feat: update readme

ethers-ext/README.md

@@ -10,69 +10,119 @@ Ethers.js Extension for Klaytn offers:
 
 ## Note for ethers v6
 
-`@kaiachain/ethers-ext` was developed based on ethers v5. As a result, ethers v6 classes are incompatible with ethers-ext classes. If you are using ethers v6 in your codebase, do not mix ethers v6 classes and ethers-ext classes. e.g. ethers v6 JsonRpcProvider cannot be supplied to ethers-ext Wallet.
-
-- **Don't**: mix ethers v6 and ethers-ext
-    ```js
-    const ethers = require("ethers");
-    const { Wallet } = require("@kaiachain/ethers-ext");
-
-    const provider = new ethers.JsonRpcProvider("https://public-en-kairos.node.kaia.io");
-    const wallet = new Wallet("<private key>", provider);
-    ```
-- **Do**: mix ethers v5 and ethers-ext
-    ```js
-    const ethers = require("ethers");
-    const { Wallet } = require("@kaiachain/ethers-ext");
-
-    const provider = new ethers.providers.JsonRpcProvider("https://public-en-kairos.node.kaia.io");
-    const wallet = new Wallet("<private key>", provider);
-    ```
-- **Do**: ethers-ext only
-    ```js
-    const { Wallet, JsonRpcProvider } = require("@kaiachain/ethers-ext");
-
-    const provider = new JsonRpcProvider("https://public-en-kairos.node.kaia.io");
-    const wallet = new Wallet("<private key>", provider);
-    ```
+`@kaiachain/ethers-ext` supports both ethers v5 and v6. However, you need to use the right packages which are specified for each `ethers` version. So ethers v5 must be used with packages from `@kaiachain/ethers-ext/v5` and ethers v6 is only compatible with `@kaiachain/ethers-ext/v6`.
+
+> **_NOTE:_**
+> If the import path has no version sub-path (`@kaiachain/ethers-ext`), ethers v5 will be used by default.
+
+- **Don't**: Mixing ethers v6 and ethers-ext for ethers v5
+
+  ```js
+  const ethers = require("ethers"); // ethers v6
+  const { Wallet } = require("@kaiachain/ethers-ext/v5");
+
+  const provider = new ethers.JsonRpcProvider(
+    "https://public-en-kairos.node.kaia.io"
+  );
+  const wallet = new Wallet("<private key>", provider);
+  ```
+
+- **Do**: Using with ethers v5
+
+  ```js
+  const ethers = require("ethers"); // ethers v5
+  const { Wallet } = require("@klaytn/ethers-ext/v5");
+
+  const provider = new ethers.providers.JsonRpcProvider(
+    "https://public-en-kairos.node.kaia.io"
+  );
+  const wallet = new Wallet("<private key>", provider);
+  ```
+
+- **Do**: Using with ethers v6
+
+  ```js
+  const ethers = require("ethers"); // ethers v6
+  const { Wallet } = require("@klaytn/ethers-ext/v6");
+
+  const provider = new ethers.JsonRpcProvider(
+    "https://public-en-kairos.node.kaia.io"
+  );
+  const wallet = new Wallet("<private key>", provider);
+  ```
+
+- **Do**: Using ethers-ext only
+
+  ```js
+  const { Wallet, JsonRpcProvider } = require("@kaiachain/ethers-ext/v5");
+  // or
+  const { Wallet, JsonRpcProvider } = require("@kaiachain/ethers-ext/v6");
+
+  const provider = new JsonRpcProvider("https://public-en-kairos.node.kaia.io");
+  const wallet = new Wallet("<private key>", provider);
+  ```
 
 ## Install
 
 ### Node.js
 
 - Install
-    ```sh
-    npm install --save @kaiachain/ethers-ext ethers@5
-    ```
+  ```sh
+  npm install --save @kaiachain/ethers-ext ethers@5 # or ethers@6
+  ```
 - ESM or TypeScript
-    ```ts
-    import { Wallet, JsonRpcProvider } from "@kaiachain/ethers-ext";
-    const provider = new JsonRpcProvider("https://public-en-kairos.node.kaia.io");
-    const wallet = new Wallet("<private key>", provider);
-    ```
+
+  ```ts
+  import { Wallet, JsonRpcProvider } from "@klaytn/ethers-ext";
+
+  // esm
+  // v5
+  import { v5 } from "@klaytn/ethers-ext";
+  const { Wallet, JsonRpcProvider } = v5;
+  // v6 
+  import { v6 } from "@klaytn/ethers-ext";
+  const { Wallet, JsonRpcProvider } = v6;
+
+  // esm subpath import. If using typescript, add "moduleResolution": "nodenext" to tsconfig.json
+  // v5
+  import { Wallet, JsonRpcProvider } from "@klaytn/ethers-ext/v5";
+  // v6
+  import { Wallet, JsonRpcProvider } from "@klaytn/ethers-ext/v6";
+
+  const provider = new JsonRpcProvider("https://public-en-kairos.node.kaia.io");
+  const wallet = new Wallet("<private key>", provider);
+  ```
+
 - CommonJS
-    ```js
-    const { Wallet, JsonRpcProvider } = require("@kaiachain/ethers-ext");
-    const provider = new JsonRpcProvider("https://public-en-kairos.node.kaia.io");
-    const wallet = new Wallet("<private key>", provider);
-    ```
+
+  ```js
+  // v5
+  const { Wallet, JsonRpcProvider } = require("@klaytn/ethers-ext");
+  const { Wallet, JsonRpcProvider } = require("@klaytn/ethers-ext").v5;
+  const { Wallet, JsonRpcProvider } = require("@klaytn/ethers-ext/v5");
+  // v6
+  const { Wallet, JsonRpcProvider } = require("@klaytn/ethers-ext").v6;
+  const { Wallet, JsonRpcProvider } = require("@klaytn/ethers-ext/v6");
+
+  const provider = new JsonRpcProvider("https://public-en-kairos.node.kaia.io");
+  const wallet = new Wallet("<private key>", provider);
+  ```
 
 ### Browser
 
-It is not recommended to use CDNs in production, But you can use below for quick prototyping.
+It is not recommended to use CDNs in production, But you can use below for quick prototyping. using `ethers-ext.buldle.js` for ethers v5 and `ethers-ext.v6.bundle.js` for ethers v6
 
 ```html
 <script src="https://cdn.jsdelivr.net/npm/@kaiachain/ethers-ext@latest/dist/ethers-ext.bundle.js"></script>
 <script>
-const provider = new ethers_ext.providers.Web3Provider(window.klaytn);
+  const provider = new ethers_ext.providers.Web3Provider(window.klaytn);
 </script>
 ```
 
 ## Usage
 
 See [example](./example) and [test](./test).
 
-
 ## Class extension design
 
 ```mermaid