diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index d714ffdf..d3c06978 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -12,7 +12,13 @@ module.exports = {
   parserOptions: {
     project: ["./tsconfig.json"]
   },
-  ignorePatterns: ["scripts/**/*", "plugin-runtime/**/*", "src-tauri/**/*", "plugins/**/*"],
+  ignorePatterns: [
+    "scripts/**/*",
+    "plugin-runtime/**/*",
+    "plugin-runtime-types/**/*",
+    "src-tauri/**/*",
+    "plugins/**/*",
+  ],
   settings: {
     react: {
       version: "detect"
diff --git a/plugin-runtime-types/.gitignore b/plugin-runtime-types/.gitignore
new file mode 100644
index 00000000..3063f07d
--- /dev/null
+++ b/plugin-runtime-types/.gitignore
@@ -0,0 +1,2 @@
+lib
+node_modules
diff --git a/plugin-runtime-types/package-lock.json b/plugin-runtime-types/package-lock.json
new file mode 100644
index 00000000..1ef3d1b5
--- /dev/null
+++ b/plugin-runtime-types/package-lock.json
@@ -0,0 +1,44 @@
+{
+  "name": "@yaakapp/api",
+  "version": "0.0.1",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@yaakapp/api",
+      "version": "0.0.1",
+      "devDependencies": {
+        "@types/node": "^22.0.0",
+        "typescript": "^5.5.4"
+      }
+    },
+    "node_modules/@types/node": {
+      "version": "22.0.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.0.0.tgz",
+      "integrity": "sha512-VT7KSYudcPOzP5Q0wfbowyNLaVR8QWUdw+088uFWwfvpY6uCWaXpqV6ieLAu9WBcnTa7H4Z5RLK8I5t2FuOcqw==",
+      "dev": true,
+      "dependencies": {
+        "undici-types": "~6.11.1"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.5.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.4.tgz",
+      "integrity": "sha512-Mtq29sKDAEYP7aljRgtPOpTvOfbwRWlS6dPRzwjdE+C0R4brX/GUyhHSecbHMFLNBLcJIPt9nl9yG5TZ1weH+Q==",
+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "6.11.1",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.11.1.tgz",
+      "integrity": "sha512-mIDEX2ek50x0OlRgxryxsenE5XaQD4on5U2inY7RApK3SOJpofyw7uW2AyfMKkhAxXIceo2DeWGVGwyvng1GNQ==",
+      "dev": true
+    }
+  }
+}
diff --git a/plugin-runtime-types/package.json b/plugin-runtime-types/package.json
new file mode 100644
index 00000000..d9cb6a91
--- /dev/null
+++ b/plugin-runtime-types/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "@yaakapp/api",
+  "version": "0.0.5",
+  "main": "lib/index.js",
+  "typings": "./lib/index.d.ts",
+  "files": [
+    "lib"
+  ],
+  "scripts": {
+    "prepublish": "tsc"
+  },
+  "dependencies": {
+    "@types/node": "^22.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.5.4"
+  }
+}
diff --git a/plugin-runtime-types/src/helpers.ts b/plugin-runtime-types/src/helpers.ts
new file mode 100644
index 00000000..be548943
--- /dev/null
+++ b/plugin-runtime-types/src/helpers.ts
@@ -0,0 +1,2 @@
+export type AtLeast<T, K extends keyof T> = Partial<T> & Pick<T, K>;
+export type SingleOrArray<T> = T[] | T;
diff --git a/plugin-runtime-types/src/index.ts b/plugin-runtime-types/src/index.ts
new file mode 100644
index 00000000..7f2551d3
--- /dev/null
+++ b/plugin-runtime-types/src/index.ts
@@ -0,0 +1,3 @@
+export type * from './models';
+export type * from './plugins';
+export type * from './themes';
diff --git a/plugin-runtime-types/src/models/index.ts b/plugin-runtime-types/src/models/index.ts
new file mode 100644
index 00000000..fcb073fe
--- /dev/null
+++ b/plugin-runtime-types/src/models/index.ts
@@ -0,0 +1 @@
+export * from './types';
diff --git a/plugin-runtime-types/src/models/types.ts b/plugin-runtime-types/src/models/types.ts
new file mode 100644
index 00000000..e5c8f0ed
--- /dev/null
+++ b/plugin-runtime-types/src/models/types.ts
@@ -0,0 +1,135 @@
+export interface BaseModel {
+  readonly model: string;
+  readonly id: string;
+  readonly createdAt: string;
+  readonly updatedAt: string;
+}
+
+export interface Workspace extends BaseModel {
+  readonly model: 'workspace';
+  name: string;
+  description: string;
+  variables: EnvironmentVariable[];
+  settingValidateCertificates: boolean;
+  settingFollowRedirects: boolean;
+  settingRequestTimeout: number;
+}
+
+export interface EnvironmentVariable {
+  name: string;
+  value: string;
+  enabled?: boolean;
+}
+
+export interface Folder extends BaseModel {
+  readonly workspaceId: string;
+  readonly model: 'folder';
+  folderId: string | null;
+  sortPriority: number;
+  name: string;
+}
+
+export interface Environment extends BaseModel {
+  readonly workspaceId: string;
+  readonly model: 'environment';
+  name: string;
+  variables: EnvironmentVariable[];
+}
+
+export interface HttpHeader {
+  name: string;
+  value: string;
+  enabled?: boolean;
+}
+
+export interface HttpUrlParameter {
+  name: string;
+  value: string;
+  enabled?: boolean;
+}
+
+export interface GrpcMetadataEntry {
+  name: string;
+  value: string;
+  enabled?: boolean;
+}
+
+export interface GrpcRequest extends BaseModel {
+  readonly workspaceId: string;
+  readonly model: 'grpc_request';
+  folderId: string | null;
+  sortPriority: number;
+  name: string;
+  url: string;
+  service: string | null;
+  method: string | null;
+  message: string;
+  authentication: Record<string, string | number | boolean | null | undefined>;
+  authenticationType: string | null;
+  metadata: GrpcMetadataEntry[];
+}
+
+export interface GrpcEvent extends BaseModel {
+  readonly workspaceId: string;
+  readonly requestId: string;
+  readonly connectionId: string;
+  readonly model: 'grpc_event';
+  content: string;
+  status: number | null;
+  error: string | null;
+  eventType:
+    | 'info'
+    | 'error'
+    | 'client_message'
+    | 'server_message'
+    | 'connection_start'
+    | 'connection_end';
+  metadata: Record<string, string>;
+}
+
+export interface GrpcConnection extends BaseModel {
+  readonly workspaceId: string;
+  readonly requestId: string;
+  readonly model: 'grpc_connection';
+  service: string;
+  method: string;
+  elapsed: number;
+  elapsedConnection: number;
+  status: number;
+  url: string;
+  error: string | null;
+  trailers: Record<string, string>;
+}
+
+export interface HttpRequest extends BaseModel {
+  readonly workspaceId: string;
+  readonly model: 'http_request';
+  folderId: string | null;
+  sortPriority: number;
+  name: string;
+  url: string;
+  urlParameters: HttpUrlParameter[];
+  body: Record<string, unknown>;
+  bodyType: string | null;
+  authentication: Record<string, string | number | boolean | null | undefined>;
+  authenticationType: string | null;
+  method: string;
+  headers: HttpHeader[];
+}
+
+export interface HttpResponse extends BaseModel {
+  readonly workspaceId: string;
+  readonly model: 'http_response';
+  readonly requestId: string;
+  readonly bodyPath: string | null;
+  readonly contentLength: number | null;
+  readonly error: string;
+  readonly status: number;
+  readonly elapsed: number;
+  readonly elapsedHeaders: number;
+  readonly statusReason: string;
+  readonly version: string;
+  readonly remoteAddr: string;
+  readonly url: string;
+  readonly headers: HttpHeader[];
+}
diff --git a/plugin-runtime-types/src/plugins/context.ts b/plugin-runtime-types/src/plugins/context.ts
new file mode 100644
index 00000000..5f5f9f76
--- /dev/null
+++ b/plugin-runtime-types/src/plugins/context.ts
@@ -0,0 +1,11 @@
+import { HttpRequest, HttpResponse } from '../models';
+
+export type YaakContext = {
+  metadata: {
+    getVersion(): Promise<string>;
+  };
+  httpRequest: {
+    send(id: string): Promise<HttpResponse>;
+    getById(id: string): Promise<HttpRequest | null>;
+  };
+};
diff --git a/plugin-runtime-types/src/plugins/import.ts b/plugin-runtime-types/src/plugins/import.ts
new file mode 100644
index 00000000..6868ef3f
--- /dev/null
+++ b/plugin-runtime-types/src/plugins/import.ts
@@ -0,0 +1,16 @@
+import { AtLeast } from '../helpers';
+import { Environment, Folder, HttpRequest, Workspace } from '../models';
+import { YaakContext } from './context';
+
+export type ImportPluginResponse = null | {
+  resources: Partial<{
+    workspaces: AtLeast<Workspace, 'name' | 'id' | 'model'>[];
+    environments: AtLeast<Environment, 'name' | 'id' | 'model' | 'workspaceId'>[];
+    httpRequests: AtLeast<HttpRequest, 'name' | 'id' | 'model' | 'workspaceId'>[];
+    folders: AtLeast<Folder, 'name' | 'id' | 'model' | 'workspaceId'>[];
+  }>;
+};
+
+export type ImporterPlugin = {
+  onImport(ctx: YaakContext, fileContents: string): Promise<ImportPluginResponse>;
+};
diff --git a/plugin-runtime-types/src/plugins/index.ts b/plugin-runtime-types/src/plugins/index.ts
new file mode 100644
index 00000000..e6716db9
--- /dev/null
+++ b/plugin-runtime-types/src/plugins/index.ts
@@ -0,0 +1,13 @@
+import { SingleOrArray } from '../helpers';
+import { ImporterPlugin } from './import';
+import { ThemePlugin } from './theme';
+
+/**
+ * The global structure of a Yaak plugin
+ */
+export type YaakPlugin = {
+  /** One or many plugins to import data into Yaak */
+  importers?: SingleOrArray<ImporterPlugin>;
+  /** One or many themes to customize the Yaak UI */
+  themes?: SingleOrArray<ThemePlugin>;
+};
diff --git a/plugin-runtime-types/src/plugins/theme.ts b/plugin-runtime-types/src/plugins/theme.ts
new file mode 100644
index 00000000..fb8b2312
--- /dev/null
+++ b/plugin-runtime-types/src/plugins/theme.ts
@@ -0,0 +1,5 @@
+import { Theme } from '../themes';
+
+export type ThemePlugin = {
+  theme: Theme;
+};
diff --git a/plugin-runtime-types/src/themes/index.ts b/plugin-runtime-types/src/themes/index.ts
new file mode 100644
index 00000000..40412dc7
--- /dev/null
+++ b/plugin-runtime-types/src/themes/index.ts
@@ -0,0 +1,44 @@
+export type Colors = {
+  surface: string;
+  surfaceHighlight?: string;
+  surfaceActive?: string;
+
+  text: string;
+  textSubtle?: string;
+  textSubtlest?: string;
+
+  border?: string;
+  borderSubtle?: string;
+  borderFocus?: string;
+
+  shadow?: string;
+  backdrop?: string;
+  selection?: string;
+
+  primary?: string;
+  secondary?: string;
+  info?: string;
+  success?: string;
+  notice?: string;
+  warning?: string;
+  danger?: string;
+};
+
+export type Theme = Colors & {
+  id: string;
+  name: string;
+  components?: Partial<{
+    dialog: Partial<Colors>;
+    menu: Partial<Colors>;
+    toast: Partial<Colors>;
+    sidebar: Partial<Colors>;
+    responsePane: Partial<Colors>;
+    appHeader: Partial<Colors>;
+    button: Partial<Colors>;
+    banner: Partial<Colors>;
+    placeholder: Partial<Colors>;
+    urlBar: Partial<Colors>;
+    editor: Partial<Colors>;
+    input: Partial<Colors>;
+  }>;
+};
diff --git a/plugin-runtime-types/tsconfig.json b/plugin-runtime-types/tsconfig.json
new file mode 100644
index 00000000..afa6c5f8
--- /dev/null
+++ b/plugin-runtime-types/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "module": "node16",
+    "target": "es6",
+    "lib": ["es2021"],
+    "declaration": true,
+    "declarationDir": "./lib",
+    "outDir": "./lib",
+    "strict": true,
+    "types": ["node"]
+  },
+  "files": [
+    "src/index.ts"
+  ]
+}
diff --git a/plugin-runtime/tsconfig.json b/plugin-runtime/tsconfig.json
index a3217bba..9ccaccf0 100644
--- a/plugin-runtime/tsconfig.json
+++ b/plugin-runtime/tsconfig.json
@@ -11,7 +11,6 @@
     "sourceMap": true,
     "outDir": "dist",
     "baseUrl": ".",
-    "skipLibCheck": true,
     "paths": {
       "*": [
         "node_modules/*",
diff --git a/src-web/index.d.ts b/src-web/index.d.ts
deleted file mode 100644
index 6e7077f3..00000000
--- a/src-web/index.d.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-declare module 'format-graphql' {
-  export function formatSdl(query: string): string;
-}
-
-declare module '*.svg' {
-  export const ReactComponent: React.FunctionComponent<React.SVGAttributes<SVGElement>>;
-}
diff --git a/src-web/lib/models.ts b/src-web/lib/models.ts
index afe4df5e..fe0299de 100644
--- a/src-web/lib/models.ts
+++ b/src-web/lib/models.ts
@@ -1,3 +1,18 @@
+import type {
+  BaseModel,
+  Workspace,
+  HttpResponse,
+  HttpRequest,
+  HttpHeader,
+  Folder,
+  GrpcRequest,
+  GrpcEvent,
+  GrpcConnection,
+  Environment,
+} from '../../plugin-runtime-types';
+
+export * from '../../plugin-runtime-types';
+
 export const BODY_TYPE_NONE = null;
 export const BODY_TYPE_GRAPHQL = 'graphql';
 export const BODY_TYPE_JSON = 'application/json';
@@ -24,12 +39,6 @@ export type Model =
   | Environment
   | CookieJar;
 
-export interface BaseModel {
-  readonly id: string;
-  readonly createdAt: string;
-  readonly updatedAt: string;
-}
-
 export interface Settings extends BaseModel {
   readonly model: 'settings';
   theme: string;
@@ -44,16 +53,6 @@ export interface Settings extends BaseModel {
   openWorkspaceNewWindow: boolean | null;
 }
 
-export interface Workspace extends BaseModel {
-  readonly model: 'workspace';
-  name: string;
-  description: string;
-  variables: EnvironmentVariable[];
-  settingValidateCertificates: boolean;
-  settingFollowRedirects: boolean;
-  settingRequestTimeout: number;
-}
-
 export interface CookieJar extends BaseModel {
   readonly model: 'cookie_jar';
   workspaceId: string;
@@ -81,108 +80,6 @@ export function cookieDomain(cookie: Cookie): string {
   return 'unknown';
 }
 
-export interface EnvironmentVariable {
-  name: string;
-  value: string;
-  enabled?: boolean;
-}
-
-export interface Folder extends BaseModel {
-  readonly workspaceId: string;
-  readonly model: 'folder';
-  folderId: string | null;
-  sortPriority: number;
-  name: string;
-}
-
-export interface Environment extends BaseModel {
-  readonly workspaceId: string;
-  readonly model: 'environment';
-  name: string;
-  variables: EnvironmentVariable[];
-}
-
-export interface HttpHeader {
-  name: string;
-  value: string;
-  enabled?: boolean;
-}
-
-export interface HttpUrlParameter {
-  name: string;
-  value: string;
-  enabled?: boolean;
-}
-
-export interface GrpcMetadataEntry {
-  name: string;
-  value: string;
-  enabled?: boolean;
-}
-
-export interface GrpcRequest extends BaseModel {
-  readonly workspaceId: string;
-  readonly model: 'grpc_request';
-  folderId: string | null;
-  sortPriority: number;
-  name: string;
-  url: string;
-  service: string | null;
-  method: string | null;
-  message: string;
-  authentication: Record<string, string | number | boolean | null | undefined>;
-  authenticationType: string | null;
-  metadata: GrpcMetadataEntry[];
-}
-
-export interface GrpcEvent extends BaseModel {
-  readonly workspaceId: string;
-  readonly requestId: string;
-  readonly connectionId: string;
-  readonly model: 'grpc_event';
-  content: string;
-  status: number | null;
-  error: string | null;
-  eventType:
-    | 'info'
-    | 'error'
-    | 'client_message'
-    | 'server_message'
-    | 'connection_start'
-    | 'connection_end';
-  metadata: Record<string, string>;
-}
-
-export interface GrpcConnection extends BaseModel {
-  readonly workspaceId: string;
-  readonly requestId: string;
-  readonly model: 'grpc_connection';
-  service: string;
-  method: string;
-  elapsed: number;
-  elapsedConnection: number;
-  status: number;
-  url: string;
-  error: string | null;
-  trailers: Record<string, string>;
-}
-
-export interface HttpRequest extends BaseModel {
-  readonly workspaceId: string;
-  readonly model: 'http_request';
-  folderId: string | null;
-  sortPriority: number;
-  name: string;
-  url: string;
-  urlParameters: HttpUrlParameter[];
-  body: Record<string, unknown>;
-  bodyType: string | null;
-  authentication: Record<string, string | number | boolean | null | undefined>;
-  authenticationType: string | null;
-  method: string;
-  headers: HttpHeader[];
-}
-
 export interface KeyValue extends Omit<BaseModel, 'id'> {
   readonly model: 'key_value';
   readonly key: string;
@@ -190,23 +87,6 @@ export interface KeyValue extends Omit<BaseModel, 'id'> {
   value: string;
 }
 
-export interface HttpResponse extends BaseModel {
-  readonly workspaceId: string;
-  readonly model: 'http_response';
-  readonly requestId: string;
-  readonly bodyPath: string | null;
-  readonly contentLength: number | null;
-  readonly error: string;
-  readonly status: number;
-  readonly elapsed: number;
-  readonly elapsedHeaders: number;
-  readonly statusReason: string;
-  readonly version: string;
-  readonly remoteAddr: string;
-  readonly url: string;
-  readonly headers: HttpHeader[];
-}
-
 export function isResponseLoading(response: HttpResponse | GrpcConnection): boolean {
   return response.elapsed === 0;
 }
diff --git a/src-web/plugin/runtime.d.ts b/src-web/plugin/runtime.d.ts
deleted file mode 100644
index 13f022b6..00000000
--- a/src-web/plugin/runtime.d.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-declare global {
-  const YAML: {
-    parse: (yml: string) => unknown;
-  };
-  interface YaakContext {
-    foo: string;
-  }
-}
-
-export {};