diff --git a/packages/types/config/module.d.ts b/packages/types/config/module.d.ts
index fb97c8f1de..c60245b6bf 100644
--- a/packages/types/config/module.d.ts
+++ b/packages/types/config/module.d.ts
@@ -6,6 +6,8 @@
 
 import { Configuration as WebpackConfiguration } from 'webpack'
 import { NuxtOptionsLoaders } from './build'
+import { NuxtRouteConfig } from './router'
+import { NuxtOptionsServerMiddleware } from './server-middleware'
 import { NuxtOptions } from '.'
 
 interface ExtendFunctionContext {
@@ -17,10 +19,43 @@ interface ExtendFunctionContext {
   loaders: NuxtOptionsLoaders
 }
 
-type ExtendFunction = (config: WebpackConfiguration, ctx: ExtendFunctionContext) => void
+export interface ModuleTemplateConfig {
+  src: string,
+  fileName?: string
+  filename?: string
+  options?: Record<string, any>
+  [key: string]: any
+}
+
+export interface ModulePluginTemplateConfig extends ModuleTemplateConfig {
+  ssr?: boolean
+  mode?: 'all' | 'client' | 'server'
+}
+
+export interface ModuleTemplateDest {
+  src: string
+  dst: string
+  options?: Record<string, any>
+}
+
+export type ModuleTemplate = ModuleTemplateConfig | string
+export type ModulePluginTemplate = ModulePluginTemplateConfig | string
+
+type ExtendRoutesFunction = (routes: NuxtRouteConfig[], resolve: (...pathSegments: string[]) => string) => void
+type ExtendBuildFunction = (config: WebpackConfiguration, ctx: ExtendFunctionContext) => void
 
 interface ModuleThis {
-  extendBuild(fn: ExtendFunction): void
+  addTemplate(template: ModuleTemplate): ModuleTemplateDest
+  addPlugin(template: ModulePluginTemplate): void
+  addLayout(template: ModuleTemplate, name?: string): void
+  addErrorLayout (dst: string): void
+  addServerMiddleware (middleware: NuxtOptionsServerMiddleware): void
+  extendBuild(fn: ExtendBuildFunction): void
+  extendRoutes(fn: ExtendRoutesFunction): void
+  // eslint-disable-next-line no-use-before-define
+  requireModule (moduleOpts: NuxtOptionsModule, paths?: string[]): Promise<any>
+  // eslint-disable-next-line no-use-before-define
+  addModule (moduleOpts: NuxtOptionsModule, paths?: string[]): Promise<any>
   options: NuxtOptions
   nuxt: any // TBD
   [key: string]: any // TBD