diff --git a/types/poi/index.d.ts b/types/poi/index.d.ts
new file mode 100644
index 0000000000..f8e346ed9f
--- /dev/null
+++ b/types/poi/index.d.ts
@@ -0,0 +1,243 @@
+// Type definitions for poi 12.5
+// Project: https://github.com/egoist/poi/
+// Definitions by: c4605 <https://github.com/bolasblack>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import { ICompiler, Configuration as WebpackConfig } from "webpack";
+import { Configuration as WebpackDevServerConfig } from "webpack-dev-server";
+import { Options as HtmlWebpackPluginOptions } from "html-webpack-plugin";
+import * as WebpackChainConfig from "webpack-chain";
+import CAC from "cac/types/CAC";
+
+/**
+ * https://poi.js.org/api.html#constructor-argv
+ */
+declare class PoiCore {
+    mode: PoiCore.Mode;
+
+    cli: CAC;
+
+    /** The current running command */
+    command: CAC["command"];
+
+    config: PoiCore.Config;
+
+    isProd: boolean;
+
+    configLoader: PoiCore.ConfigLoader;
+
+    constructor(argv?: string[]);
+
+    /** Check if a package is included in the `dependencies` or `devDependencies` field your `package.json` */
+    hasDependency(name: string): boolean;
+
+    hasPlugin(name: string): boolean;
+
+    hook(hookName: string, handler: PoiCore.HookHandler): void;
+
+    resolveCwd(...args: string[]): string;
+
+    resolveOutDir(...args: string[]): string;
+
+    run(): Promise<void>;
+
+    getCacheConfig(
+        dir: string,
+        keys: { [k: string]: string },
+        files: ReadonlyArray<string>
+    ): {
+        cacheDirectory: string;
+        cacheIdentifier: string;
+    };
+
+    createWebpackChain(opts?: { [k: string]: any }): WebpackChainConfig;
+
+    createWebpackCompiler(config: WebpackConfig): ICompiler;
+
+    localResolve(pkg: string, cwd?: string): string | null;
+
+    localRequire(pkg: string, cwd?: string): any;
+}
+
+declare namespace PoiCore {
+    type Mode = "production" | "development" | "test";
+
+    interface Opts {
+        type: string;
+        mode: Mode;
+        [k: string]: any;
+    }
+
+    /**
+     * https://poi.js.org/config.html
+     */
+    interface Config {
+        entry?: Config.Entry;
+        output?: Config.Output;
+        pages?: Config.Pages;
+        babel?: Config.Babel;
+        css?: Config.Css;
+        assets?: Config.Assets;
+        envs?: Config.Envs;
+        constants?: Config.Constants;
+        chainWebpack?: Config.ChainWebpack;
+        configureWebpack?: Config.ConfigureWebpack;
+        publicFolder?: Config.PublicFolder;
+        devServer?: Config.DevServer;
+        plugins?: Config.Plugins;
+    }
+
+    namespace Config {
+        type Entry = WebpackConfig["entry"];
+
+        interface Output {
+            dir?: string;
+            clean?: boolean;
+            format?: "iife" | "cjs" | "umd";
+            moduleName?: string;
+            sourceMap?: boolean;
+            minimize?: boolean;
+            publicUrl?: string;
+            fileNames?: Output.FileNames;
+            target?:
+                | "web"
+                | "electron"
+                | "electron-renderer"
+                | "electron-main"
+                | "node"
+                | "node-webkit"
+                | "async-node"
+                | "webworker";
+            html?: Output.Html;
+        }
+        namespace Output {
+            interface FileNames {
+                js?: string;
+                css?: string;
+                font?: string;
+                image?: string;
+            }
+
+            interface HtmlOptions {
+                title?: string;
+                filename?: string;
+                template?: string;
+                inject?: boolean;
+            }
+
+            type Html = boolean | HtmlOptions;
+        }
+
+        interface Pages {
+            [pageName: string]:
+                | string
+                | Partial<HtmlWebpackPluginOptions> & {
+                      entry: string;
+                      chunks?: string[];
+                  };
+        }
+
+        interface Babel {
+            jsx?: string;
+            transpileModules?: string | string[];
+            namedImports?: string | Babel.NamedImportsOptions;
+        }
+        namespace Babel {
+            interface NamedImportsOptions {
+                [fileExt: string]: {
+                    [ComponentName: string]: string;
+                };
+            }
+        }
+
+        interface Css {
+            extract?: boolean;
+            sourceMap?: boolean;
+            loaderOptions?: Css.LoaderOptions;
+        }
+        namespace Css {
+            interface LoaderOptions {
+                css?: any;
+                sass?: any;
+                postcss?: any;
+                less?: any;
+                stylus?: any;
+            }
+        }
+
+        interface Assets {
+            inlineImageMaxSize?: number;
+        }
+
+        interface Envs {
+            [envName: string]: string;
+        }
+
+        interface Constants {
+            [constantName: string]: string;
+        }
+
+        interface ChainWebpack {
+            (config: WebpackChainConfig, opts: Opts): void;
+        }
+
+        type ConfigureWebpack =
+            | WebpackConfig
+            | ((config: WebpackConfig, opts: Opts) => void | WebpackConfig);
+
+        type PublicFolder = string | boolean;
+
+        interface DevServer {
+            host?: string;
+            port?: string | number;
+            hot?: boolean;
+            hotOnly?: boolean;
+            hotEntries?: string[];
+            historyApiFallback?: WebpackDevServerConfig["historyApiFallback"];
+            open?: boolean;
+            proxy?: string | WebpackDevServerConfig["proxy"];
+            https?: WebpackDevServerConfig["https"];
+            before?: WebpackDevServerConfig["before"];
+            after?: WebpackDevServerConfig["after"];
+            headers?: WebpackDevServerConfig["headers"];
+        }
+
+        interface PluginOption {
+            resolve: string;
+            options?: any;
+        }
+        type Plugins = Array<string | PluginOption>;
+    }
+
+    interface ConfigLoader {
+        resolve(
+            files?: ReadonlyArray<string>,
+            cwd?: string,
+            stopDir?: string
+        ): string | null;
+        resolve(options?: ConfigLoader.Options): string | null;
+
+        load(
+            files?: ReadonlyArray<string>,
+            cwd?: string,
+            stopDir?: string
+        ): any;
+        load(options?: ConfigLoader.Options): any;
+    }
+    namespace ConfigLoader {
+        interface Options {
+            files?: string[];
+            cwd?: string;
+            stopDir?: string;
+            packageKey?: string;
+            parseJSON?: (str: string) => any;
+        }
+    }
+
+    interface HookHandler {
+        (config: WebpackChainConfig, opts: Opts): void;
+    }
+}
+
+export = PoiCore;
diff --git a/types/poi/package.json b/types/poi/package.json
new file mode 100644
index 0000000000..54a71aeaf1
--- /dev/null
+++ b/types/poi/package.json
@@ -0,0 +1,7 @@
+{
+    "private": true,
+    "dependencies": {
+        "cac": "~6.4.2",
+        "webpack-chain": "^5.2.4"
+    }
+}
diff --git a/types/poi/poi-tests.ts b/types/poi/poi-tests.ts
new file mode 100644
index 0000000000..82be4a2d49
--- /dev/null
+++ b/types/poi/poi-tests.ts
@@ -0,0 +1,3 @@
+import * as PoiCore from "poi";
+
+const poi = new PoiCore();
diff --git a/types/poi/tsconfig.json b/types/poi/tsconfig.json
new file mode 100644
index 0000000000..b73cda1e27
--- /dev/null
+++ b/types/poi/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "poi-tests.ts"
+    ]
+}
diff --git a/types/poi/tslint.json b/types/poi/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/poi/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }