i', '--package-lock-only'], {stdio: 'inherit', cwd: this.destinationRoot()});
+    spawnSync('npm', ['ci'], {stdio: 'inherit', cwd: this.destinationRoot()});
+
   }
 
   /**

scripts/run-integration-tests.js

@@ -12,8 +12,9 @@ let tempDir;
 helpers.run(libs.GENERATOR_PATH)
   .inTmpDir(function(dir) {
     tempDir = dir;
+    console.log(`Generating Project in ${tempDir}`);
   })
-  .withOptions(libs.options())
+  .withOptions(Object.assign(libs.options(), {skipInstall: false}))
   .withPrompts({
     name: 'integration-test',
     author: 'John Doe',
@@ -46,9 +47,6 @@ helpers.run(libs.GENERATOR_PATH)
 
     const commands = [
       ['git', 'init'],
-      // mimics yeoman install command
-      ['npm', 'install', '--cache-min', '86400'],
-      ['npm', 'ci'],
       ['git', 'add', '--all'],
       ['git', 'commit', '-a', '-m', 'feat: initial release!'],
       ['npm', 'version', 'prerelease'],