diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..7733478
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,23 @@
+{
+  "env": {
+    "browser": true,
+    "es2021": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+  ],
+  "overrides": [],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": "latest",
+    "sourceType": "module"
+  },
+  "plugins": ["@typescript-eslint"],
+  "rules": {
+    "@typescript-eslint/no-namespace": "off"
+  },
+  "ignorePatterns": ["./*.json", "node_modules"]
+}
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..e873b8b
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,26 @@
+name: lint
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: ${{ vars.NODE_VERSION }}
+          registry-url: https://registry.npmjs.org
+      - name: cache node_modules
+        id: node_modules_cache_id
+        uses: actions/cache@v2
+        with:
+          path: |
+            node_modules
+          key: node-v${{ vars.NODE_VERSION }}-deps-${{ hashFiles(format('{0}{1}', github.workspace, '/package-lock.json')) }}
+      - run: npm ci
+      - run: npm run lint
diff --git a/.github/workflows/npm-publish.yml b/.github/workflows/npm-publish.yml
new file mode 100644
index 0000000..4b816cc
--- /dev/null
+++ b/.github/workflows/npm-publish.yml
@@ -0,0 +1,27 @@
+name: npm publish
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  npm-publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: ${{ vars.NODE_VERSION }}
+          registry-url: https://registry.npmjs.org
+      - name: cache node_modules
+        id: node_modules_cache_id
+        uses: actions/cache@v2
+        with:
+          path: |
+            node_modules
+          key: node-v${{ vars.NODE_VERSION }}-deps-${{ hashFiles(format('{0}{1}', github.workspace, '/package-lock.json')) }}
+      - run: npm ci
+      - run: npm run lint
+      - run: npx -y can-npm-publish && npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NODE_AUTH_TOKEN}}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bf3095d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,23 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+types
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..129c097
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 penpenpng
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e12f1f1
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+# nostr-typedef
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..4ca1845
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,220 @@
+export interface Event<K = number> {
+  id: string;
+  sig: string;
+  kind: K;
+  tags: string[][];
+  pubkey: string;
+  content: string;
+  created_at: number;
+}
+
+export interface UnsignedEvent<K = number> {
+  kind: K;
+  tags: string[][];
+  pubkey: string;
+  content: string;
+  created_at: number;
+}
+
+export interface EventParameters<K = number> {
+  id?: string;
+  sig?: string;
+  kind: K;
+  tags?: string[][];
+  pubkey?: string;
+  content: string;
+  created_at?: number;
+}
+
+export enum Kind {
+  Metadata = 0,
+  Text = 1,
+  RecommendRelay = 2,
+  Contacts = 3,
+  EncryptedDirectMessage = 4,
+  EventDeletion = 5,
+  Repost = 6,
+  Reaction = 7,
+  BadgeAward = 8,
+  GenericRepost = 16,
+  ChannelCreation = 40,
+  ChannelMetadata = 41,
+  ChannelMessage = 42,
+  ChannelHideMessage = 43,
+  ChannelMuteUser = 44,
+  Blank = 255,
+  FileMetadata = 1063,
+  Reporting = 1984,
+  Label = 1985,
+  ZapRequest = 9734,
+  Zap = 9735,
+  MuteList = 10000,
+  PinList = 10001,
+  RelayListMetadata = 10002,
+  WalletInfo = 13194,
+  ClientAuthentication = 22242,
+  WalletRequest = 23194,
+  WalletResponse = 23195,
+  NostrConnect = 24133,
+  HttpAuth = 27235,
+  CategorizedPeopleList = 30000,
+  GategorizedBookmarkList = 30001,
+  ProfileBadges = 30008,
+  BadgeDefinition = 30009,
+  CreateOrUpdateStall = 30017,
+  CreateOrUpdateProduct = 30018,
+  LongFormContent = 30023,
+  ApplicationSpecificData = 30078,
+  HandlerRecommendation = 31989,
+  HandlerInformation = 31990,
+}
+
+type Chars<S extends string> = S extends `${infer Head}${infer Tail}`
+  ? Uppercase<Head> | Lowercase<Head> | Chars<Tail>
+  : never;
+// cf. NIP-12
+export type TagName = `#${Chars<"abcdefghijklmnopqrstuvwxyz">}`;
+
+export type Filter = {
+  ids?: string[];
+  kinds?: number[];
+  authors?: string[];
+  since?: number;
+  until?: number;
+  limit?: number;
+} & {
+  [key in TagName]?: string[];
+};
+
+interface CountResponse {
+  count: number;
+}
+
+export namespace ToRelayMessage {
+  export type Any = AUTH | CLOSE | COUNT | EVENT | REQ;
+  export type AUTH = [type: "AUTH", event: Event<Kind.ClientAuthentication>];
+  export type CLOSE = [type: "CLOSE", subId: string];
+  export type COUNT = [type: "COUNT", subId: string, ...filters: Filter[]];
+  export type EVENT = [type: "EVENT", event: Event];
+  export type REQ = [type: "REQ", subId: string, ...filters: Filter[]];
+}
+
+export namespace ToClientMessage {
+  export type Any = AUTH | COUNT | EOSE | EVENT | NOTICE | OK;
+  export type Sub = EVENT | EOSE;
+  export type AUTH = [type: "AUTH", challengeMessage: string];
+  export type COUNT = [type: "COUNT", subId: string, count: CountResponse];
+  export type EOSE = [type: "EOSE", subId: string];
+  export type EVENT = [type: "EVENT", subId: string, event: Event];
+  export type NOTICE = [type: "NOTICE", message: string];
+  export type OK = [
+    type: "OK",
+    eventId: string,
+    succeeded: boolean,
+    message?: string
+  ];
+}
+
+export namespace Nip07 {
+  export interface Nostr {
+    getPublicKey: () => Promise<string>;
+    signEvent: (event: {
+      kind: number;
+      tags: string[][];
+      content: string;
+      created_at: number;
+    }) => Promise<{
+      id: string;
+      sig: string;
+      kind: number;
+      tags: string[][];
+      pubkey: string;
+      content: string;
+      created_at: number;
+    }>;
+    getRelays?: () => Promise<GetRelayResult>;
+    nip04?: Nip04Crypto;
+  }
+
+  export interface GetRelayResult {
+    [url: string]: { read: boolean; write: boolean };
+  }
+
+  export interface Nip04Crypto {
+    encrypt: (pubkey: string, plaintext: string) => string;
+    decrypt: (pubkey: string, ciphertext: string) => string;
+  }
+}
+
+export namespace Nip11 {
+  export interface RelayInfo {
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#name */
+    name?: string;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#description */
+    description?: string;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#pubkey */
+    pubkey?: string;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#contact */
+    contact?: string;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#supported-nips */
+    supported_nips?: number[];
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#software */
+    software?: string;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#version */
+    version?: string;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#server-limitations */
+    limitation?: ServerLimitations;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#event-retention */
+    retention?: EventRetention[];
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#content-limitations */
+    relay_countries?: string[];
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#community-preferences */
+    language_tags?: string[];
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#community-preferences */
+    tags?: string[];
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#community-preferences */
+    posting_policy?: string;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#pay-to-relay */
+    payments_url?: string;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#pay-to-relay */
+    fees?: RelayFees;
+    /** https://github.com/nostr-protocol/nips/blob/master/11.md#icon */
+    icon?: string;
+    [key: string]: unknown;
+  }
+
+  export interface ServerLimitations {
+    max_message_length?: number;
+    max_subscriptions?: number;
+    max_filters?: number;
+    max_limit?: number;
+    max_subid_length?: number;
+    min_prefix?: number;
+    max_event_tags?: number;
+    max_content_length?: number;
+    min_pow_difficulty?: number;
+    auth_required?: boolean;
+    payment_required?: boolean;
+  }
+
+  export interface EventRetention {
+    kinds?: (number | [start: number, end: number])[];
+    time?: number | null;
+    count?: number;
+  }
+
+  export interface RelayFees {
+    admission?: RelayFeeAmount[];
+    subscription?: RelayFeeAmount[];
+    publication?: RelayFeeAmount[];
+  }
+
+  export interface RelayFeeAmount {
+    amount?: number;
+    unit?: string;
+    period?: number;
+    kinds?: number[];
+  }
+}
+
+export {};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..50327c6
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1497 @@
+{
+  "name": "nostr-typedef",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "nostr-typedef",
+      "version": "0.1.0",
+      "license": "MIT",
+      "devDependencies": {
+        "@typescript-eslint/eslint-plugin": "^5.56.0",
+        "@typescript-eslint/parser": "^5.56.0",
+        "eslint": "^8.36.0",
+        "eslint-config-prettier": "^8.8.0",
+        "prettier": "^2.8.7",
+        "typescript": "^5.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.4.0",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.3.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.5.1",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@eslint/eslintrc": {
+      "version": "2.0.3",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ajv": "^6.12.4",
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+        "globals": "^13.19.0",
+        "ignore": "^5.2.0",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^4.1.0",
+        "minimatch": "^3.1.2",
+        "strip-json-comments": "^3.1.1"
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+      },
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+      }
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+    "node_modules/@eslint/js": {
+      "version": "8.43.0",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@humanwhocodes/config-array": {
+      "version": "0.11.10",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@humanwhocodes/object-schema": "^1.2.1",
+        "debug": "^4.1.1",
+        "minimatch": "^3.0.5"
+      },
+      "engines": {
+        "node": ">=10.10.0"
+      }
+    },
+    "node_modules/@humanwhocodes/module-importer": {
+      "version": "1.0.1",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
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+      "version": "1.2.1",
+      "dev": true,
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@nodelib/fs.scandir": {
+      "version": "2.1.5",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@nodelib/fs.stat": "2.0.5",
+        "run-parallel": "^1.1.9"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/@nodelib/fs.stat": {
+      "version": "2.0.5",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/@nodelib/fs.walk": {
+      "version": "1.2.8",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@nodelib/fs.scandir": "2.1.5",
+        "fastq": "^1.6.0"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/@types/json-schema": {
+      "version": "7.0.12",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/semver": {
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+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..75a10b4
--- /dev/null
+++ b/package.json
@@ -0,0 +1,35 @@
+{
+  "name": "nostr-typedef",
+  "version": "0.1.0",
+  "description": "Type definitions for Nostr applications",
+  "author": "penpenpng",
+  "keywords": [
+    "nostr"
+  ],
+  "homepage": "https://github.com/penpenpng/nostr-typedef/",
+  "bugs": {
+    "url": "https://github.com/penpenpng/nostr-typedef/issues"
+  },
+  "license": "MIT",
+  "types": "./index.d.ts",
+  "files": [
+    "index.d.ts"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/penpenpng/nostr-typedef.git"
+  },
+  "scripts": {
+    "build": "tsc",
+    "lint": "eslint index.d.ts && prettier --check index.d.ts",
+    "lint:fix": "eslint --fix index.d.ts && prettier --write index.d.ts"
+  },
+  "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^5.56.0",
+    "@typescript-eslint/parser": "^5.56.0",
+    "eslint": "^8.36.0",
+    "eslint-config-prettier": "^8.8.0",
+    "prettier": "^2.8.7",
+    "typescript": "^5.0.0"
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..a9d2c41
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "lib": ["ESNext", "DOM"],
+    "strict": true
+  },
+  "include": ["index.d.ts"]
+}