diff --git a/types/index.d.ts b/types/index.d.ts
index 52c2413..efbb88f 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -1,37 +1,47 @@
 import { Chalk } from 'chalk';
 
-export interface Spinner {
-  interval: number;
-  frames: string[];
-}
+declare namespace progressEstimator {
+  interface Spinner {
+    interval: number;
+    frames: string[];
+  }
 
-export interface ChalkTheme extends Chalk {
-  asciiCompleted: Chalk;
-  asciiInProgress: Chalk;
-  estimate: Chalk;
-  estimateExceeded: Chalk;
-  label: Chalk;
-  percentage: Chalk;
-  progressBackground: Chalk;
-  progressForeground: Chalk;
-}
+  interface ChalkTheme extends Chalk {
+    asciiCompleted: Chalk;
+    asciiInProgress: Chalk;
+    estimate: Chalk;
+    estimateExceeded: Chalk;
+    label: Chalk;
+    percentage: Chalk;
+    progressBackground: Chalk;
+    progressForeground: Chalk;
+  }
 
-export interface Configuration {
-  spinner?: Spinner;
-  storagePath?: string;
-  theme?: ChalkTheme;
-}
+  interface LogFunction {
+    (...text: string[]): void;
+    clear(): void;
+    done(): void;
+  }
+
+  interface Configuration {
+    logFunction?: LogFunction;
+    spinner?: Spinner;
+    storagePath?: string;
+    theme?: ChalkTheme;
+  }
+
+  interface LogOption {
+    estimate?: number;
+    id?: string;
+  }
 
-export interface ProgressEstimator {
-  <T>(promise: Promise<T>, label: string, estimatedDuration?: number): Promise<
-    T
-  >;
-  configure(options: Configuration): void;
-  logProgress: ProgressEstimator;
+  interface ProgressEstimator {
+    <T>(promise: Promise<T>, label: string, options?: LogOption): Promise<T>;
+  }
 }
 
-export declare const configure: (options: Configuration) => void;
-export declare const logProgress: ProgressEstimator;
+declare function progressEstimator(
+  config?: progressEstimator.Configuration
+): progressEstimator.ProgressEstimator;
 
-declare const progressEstimator: ProgressEstimator;
-export default progressEstimator;
+export = progressEstimator;
diff --git a/types/test.ts b/types/test.ts
index b452f63..07e6c41 100644
--- a/types/test.ts
+++ b/types/test.ts
@@ -1,5 +1,5 @@
 import chalk from 'chalk';
-import progressEstimator, { configure, logProgress, ChalkTheme } from '..';
+import createLogger, { ChalkTheme, LogFunction } from '..';
 
 // Test promises
 const stringPromise = new Promise<string>(resolve => resolve('hello'));
@@ -16,35 +16,42 @@ chalkTheme.percentage = chalkTheme;
 chalkTheme.progressBackground = chalkTheme;
 chalkTheme.progressForeground = chalkTheme;
 
-// Check `logProgress`
-const resultOne: Promise<string> = progressEstimator(
-  stringPromise,
-  'This promise has no initial estimate'
-);
-const resultTwo: Promise<number> = progressEstimator(
-  numberPromise,
-  'This promise is initially estimated to take 1 second',
-  1000
-);
-const resultThree: Promise<number> = logProgress(numberPromise, 'Valid export');
+// logFunction
+const logFunction: LogFunction = (...text: string[]) => {};
+logFunction.done = () => {};
+logFunction.clear = () => {};
 
-// Check `configure`
-configure({
-  spinner: { interval: 100, frames: ['.', ''] }
+// Check `createLogger`
+const logger = createLogger();
+createLogger({
+  spinner: {
+    interval: 100,
+    frames: ['.', '']
+  }
 });
-configure({
+createLogger({
   storagePath: 'path/to/dir'
 });
-configure({
+createLogger({
   theme: chalkTheme
 });
-configure({
-  spinner: { interval: 100, frames: ['.', ''] },
-  storagePath: 'path/to/dir',
-  theme: chalkTheme
+createLogger({
+  logFunction: logFunction
 });
-progressEstimator.configure({
+createLogger({
   spinner: { interval: 100, frames: ['.', ''] },
   storagePath: 'path/to/dir',
-  theme: chalkTheme
+  theme: chalkTheme,
+  logFunction: logFunction
 });
+
+const resultOne: Promise<string> = logger(
+  stringPromise,
+  'This promise has no initial estimate'
+);
+const resultTwo: Promise<number> = logger(
+  numberPromise,
+  'This promise is initially estimated to take 1 second',
+  { estimate: 1000 }
+);
+const resultThree: Promise<number> = logger(numberPromise, 'Valid export');
diff --git a/types/tsconfig.json b/types/tsconfig.json
index 40b17ad..57b19fd 100644
--- a/types/tsconfig.json
+++ b/types/tsconfig.json
@@ -2,10 +2,9 @@
   "compilerOptions": {
     "module": "commonjs",
     "target": "es6",
-    "lib": ["es2015"],
     "noImplicitAny": true,
     "noUnusedLocals": false,
     "noEmit": true,
-    "allowJs": true
+    "esModuleInterop": true
   }
 }