diff --git a/types/cosmiconfig/cosmiconfig-tests.ts b/types/cosmiconfig/cosmiconfig-tests.ts
index 2676c58407..632569c6f9 100644
--- a/types/cosmiconfig/cosmiconfig-tests.ts
+++ b/types/cosmiconfig/cosmiconfig-tests.ts
@@ -1,41 +1,23 @@
-import cosmiconfig = require("cosmiconfig");
+import cosmiconfig, { CosmiconfigResult } from "cosmiconfig";
+import * as path from "path";
 
-const asyncExplorer = cosmiconfig("yourModuleName", {
-    packageProp: "yourModuleName",
-    rc: ".yourModuleNamerc",
-    js: "yourModuleName.config.js",
-    rcStrictJson: false,
-    rcExtensions: false,
-    stopDir: "someDir",
-    cache: true,
-    sync: false,
-    transform: ({ config, filePath }) => ({ config, filePath }),
-    format: "js"
+const explorer = cosmiconfig("yourModuleName", {
+  searchPlaces: [],
+  loaders: {},
+  packageProp: "yourModuleName",
+  stopDir: "someDir",
+  cache: true,
+  transform: (result: CosmiconfigResult) => result,
+  ignoreEmptySearchPlaces: false,
 });
 
 Promise.all([
-    asyncExplorer.load(),
-    asyncExplorer.load("start/search/here"),
-    asyncExplorer.load(null, "load/this/file.json")
+  explorer.search(path.join(__dirname)),
+  explorer.searchSync(path.join(__dirname)),
+  explorer.load(path.join(__dirname, "sample-config.json")),
+  explorer.loadSync(path.join(__dirname, "sample-config.json")),
 ]).then(result => result);
 
-asyncExplorer.load().then(({ config, filePath }) => ({ config, filePath }));
-
-asyncExplorer.clearFileCache();
-asyncExplorer.clearDirectoryCache();
-asyncExplorer.clearCaches();
-
-const syncExplorer = cosmiconfig("yourModuleName", {
-    packageProp: "yourModuleName",
-    rc: ".yourModuleNamerc",
-    js: "yourModuleName.config.js",
-    rcStrictJson: false,
-    rcExtensions: false,
-    stopDir: "someDir",
-    cache: true,
-    sync: true,
-    transform: ({ config, filePath }) => ({ config, filePath }),
-    format: "js"
-});
-
-const { config, filePath } = syncExplorer.load();
+explorer.clearLoadCache();
+explorer.clearSearchCache();
+explorer.clearCaches();
diff --git a/types/cosmiconfig/index.d.ts b/types/cosmiconfig/index.d.ts
index 032f570d6f..bdafc922ec 100644
--- a/types/cosmiconfig/index.d.ts
+++ b/types/cosmiconfig/index.d.ts
@@ -1,63 +1,58 @@
-// Type definitions for cosmiconfig 4.0
+// Type definitions for cosmiconfig 5.0
 // Project: https://github.com/davidtheclark/cosmiconfig
 // Definitions by: ozum <https://github.com/ozum>
+//                 szeck87 <https://github.com/szeck87>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.2
 
-interface Result {
-    config: object;
-    filePath: string;
+/// <reference types="node" />
+
+export interface Config {
+  [key: string]: any;
 }
 
-interface Options {
-    packageProp?: string | false;
-    rc?: string | false;
-    js?: string | false;
-    rcStrictJson?: boolean;
-    rcExtensions?: boolean;
-    stopDir?: string;
-    cache?: boolean;
-    transform?: (result: Result) => Promise<Result> | Result;
-    configPath?: string;
-    format?: "json" | "yaml" | "js";
+export type CosmiconfigResult = {
+  config: Config;
+  filePath: string;
+  isEmpty?: boolean;
+} | null;
+
+export interface LoaderResult {
+  config: Config | null;
+  filepath: string;
 }
 
-// Default is false and makes load() method async
-interface AsyncOptions extends Options {
-    sync?: false;
+export type SyncLoader = (filepath: string, content: string) => Config | null;
+export type AsyncLoader = (filepath: string, content: string) => Config | null | Promise<object | null>;
+
+export interface LoaderEntry {
+  sync?: SyncLoader;
+  async?: AsyncLoader;
 }
 
-// Makes load() method sync
-interface SyncOptions extends Options {
-    sync: true;
+export interface Loaders {
+  [key: string]: LoaderEntry;
 }
 
-interface Explorer {
-    clearFileCache(): void;
-    clearDirectoryCache(): void;
-    clearCaches(): void;
+export interface Explorer {
+  search(searchFrom: string): Promise<null | CosmiconfigResult>;
+  searchSync(searchFrom: string): null | CosmiconfigResult;
+  load(loadPath: string): Promise<CosmiconfigResult>;
+  loadSync(loadPath: string): CosmiconfigResult;
+  clearLoadCache(): void;
+  clearSearchCache(): void;
+  clearCaches(): void;
 }
 
-interface AsyncExplorer extends Explorer {
-    // You should provide either searchPath or configPath for load method. To disallow both, overloaded definitions added.
-    load(searchPath?: string): Promise<Result>;
-    load(searchPath: null | undefined, configPath?: string): Promise<Result>;
+// These are the user options with defaults applied.
+export interface ExplorerOptions {
+  stopDir?: string;
+  cache?: boolean;
+  transform?: (result: CosmiconfigResult) => Promise<CosmiconfigResult> | CosmiconfigResult;
+  packageProp?: string;
+  loaders?: Loaders;
+  searchPlaces?: string[];
+  ignoreEmptySearchPlaces?: boolean;
 }
 
-interface SyncExplorer extends Explorer {
-    // You should provide either searchPath or configPath for load method. To disallow both, overloaded definitions added.
-    load(searchPath?: string): Result;
-    load(searchPath: null | undefined, configPath?: string): Result;
-}
-
-declare function cosmiconfig(
-    moduleName: string,
-    options: SyncOptions
-): SyncExplorer;
-
-declare function cosmiconfig(
-    moduleName: string,
-    options?: AsyncOptions
-): AsyncExplorer;
-
-export = cosmiconfig;
+export default function cosmiconfig(moduleName: string, options: ExplorerOptions): Explorer;
diff --git a/types/cosmiconfig/v4/cosmiconfig-tests.ts b/types/cosmiconfig/v4/cosmiconfig-tests.ts
new file mode 100644
index 0000000000..2676c58407
--- /dev/null
+++ b/types/cosmiconfig/v4/cosmiconfig-tests.ts
@@ -0,0 +1,41 @@
+import cosmiconfig = require("cosmiconfig");
+
+const asyncExplorer = cosmiconfig("yourModuleName", {
+    packageProp: "yourModuleName",
+    rc: ".yourModuleNamerc",
+    js: "yourModuleName.config.js",
+    rcStrictJson: false,
+    rcExtensions: false,
+    stopDir: "someDir",
+    cache: true,
+    sync: false,
+    transform: ({ config, filePath }) => ({ config, filePath }),
+    format: "js"
+});
+
+Promise.all([
+    asyncExplorer.load(),
+    asyncExplorer.load("start/search/here"),
+    asyncExplorer.load(null, "load/this/file.json")
+]).then(result => result);
+
+asyncExplorer.load().then(({ config, filePath }) => ({ config, filePath }));
+
+asyncExplorer.clearFileCache();
+asyncExplorer.clearDirectoryCache();
+asyncExplorer.clearCaches();
+
+const syncExplorer = cosmiconfig("yourModuleName", {
+    packageProp: "yourModuleName",
+    rc: ".yourModuleNamerc",
+    js: "yourModuleName.config.js",
+    rcStrictJson: false,
+    rcExtensions: false,
+    stopDir: "someDir",
+    cache: true,
+    sync: true,
+    transform: ({ config, filePath }) => ({ config, filePath }),
+    format: "js"
+});
+
+const { config, filePath } = syncExplorer.load();
diff --git a/types/cosmiconfig/v4/index.d.ts b/types/cosmiconfig/v4/index.d.ts
new file mode 100644
index 0000000000..032f570d6f
--- /dev/null
+++ b/types/cosmiconfig/v4/index.d.ts
@@ -0,0 +1,63 @@
+// Type definitions for cosmiconfig 4.0
+// Project: https://github.com/davidtheclark/cosmiconfig
+// Definitions by: ozum <https://github.com/ozum>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+interface Result {
+    config: object;
+    filePath: string;
+}
+
+interface Options {
+    packageProp?: string | false;
+    rc?: string | false;
+    js?: string | false;
+    rcStrictJson?: boolean;
+    rcExtensions?: boolean;
+    stopDir?: string;
+    cache?: boolean;
+    transform?: (result: Result) => Promise<Result> | Result;
+    configPath?: string;
+    format?: "json" | "yaml" | "js";
+}
+
+// Default is false and makes load() method async
+interface AsyncOptions extends Options {
+    sync?: false;
+}
+
+// Makes load() method sync
+interface SyncOptions extends Options {
+    sync: true;
+}
+
+interface Explorer {
+    clearFileCache(): void;
+    clearDirectoryCache(): void;
+    clearCaches(): void;
+}
+
+interface AsyncExplorer extends Explorer {
+    // You should provide either searchPath or configPath for load method. To disallow both, overloaded definitions added.
+    load(searchPath?: string): Promise<Result>;
+    load(searchPath: null | undefined, configPath?: string): Promise<Result>;
+}
+
+interface SyncExplorer extends Explorer {
+    // You should provide either searchPath or configPath for load method. To disallow both, overloaded definitions added.
+    load(searchPath?: string): Result;
+    load(searchPath: null | undefined, configPath?: string): Result;
+}
+
+declare function cosmiconfig(
+    moduleName: string,
+    options: SyncOptions
+): SyncExplorer;
+
+declare function cosmiconfig(
+    moduleName: string,
+    options?: AsyncOptions
+): AsyncExplorer;
+
+export = cosmiconfig;
diff --git a/types/cosmiconfig/v4/tsconfig.json b/types/cosmiconfig/v4/tsconfig.json
new file mode 100644
index 0000000000..f0c8707c16
--- /dev/null
+++ b/types/cosmiconfig/v4/tsconfig.json
@@ -0,0 +1,19 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../../",
+        "typeRoots": ["../../"],
+        "paths": {
+          "cosmiconfig": [ "cosmiconfig/v4" ]          
+        },
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": ["index.d.ts", "cosmiconfig-tests.ts"]
+}
diff --git a/types/cosmiconfig/v4/tslint.json b/types/cosmiconfig/v4/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/cosmiconfig/v4/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }