Different npm install result from npm 5.

Author: TomaNikolov

lib/declarations.d.ts

@@ -149,6 +149,37 @@ interface INpmPeerDependencyInfo {
 	peerMissing: boolean;
 }
 
+/**
+ * Describes information about dependency update packages.
+ */
+interface INpmDependencyUpdateInfo {
+	/**
+	 * Npm action type.
+	 * @type {string}
+	 */
+	action: string;
+	/**
+	 * Dependency name.
+	 * @type {string}
+	 */
+	name: string;
+	/**
+	 * Dependency version.
+	 * @type {string}
+	 */
+	version: string;
+	/**
+	 * Destination of the installation.
+	 * @type {string}
+	 */
+	path: string;
+	/**
+	 * Dependency previous version.
+	 * @type {string}
+	 */
+	previousVersion: string;
+}
+
 /**
  * Describes information returned by the npm CLI upon calling install with --json flag.
  */
@@ -168,7 +199,13 @@ interface INpmInstallCLIResult {
 	 * Whenever installing npm prints the information by reversing the tree of operations and because the initial dependency was installed last it is listed first.
 	 * @type {INpmDependencyInfo | INpmPeerDependencyInfo}
 	 */
-	dependencies: INpmDependencyInfo | INpmPeerDependencyInfo;
+	dependencies?: INpmDependencyInfo | INpmPeerDependencyInfo;
+
+	/**
+	 * Updated dependencies. Note that whenever update a particular dependency with npm 5 it is listed inside of array with key "updated".
+	 * @type {INpmDependencyUpdateInfo[]}
+	 */
+	updated?: INpmDependencyUpdateInfo[];
 	/**
 	 * Describes problems that might have occurred during installation. For example missing peer dependencies.
 	 */

lib/node-package-manager.ts

@@ -145,6 +145,18 @@ export class NodePackageManager implements INodePackageManager {
 		try {
 			const originalOutput: INpmInstallCLIResult = JSON.parse(npmDryRunInstallOutput);
 			const name = _.head(_.keys(originalOutput.dependencies));
+
+			// Npm 5 return different object after performing `npm install --dry-run`.
+			// Considering that the dependency is already installed we should
+			// find it in the `updated` key as a first element of the array.
+			if (!name && originalOutput.updated) {
+				const updatedDependency = originalOutput.updated[0];
+				return {
+					name: updatedDependency.name,
+					originalOutput,
+					version: updatedDependency.version
+				};
+			}
 			const dependency = _.pick<INpmDependencyInfo, INpmDependencyInfo | INpmPeerDependencyInfo>(originalOutput.dependencies, name);
 			return {
 				name,