diff --git a/src/harness/unittests/typingsInstaller.ts b/src/harness/unittests/typingsInstaller.ts
index a0a770ad093..92ecd5e31b8 100644
--- a/src/harness/unittests/typingsInstaller.ts
+++ b/src/harness/unittests/typingsInstaller.ts
@@ -1050,6 +1050,7 @@ namespace ts.projectSystem {
             const result = JsTyping.discoverTypings(host, logger.log, [app.path, jquery.path, chroma.path], getDirectoryPath(<Path>app.path), safeList, emptyMap, { enable: true }, emptyArray);
             assert.deepEqual(logger.finish(), [
                 'Inferred typings from file names: ["jquery","chroma-js"]',
+                "Inferred typings from unresolved imports: []",
                 'Result: {"cachedTypingPaths":[],"newTypingNames":["jquery","chroma-js"],"filesToWatch":["/a/b/bower_components","/a/b/node_modules"]}',
             ]);
             assert.deepEqual(result.newTypingNames, ["jquery", "chroma-js"]);
@@ -1114,6 +1115,8 @@ namespace ts.projectSystem {
             const result = JsTyping.discoverTypings(host, logger.log, [app.path], getDirectoryPath(<Path>app.path), emptySafeList, cache, { enable: true }, /*unresolvedImports*/ []);
             assert.deepEqual(logger.finish(), [
                 'Searching for typing names in /node_modules; all files: ["/node_modules/a/package.json"]',
+                '    Found package names: ["a"]',
+                "Inferred typings from unresolved imports: []",
                 'Result: {"cachedTypingPaths":[],"newTypingNames":["a"],"filesToWatch":["/bower_components","/node_modules"]}',
             ]);
             assert.deepEqual(result, {
diff --git a/src/services/jsTyping.ts b/src/services/jsTyping.ts
index 84f2ef5ba9a..4de7bb3191d 100644
--- a/src/services/jsTyping.ts
+++ b/src/services/jsTyping.ts
@@ -22,6 +22,7 @@ namespace ts.JsTyping {
         name?: string;
         optionalDependencies?: MapLike<string>;
         peerDependencies?: MapLike<string>;
+        types?: string;
         typings?: string;
     }
 
@@ -83,14 +84,11 @@ namespace ts.JsTyping {
 
         const filesToWatch: string[] = [];
 
-        forEach(typeAcquisition.include, addInferredTyping);
+        if (typeAcquisition.include) addInferredTypings(typeAcquisition.include, "Explicitly included types");
         const exclude = typeAcquisition.exclude || [];
 
         // Directories to search for package.json, bower.json and other typing information
-        const possibleSearchDirs = createMap<true>();
-        for (const f of fileNames) {
-            possibleSearchDirs.set(getDirectoryPath(f), true);
-        }
+        const possibleSearchDirs = arrayToSet(fileNames, getDirectoryPath);
         possibleSearchDirs.set(projectRootPath, true);
         possibleSearchDirs.forEach((_true, searchDir) => {
             const packageJsonPath = combinePaths(searchDir, "package.json");
@@ -109,13 +107,8 @@ namespace ts.JsTyping {
 
         // add typings for unresolved imports
         if (unresolvedImports) {
-            const x = unresolvedImports.map(moduleId => nodeCoreModules.has(moduleId) ? "node" : moduleId);
-            if (x.length && log) log(`Inferred typings from unresolved imports: ${JSON.stringify(x)}`);
-            for (const typingName of x) {
-                if (!inferredTypings.has(typingName)) {
-                    inferredTypings.set(typingName, undefined);
-                }
-            }
+            const module = deduplicate(unresolvedImports.map(moduleId => nodeCoreModules.has(moduleId) ? "node" : moduleId));
+            addInferredTypings(module, "Inferred typings from unresolved imports");
         }
         // Add the cached typing locations for inferred typings that are already installed
         packageNameToTypingLocation.forEach((typingLocation, name) => {
@@ -126,7 +119,8 @@ namespace ts.JsTyping {
 
         // Remove typings that the user has added to the exclude list
         for (const excludeTypingName of exclude) {
-            inferredTypings.delete(excludeTypingName);
+            const didDelete = inferredTypings.delete(excludeTypingName);
+            if (didDelete && log) log(`Typing for ${excludeTypingName} is in exclude list, will be ignored.`);
         }
 
         const newTypingNames: string[] = [];
@@ -148,6 +142,10 @@ namespace ts.JsTyping {
                 inferredTypings.set(typingName, undefined);
             }
         }
+        function addInferredTypings(typingNames: ReadonlyArray<string>, message: string) {
+            if (log) log(`${message}: ${JSON.stringify(typingNames)}`);
+            forEach(typingNames, addInferredTyping);
+        }
 
         /**
          * Get the typing info from common package manager json files like package.json or bower.json
@@ -158,20 +156,9 @@ namespace ts.JsTyping {
             }
 
             filesToWatch.push(jsonPath);
-            if (log) log(`Searching for typing names in '${jsonPath}' dependencies`);
-            const jsonConfig: PackageJson = readConfigFile(jsonPath, (path: string) => host.readFile(path)).config;
-            addInferredTypingsFromKeys(jsonConfig.dependencies);
-            addInferredTypingsFromKeys(jsonConfig.devDependencies);
-            addInferredTypingsFromKeys(jsonConfig.optionalDependencies);
-            addInferredTypingsFromKeys(jsonConfig.peerDependencies);
-
-            function addInferredTypingsFromKeys(map: MapLike<string> | undefined): void {
-                for (const key in map) {
-                    if (ts.hasProperty(map, key)) {
-                        addInferredTyping(key);
-                    }
-                }
-            }
+            const jsonConfig: PackageJson = readConfigFile(jsonPath, path => host.readFile(path)).config;
+            const jsonTypingNames = flatMap([jsonConfig.dependencies, jsonConfig.devDependencies, jsonConfig.optionalDependencies, jsonConfig.peerDependencies], getOwnKeys);
+            addInferredTypings(jsonTypingNames, `Typing names in '${jsonPath}' dependencies`);
         }
 
         /**
@@ -189,10 +176,7 @@ namespace ts.JsTyping {
                 return safeList.get(cleanedTypingName);
             });
             if (fromFileNames.length) {
-                if (log) log(`Inferred typings from file names: ${JSON.stringify(fromFileNames)}`);
-                for (const safe of fromFileNames) {
-                    addInferredTyping(safe);
-                }
+                addInferredTypings(fromFileNames, "Inferred typings from file names");
             }
 
             const hasJsxFile = some(fileNames, f => fileExtensionIs(f, Extension.Jsx));
@@ -217,6 +201,7 @@ namespace ts.JsTyping {
             // depth of 2, so we access `node_modules/foo` but not `node_modules/foo/bar`
             const fileNames = host.readDirectory(packagesFolderPath, [".json"], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 2);
             if (log) log(`Searching for typing names in ${packagesFolderPath}; all files: ${JSON.stringify(fileNames)}`);
+            const packageNames: string[] = [];
             for (const fileName of fileNames) {
                 const normalizedFileName = normalizePath(fileName);
                 const baseFileName = getBaseFileName(normalizedFileName);
@@ -239,14 +224,17 @@ namespace ts.JsTyping {
                 if (!packageJson.name) {
                     continue;
                 }
-                if (packageJson.typings) {
-                    const absolutePath = getNormalizedAbsolutePath(packageJson.typings, getDirectoryPath(normalizedFileName));
+                const ownTypes = packageJson.types || packageJson.typings;
+                if (ownTypes) {
+                    const absolutePath = getNormalizedAbsolutePath(ownTypes, getDirectoryPath(normalizedFileName));
+                    if (log) log(`    Package '${packageJson.name}' provides its own types.`);
                     inferredTypings.set(packageJson.name, absolutePath);
                 }
                 else {
-                    addInferredTyping(packageJson.name);
+                    packageNames.push(packageJson.name);
                 }
             }
+            addInferredTypings(packageNames, "    Found package names");
         }
 
     }