diff --git a/packages/core/index.d.ts b/packages/core/index.d.ts
new file mode 100644
index 00000000..299cf5b6
--- /dev/null
+++ b/packages/core/index.d.ts
@@ -0,0 +1,26 @@
+// Type definitions for @webpack-blocks/core 1.0.0
+// Project: webpack-blocks
+// Definitions by: Stephan Schneider <https://github.com/zcei>
+
+import { Configuration as WebpackConfig, Condition, Rule, Plugin } from 'webpack'
+
+export function createConfig(configSetter: WebpackBlock[]): object
+export function group(configSetters: WebpackBlock[]): WebpackBlock
+export function env(envName: string, configSetters: WebpackBlock[]): WebpackBlock
+export function match(test: Condition | Condition[], configSetters: Function[]): Function
+
+
+export interface WebpackBlock {
+  (context: Object, util: WebpackBlockUtils): WebpackBlockUpdater
+}
+
+export interface WebpackBlockUpdater {
+  (previousConfig: WebpackConfig): WebpackConfig
+}
+
+/*~ You can declare types that are available via importing the module */
+export interface WebpackBlockUtils {
+    merge: (configSnippet: WebpackConfig) => WebpackBlockUpdater
+    addLoader: (loader: Rule) => WebpackBlockUpdater
+    addPlugin: (plugin: Plugin) => WebpackBlockUpdater
+}
diff --git a/packages/webpack/index.d.ts b/packages/webpack/index.d.ts
new file mode 100644
index 00000000..dca6269a
--- /dev/null
+++ b/packages/webpack/index.d.ts
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+// Type definitions for @webpack-blocks/webpack 1.0.0
+// Project: webpack-blocks
+// Definitions by: Stephan Schneider <https://github.com/zcei>
+
+import {
+  createConfig,
+  group,
+  env,
+  match,
+  WebpackBlock,
+  WebpackBlockUpdater
+} from '@webpack-blocks/core'
+import { Configuration, Plugin, Entry, Options, Resolve, Output } from 'webpack'
+export { createConfig, group, env, match }
+
+export function addPlugins(plugins: Plugin[]): WebpackBlock
+export function customConfig(configSnippet: Configuration): WebpackBlockUpdater
+export function defineConstants(constants: { [key: string]: any }): WebpackBlock
+export function setEnv(envs: string[] | { [key: string]: any }): WebpackBlock
+// TODO: support EntryFunc
+export function entryPoint(entry: string | string[] | Entry): WebpackBlock
+export function performance(perfBudgetOptions: Options.Performance): WebpackBlock
+export function resolve(config: Resolve): WebpackBlock
+export function setContext(path: string): WebpackBlock
+export function setDevTool(devtool: Options.Devtool): WebpackBlock
+export function setOutput(output: string | Output): WebpackBlock
+export function sourceMaps(devtool?: Options.Devtool): WebpackBlock