Use module resolution, rather than absolute path

Author: amcasey

src/jsTyping/jsTyping.ts

@@ -292,13 +292,19 @@ namespace ts.JsTyping {
                 }
                 const ownTypes = packageJson.types || packageJson.typings;
                 if (ownTypes) {
-                    const absolutePath = getNormalizedAbsolutePath(ownTypes, getDirectoryPath(normalizedFileName));
-                    if (host.fileExists(absolutePath)) {
+                    let typesPath: string | undefined;
+                    try {
+                        const result = resolveModuleName(ownTypes, getDirectoryPath(normalizedFileName), { moduleResolution: ModuleResolutionKind.NodeJs }, host);
+                        typesPath = result.resolvedModule && result.resolvedModule.resolvedFileName;
+                    }
+                    catch (e) {
+                    }
+                    if (typesPath) {
                         if (log) log(`    Package '${packageJson.name}' provides its own types.`);
-                        inferredTypings.set(packageJson.name, absolutePath);
+                        inferredTypings.set(packageJson.name, typesPath);
                     }
                     else {
-                         if (log) log(`    Package '${packageJson.name}' provides its own types but they are missing.`);
+                         if (log) log(`    Package '${packageJson.name}' provides its own types but they could not be resolved.`);
                     }
                 }
                 else {