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Author: Fedor Katurov <gotham48@gmail.com>
Date: Sun Jan 1 15:50:55 2023 +0600
vault backup: 2023-01-01 15:50:55
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class="_row_192pu_24"><a href="/frontend/react/axios-with-abortcontroller" class="_link_192pu_66">Axios With AbortController</a></div><!--]--></div></div><div class="_container_192pu_1 _secondary_192pu_4"><div class="_heading_192pu_48">Vue</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/frontend/vue/adding-global-properties-to-component" class="_link_192pu_66">Adding Global Properties To Component</a></div><div class="_row_192pu_24"><a href="/frontend/vue/make-nuxt-handle-obsidian-highlights" class="_link_192pu_66">Make Nuxt Handle Obsidian Highlights</a></div><!--]--></div></div><div class="_container_192pu_1 _secondary_192pu_4"><div class="_heading_192pu_48">Webgl</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/frontend/webgl/basics-of-webgl-(drawing-a-cube)" class="_link_192pu_66">Basics Of WebGL (Drawing A Cube)</a></div><div class="_row_192pu_24"><a href="/frontend/webgl/fragment-shaders" class="_link_192pu_66">Fragment Shaders</a></div><div class="_row_192pu_24"><a href="/frontend/webgl/rendering-without-blocking-in-a-worker" class="_link_192pu_66">Rendering Without Blocking In A Worker</a></div><div class="_row_192pu_24"><a href="/frontend/webgl/vertex-shaders" class="_link_192pu_66">Vertex Shaders</a></div><!--]--></div></div><!--]--></div></div></div><div class="_row_kmqkz_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Git</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/git/force-git-to-use-https" class="_link_192pu_66">Force Git To Use HTTPS</a></div><div class="_row_192pu_24"><a href="/git/git-aliases-and-useful-commands" class="_link_192pu_66">Git Aliases And Useful Commands</a></div><!--]--></div></div></div><div class="_row_kmqkz_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Graphql</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a 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Setup</a></div><!--]--></div></div></div><div class="_row_kmqkz_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Typescript</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/typescript/add-global-variable-to-window" class="_link_192pu_66">Add Global Variable To Window</a></div><div class="_row_192pu_24"><a href="/typescript/flatten-object-with-periods" class="_link_192pu_66">Flatten Object With Periods</a></div><div class="_row_192pu_24"><a href="/typescript/type-guards" class="_link_192pu_66">Type Guards</a></div><!--]--></div></div></div><!--]--></nav></div></div><div class="_main_16c5m_17"><div class="_content_16c5m_93"><div class="_wrapper_vom09_1" hastransition="true"><div class="_content_vom09_14"><button class="_theme_toggle_vom09_24 _button_jz7in_1 _theme_toggle_vom09_24"><span></span></button><!--[--><!--[--><main class="_content_1gz79_1"><!--[--><h1>Common Typescript Examples</h1><article><div><ul><!--[--><li><!--[-->Simple #dapp example for tests: <a href="https://metamask.github.io/test-dapp/" rel="nofollow" target="_blank"><!--[-->https://metamask.github.io/test-dapp/<!--]--></a><!--]--></li><li><!--[-->Interaction with smart contracts described in <a href="/blockchain/smart-contracts" class=""><!--[-->Smart contracts<!--]--></a><!--]--></li><!--]--></ul><h2 id="connecting-to-node"><a href="#connecting-to-node"><!--[-->Connecting to node<!--]--></a></h2><p><!--[-->If #Metamask extension installed, <code><!--[-->Web3.givenProvider<!--]--></code> is available in global window. You can use <a href="https://infura.io" rel="nofollow" target="_blank"><!--[-->Infura<!--]--></a> or your node instead:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-ecbe36">import</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">Web3</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">from</span><span class="ct-9f060e"> </span><span class="ct-32dbb6">'web3'</span><span class="ct-9f060e">;</span></span><span class="line"></span><span class="line"><span class="ct-8d5ac8">// URL of your node</span></span><span class="line"><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">PROVIDER_URL</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-32dbb6">'https://...'</span><span class="ct-9f060e">;</span></span><span class="line"></span><span class="line"><span class="ct-ecbe36">export</span><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">web3</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">new</span><span class="ct-9f060e"> </span><span class="ct-4ebdb6">Web3</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">Web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">givenProvider</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">||</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">PROVIDER_URL</span><span class="ct-9f060e">);</span></span></code></pre><!--]--></div><h2 id="getting-wallet-balance"><a href="#getting-wallet-balance"><!--[-->Getting wallet balance<!--]--></a></h2><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-1e78b0">const</span><span class="ct-3f2b20"> </span><span class="ct-551cde">getBalance</span><span class="ct-3f2b20"> </span><span class="ct-284e4e">=</span><span class="ct-3f2b20"> </span><span class="ct-1e78b0">async</span><span class="ct-3f2b20"> (</span><span class="ct-eebc4f">address</span><span class="ct-284e4e">:</span><span class="ct-3f2b20"> </span><span class="ct-58b177">string</span><span class="ct-3f2b20">) </span><span class="ct-1e78b0">=></span><span class="ct-3f2b20"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">return</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">await</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">eth</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">getBalance</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">address</span><span class="ct-9f060e">);</span></span><span class="line"><span class="ct-9f060e">}</span></span></code></pre><!--]--></div><h2 id="getting-wallet-address"><a href="#getting-wallet-address"><!--[-->Getting wallet address<!--]--></a></h2><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-8d5ac8">// first we need to authorize</span></span><span class="line"><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-4ebdb6">authorize</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-688799">async</span><span class="ct-9f060e"> () </span><span class="ct-688799">=></span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">await</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">currentProvider</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">request</span><span class="ct-9f060e">({ method: </span><span class="ct-32dbb6">'eth_requestAccounts'</span><span class="ct-9f060e"> });</span></span><span class="line"><span class="ct-9f060e">}</span></span><span class="line"></span><span class="line"><span class="ct-8d5ac8">// then we can get wallet address</span></span><span class="line"><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-4ebdb6">getCurrentAddressUser</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> () </span><span class="ct-688799">=></span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">return</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">currentProvider</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">selectedAddress</span><span class="ct-9f060e">;</span></span><span class="line"><span class="ct-9f060e">}</span></span></code></pre><!--]--></div><h2 id="sending-transaction"><a href="#sending-transaction"><!--[-->Sending transaction<!--]--></a></h2><p><!--[-->Sending <code><!--[-->value<!--]--></code> tokens with <code><!--[-->memo<!--]--></code> as value:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"></span><span class="line"><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-4ebdb6">transfer</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-688799">async</span><span class="ct-9f060e"> ({ </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">from</span><span class="ct-9f060e">, </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">to</span><span class="ct-9f060e">, </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">value</span><span class="ct-9f060e">, </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">memo</span><span class="ct-9f060e">, </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">privateKey</span><span class="ct-9f060e">, </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">gasLimit</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span></span><span class="line"><span class="ct-9f060e">}) </span><span class="ct-688799">=></span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">nonce</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">await</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">eth</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">getTransactionCount</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">from</span><span class="ct-9f060e">);</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">gasPrice</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">await</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">eth</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">getGasPrice</span><span class="ct-9f060e">();</span></span><span class="line"><span class="ct-9f060e"> </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">rawTx</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">from</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">to</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> value: </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toHex</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">Web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toWei</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">value</span><span class="ct-9f060e">, </span><span class="ct-32dbb6">'ether'</span><span class="ct-9f060e">)),</span></span><span class="line"><span class="ct-9f060e"> gasLimit: </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toHex</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">gasLimit</span><span class="ct-9f060e">),</span></span><span class="line"><span class="ct-9f060e"> gasPrice: </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toHex</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">gasPrice</span><span class="ct-9f060e">),</span></span><span class="line"><span class="ct-9f060e"> nonce: </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toHex</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">nonce</span><span class="ct-9f060e">),</span></span><span class="line"><span class="ct-9f060e"> data: </span><span class="ct-9da9a5">memo</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> };</span></span><span class="line"><span class="ct-9f060e"> </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">privateKeyBuffer</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">EthUtil</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toBuffer</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">privateKey</span><span class="ct-9f060e">);</span></span><span class="line"><span class="ct-9f060e"> </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">tx</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">new</span><span class="ct-9f060e"> </span><span class="ct-4ebdb6">Transaction</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">rawTx</span><span class="ct-9f060e">);</span></span><span class="line"><span class="ct-9f060e"> </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">tx</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">sign</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">privateKeyBuffer</span><span class="ct-9f060e">);</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">serializedTx</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">tx</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">serialize</span><span class="ct-9f060e">();</span></span><span class="line"><span class="ct-9f060e"> </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">return</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">this</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">eth</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">sendSignedTransaction</span><span class="ct-9f060e">(</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-32dbb6">`0x${</span><span class="ct-9da9a5">serializedTx</span><span class="ct-22013b">.</span><span class="ct-4ebdb6">toString</span><span class="ct-22013b">(</span><span class="ct-32dbb6">'hex'</span><span class="ct-22013b">)</span><span class="ct-32dbb6">}`</span></span><span class="line"><span class="ct-9f060e"> );</span></span><span class="line"><span class="ct-9f060e">}</span></span></code></pre><!--]--></div><h2 id="estimating-transaction-fee"><a href="#estimating-transaction-fee"><!--[-->Estimating transaction FEE<!--]--></a></h2><p><!--[-->Useful to get fixed amount of tokens from user with pre-estimated fee.<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-ecbe36">import</span><span class="ct-9f060e"> { </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e"> } </span><span class="ct-ecbe36">from</span><span class="ct-9f060e"> </span><span class="ct-32dbb6">'.'</span><span class="ct-9f060e">;</span></span><span class="line"></span><span class="line"><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-4ebdb6">estimateFee</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-688799">async</span><span class="ct-9f060e"> ({</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">from</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">to</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">value</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">memo</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e">}) </span><span class="ct-688799">=></span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">gasPrice</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">await</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">eth</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">getGasPrice</span><span class="ct-9f060e">();</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-3ff5a3">gasLimit</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">await</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">eth</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">estimateGas</span><span class="ct-9f060e">({</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">from</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">to</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> value: </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toHex</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toWei</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">value</span><span class="ct-9f060e">, </span><span class="ct-32dbb6">'ether'</span><span class="ct-9f060e">)),</span></span><span class="line"><span class="ct-9f060e"> data: </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">asciiToHex</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">memo</span><span class="ct-9f060e">),</span></span><span class="line"><span class="ct-9f060e"> }).</span><span class="ct-4ebdb6">call</span><span class="ct-9f060e">();</span></span><span class="line"><span class="ct-9f060e"> </span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">return</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">utils</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">fromWei</span><span class="ct-9f060e">(</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-11980a">BigInt</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">gasPrice</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toString</span><span class="ct-9f060e">())</span></span><span class="line"><span class="ct-9f060e"> .</span><span class="ct-4ebdb6">multiply</span><span class="ct-9f060e">(</span><span class="ct-11980a">BigInt</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">gasLimit</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">toString</span><span class="ct-9f060e">()))</span></span><span class="line"><span class="ct-9f060e"> .</span><span class="ct-4ebdb6">toString</span><span class="ct-9f060e">()</span></span><span class="line"><span class="ct-9f060e"> );</span></span><span class="line"><span class="ct-9f060e">}</span></span></code></pre><!--]--></div><h2 id="subscribing-to-wallet-address-change"><a href="#subscribing-to-wallet-address-change"><!--[-->Subscribing to wallet address change<!--]--></a></h2><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-ecbe36">import</span><span class="ct-9f060e"> { </span><span class="ct-9da9a5">web3</span><span class="ct-9f060e"> } </span><span class="ct-ecbe36">from</span><span class="ct-9f060e"> </span><span class="ct-32dbb6">'.'</span><span class="ct-9f060e">;</span></span><span class="line"></span><span class="line"><span class="ct-9da9a5">web3</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">currentProvider</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">on</span><span class="ct-9f060e">(</span><span class="ct-32dbb6">'accountsChanged'</span><span class="ct-9f060e">, </span><span class="ct-9da9a5">callback</span><span class="ct-9f060e">);</span></span></code></pre><!--]--></div><h2 id="watching-network-change"><a href="#watching-network-change"><!--[-->Watching network change<!--]--></a></h2><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-9da9a5">ethereum</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">on</span><span class="ct-9f060e">(</span><span class="ct-32dbb6">'chainChanged'</span><span class="ct-9f060e">, </span><span class="ct-9da9a5">handler</span><span class="ct-8a3ec7">:</span><span class="ct-9f060e"> </span></span></code></pre><!--]--></div><h2 id="adding-custom-token-to-wallet"><a href="#adding-custom-token-to-wallet"><!--[-->Adding custom token to wallet<!--]--></a></h2><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-9da9a5">window</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">ethereum</span></span><span class="line"><span class="ct-9f060e"> .</span><span class="ct-4ebdb6">request</span><span class="ct-9f060e">({</span></span><span class="line"><span class="ct-9f060e"> method: </span><span class="ct-32dbb6">'wallet_watchAsset'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> params: {</span></span><span class="line"><span class="ct-9f060e"> type: </span><span class="ct-32dbb6">'ERC20'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> options: {</span></span><span class="line"><span class="ct-9f060e"> address: </span><span class="ct-32dbb6">'0xb60e8dd61c5d32be8058bb8eb970870f07233155'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> symbol: </span><span class="ct-32dbb6">'FOO'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> decimals: </span><span class="ct-372dd9">18</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> image: </span><span class="ct-32dbb6">'https://foo.io/token-image.svg'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> },</span></span><span class="line"><span class="ct-9f060e"> },</span></span><span class="line"><span class="ct-9f060e"> })</span></span><span class="line"><span class="ct-3f2b20"> .</span><span class="ct-551cde">then</span><span class="ct-3f2b20">((</span><span class="ct-eebc4f">success</span><span class="ct-3f2b20">) </span><span class="ct-1e78b0">=></span><span class="ct-3f2b20"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">if</span><span class="ct-9f060e"> (</span><span class="ct-9da9a5">success</span><span class="ct-9f060e">) {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-9da9a5">console</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">log</span><span class="ct-9f060e">(</span><span class="ct-32dbb6">'FOO successfully added to wallet!'</span><span class="ct-9f060e">)</span></span><span class="line"><span class="ct-9f060e"> } </span><span class="ct-ecbe36">else</span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">throw</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">new</span><span class="ct-9f060e"> </span><span class="ct-11980a">Error</span><span class="ct-9f060e">(</span><span class="ct-32dbb6">'Something went wrong.'</span><span class="ct-9f060e">)</span></span><span class="line"><span class="ct-9f060e"> }</span></span><span class="line"><span class="ct-9f060e"> })</span></span><span class="line"><span class="ct-9f060e"> .</span><span class="ct-4ebdb6">catch</span><span class="ct-9f060e">(</span><span class="ct-9da9a5">console</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">error</span><span class="ct-9f060e">)</span></span></code></pre><!--]--></div><h2 id="changing-network-to-custom"><a href="#changing-network-to-custom"><!--[-->Changing network to custom<!--]--></a></h2><p><!--[-->Checking current chainId:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-688799">const</span><span class="ct-9f060e"> </span><span class="ct-4ebdb6">getChainID</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">=</span><span class="ct-9f060e"> </span><span class="ct-688799">async</span><span class="ct-9f060e"> () </span><span class="ct-688799">=></span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">return</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">ethereum</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">request</span><span class="ct-9f060e">({ method: </span><span class="ct-32dbb6">'eth_chainId'</span><span class="ct-9f060e"> })</span></span><span class="line"><span class="ct-9f060e">}</span></span></code></pre><!--]--></div><p><!--[-->Asking wallet to change current network:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-ecbe36">try</span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">await</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">window</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">ethereum</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">request</span><span class="ct-9f060e">({</span></span><span class="line"><span class="ct-9f060e"> method: </span><span class="ct-32dbb6">'wallet_switchEthereumChain'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> params: [{ chainId: </span><span class="ct-32dbb6">'0x03'</span><span class="ct-9f060e"> }], </span><span class="ct-8d5ac8">// ropsten chainID (3) in hex</span></span><span class="line"><span class="ct-9f060e"> });</span></span><span class="line"><span class="ct-9f060e">} </span><span class="ct-ecbe36">catch</span><span class="ct-9f060e"> (</span><span class="ct-9da9a5">switchError</span><span class="ct-9f060e">) {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-8d5ac8">// This error code indicates that the chain has not been added to MetaMask.</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">if</span><span class="ct-9f060e"> (</span><span class="ct-9da9a5">error</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">code</span><span class="ct-9f060e"> </span><span class="ct-ecbe36">===</span><span class="ct-9f060e"> </span><span class="ct-372dd9">4902</span><span class="ct-9f060e">) {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">try</span><span class="ct-9f060e"> {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-ecbe36">await</span><span class="ct-9f060e"> </span><span class="ct-9da9a5">window</span><span class="ct-9f060e">.</span><span class="ct-9da9a5">ethereum</span><span class="ct-9f060e">.</span><span class="ct-4ebdb6">request</span><span class="ct-9f060e">({</span></span><span class="line"><span class="ct-9f060e"> method: </span><span class="ct-32dbb6">'wallet_addEthereumChain'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> params: [{ </span></span><span class="line"><span class="ct-9f060e"> chainId: </span><span class="ct-32dbb6">'0x03'</span><span class="ct-9f060e">, </span><span class="ct-8d5ac8">// ropsten chainID (3) in hex</span></span><span class="line"><span class="ct-9f060e"> chainName: </span><span class="ct-32dbb6">'Ropsten Test Network'</span><span class="ct-9f060e">, </span></span><span class="line"><span class="ct-9f060e"> nativeCurrency: { </span></span><span class="line"><span class="ct-9f060e"> name: </span><span class="ct-32dbb6">'ETH'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> symbol: </span><span class="ct-32dbb6">'ETH'</span><span class="ct-9f060e">,</span></span><span class="line"><span class="ct-9f060e"> decimals: </span><span class="ct-372dd9">18</span></span><span class="line"><span class="ct-9f060e"> }, </span></span><span class="line"><span class="ct-9f060e"> rpcUrls: [</span><span class="ct-32dbb6">'https://ropsten.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161'</span><span class="ct-9f060e">], </span></span><span class="line"><span class="ct-9f060e"> blockExplorerUrls: [</span><span class="ct-32dbb6">'https://ropsten.etherscan.io'</span><span class="ct-9f060e">] </span></span><span class="line"><span class="ct-9f060e"> }] ,</span></span><span class="line"><span class="ct-9f060e"> });</span></span><span class="line"><span class="ct-9f060e"> } </span><span class="ct-ecbe36">catch</span><span class="ct-9f060e"> (</span><span class="ct-9da9a5">addError</span><span class="ct-9f060e">) {</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-8d5ac8">// handle "add" error</span></span><span class="line"><span class="ct-9f060e"> }</span></span><span class="line"><span class="ct-9f060e"> }</span></span><span class="line"><span class="ct-9f060e"> </span><span class="ct-8d5ac8">// handle other "switch" errors</span></span><span class="line"><span class="ct-9f060e">}</span></span></code></pre><!--]--></div><style>.ct-372dd9{color:#79C0FF}.ct-8a3ec7{color:#C9D1D9}.ct-11980a{color:#79C0FF}.ct-22013b{color:#A5D6FF}.ct-58b177{color:#79C0FF}.ct-eebc4f{color:#FFA657}.ct-284e4e{color:#FF7B72}.ct-551cde{color:#D2A8FF}.ct-3f2b20{color:#C9D1D9}.ct-1e78b0{color:#FF7B72}.ct-4ebdb6{color:#D2A8FF}.ct-3ff5a3{color:#79C0FF}.ct-688799{color:#FF7B72}.ct-8d5ac8{color:#8B949E}.ct-32dbb6{color:#A5D6FF}.ct-9da9a5{color:#C9D1D9}.ct-9f060e{color:#C9D1D9}.ct-ecbe36{color:#FF7B72}.light .ct-ecbe36{color:#859900}.light .ct-9f060e{color:#657B83}.light .ct-9da9a5{color:#268BD2}.light .ct-32dbb6{color:#2AA198}.light .ct-8d5ac8{color:#93A1A1}.light .ct-688799{color:#073642}.light .ct-3ff5a3{color:#268BD2}.light .ct-4ebdb6{color:#268BD2}.light .ct-1e78b0{color:#073642}.light .ct-3f2b20{color:#657B83}.light .ct-551cde{color:#268BD2}.light .ct-284e4e{color:#859900}.light .ct-eebc4f{color:#657B83}.light .ct-58b177{color:#859900}.light .ct-22013b{color:#657B83}.light .ct-11980a{color:#859900}.light .ct-8a3ec7{color:#859900}.light .ct-372dd9{color:#D33682}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_vom09_18 _footer_vom09_18"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 2023) <a href="https://github.com/muerwre/" rel="noopener noreferrer" target="_blank">muerwre</a></div></footer></div></div></div></div></div><script type="module">import p from "/blockchain/common-typescript-examples/_payload.js";window.__NUXT__={...p,...((function(a,b,c,d,e,f){return 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