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Author: Fedor Katurov <gotham48@gmail.com>
Date: Thu Nov 3 20:46:37 2022 +0600
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class="_link_192pu_66">Git Aliases And Useful Commands</a></div><!--]--></div></div></div><div class="_row_fvpir_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Graphql</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/graphql/apollo-client-pagination" class="_link_192pu_66">Apollo Client Pagination</a></div><div class="_row_192pu_24"><a href="/graphql/refresh-token-in-apollo-client" class="_link_192pu_66">Refresh Token In Apollo Client</a></div><!--]--></div></div></div><div class="_row_fvpir_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Linux</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/linux/gitea-for-git-hosting" class="_link_192pu_66">Gitea For Git Hosting</a></div><div class="_row_192pu_24"><a href="/linux/google-photos-alternative-with-photoprism" class="_link_192pu_66">Google Photos Alternative With Photoprism</a></div><div class="_row_192pu_24"><a href="/linux/resume-or-start-screen-session" class="_link_192pu_66">Resume Or Start Screen Session</a></div><div class="_row_192pu_24"><a href="/linux/rsync-file-with-ssh" class="_link_192pu_66">Rsync File With SSH</a></div><div class="_row_192pu_24"><a href="/linux/setting-up-nginx" class="_link_192pu_66">Setting Up NGINX</a></div><div class="_row_192pu_24"><a href="/linux/ssh" class="_link_192pu_66">SSH</a></div><!--]--></div></div></div><div class="_row_fvpir_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Sql</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/sql/mysql-and-mariadb-setup" class="_link_192pu_66">MySQL And MariaDB Setup</a></div><div class="_row_192pu_24"><a href="/sql/postgress-setup" class="_link_192pu_66">Postgress Setup</a></div><!--]--></div></div></div><div class="_row_fvpir_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_bdvnl_17"><div class="_wrapper_1hfaq_1" hastransition="true"><div class="_content_1hfaq_7"><button class="_theme_toggle_1hfaq_28 _button_jz7in_1 _theme_toggle_1hfaq_28"><span></span></button><!--[--><!--[--><main><!--[--><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-de90bb">import</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">Web3</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">from</span><span class="ct-fb5c31"> </span><span class="ct-5f2cb5">'web3'</span><span class="ct-fb5c31">;</span></span><span class="line"></span><span class="line"><span class="ct-a55713">// URL of your node</span></span><span class="line"><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">PROVIDER_URL</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-5f2cb5">'https://...'</span><span class="ct-fb5c31">;</span></span><span class="line"></span><span class="line"><span class="ct-de90bb">export</span><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">web3</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">new</span><span class="ct-fb5c31"> </span><span class="ct-79c17f">Web3</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">Web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">givenProvider</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">||</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">PROVIDER_URL</span><span class="ct-fb5c31">);</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-7adbe1">const</span><span class="ct-639184"> </span><span class="ct-14ea1e">getBalance</span><span class="ct-639184"> </span><span class="ct-5e9d96">=</span><span class="ct-639184"> </span><span class="ct-7adbe1">async</span><span class="ct-639184"> (</span><span class="ct-36ec46">address</span><span class="ct-5e9d96">:</span><span class="ct-639184"> </span><span class="ct-e83a17">string</span><span class="ct-639184">) </span><span class="ct-7adbe1">=></span><span class="ct-639184"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">return</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">await</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">eth</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">getBalance</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">address</span><span class="ct-fb5c31">);</span></span><span class="line"><span class="ct-fb5c31">}</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-a55713">// first we need to authorize</span></span><span class="line"><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-79c17f">authorize</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-51f6e3">async</span><span class="ct-fb5c31"> () </span><span class="ct-51f6e3">=></span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">await</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">currentProvider</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">request</span><span class="ct-fb5c31">({ method: </span><span class="ct-5f2cb5">'eth_requestAccounts'</span><span class="ct-fb5c31"> });</span></span><span class="line"><span class="ct-fb5c31">}</span></span><span class="line"></span><span class="line"><span class="ct-a55713">// then we can get wallet address</span></span><span class="line"><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-79c17f">getCurrentAddressUser</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> () </span><span class="ct-51f6e3">=></span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">return</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">currentProvider</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">selectedAddress</span><span class="ct-fb5c31">;</span></span><span class="line"><span class="ct-fb5c31">}</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-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-79c17f">transfer</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-51f6e3">async</span><span class="ct-fb5c31"> ({ </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">from</span><span class="ct-fb5c31">, </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">to</span><span class="ct-fb5c31">, </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">value</span><span class="ct-fb5c31">, </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">memo</span><span class="ct-fb5c31">, </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">privateKey</span><span class="ct-fb5c31">, </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">gasLimit</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span></span><span class="line"><span class="ct-fb5c31">}) </span><span class="ct-51f6e3">=></span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">nonce</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">await</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">eth</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">getTransactionCount</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">from</span><span class="ct-fb5c31">);</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">gasPrice</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">await</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">eth</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">getGasPrice</span><span class="ct-fb5c31">();</span></span><span class="line"><span class="ct-fb5c31"> </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">rawTx</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">from</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">to</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> value: </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toHex</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">Web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toWei</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">value</span><span class="ct-fb5c31">, </span><span class="ct-5f2cb5">'ether'</span><span class="ct-fb5c31">)),</span></span><span class="line"><span class="ct-fb5c31"> gasLimit: </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toHex</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">gasLimit</span><span class="ct-fb5c31">),</span></span><span class="line"><span class="ct-fb5c31"> gasPrice: </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toHex</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">gasPrice</span><span class="ct-fb5c31">),</span></span><span class="line"><span class="ct-fb5c31"> nonce: </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toHex</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">nonce</span><span class="ct-fb5c31">),</span></span><span class="line"><span class="ct-fb5c31"> data: </span><span class="ct-1d037e">memo</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> };</span></span><span class="line"><span class="ct-fb5c31"> </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">privateKeyBuffer</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">EthUtil</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toBuffer</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">privateKey</span><span class="ct-fb5c31">);</span></span><span class="line"><span class="ct-fb5c31"> </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">tx</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">new</span><span class="ct-fb5c31"> </span><span class="ct-79c17f">Transaction</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">rawTx</span><span class="ct-fb5c31">);</span></span><span class="line"><span class="ct-fb5c31"> </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">tx</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">sign</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">privateKeyBuffer</span><span class="ct-fb5c31">);</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">serializedTx</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">tx</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">serialize</span><span class="ct-fb5c31">();</span></span><span class="line"><span class="ct-fb5c31"> </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">return</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">this</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">eth</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">sendSignedTransaction</span><span class="ct-fb5c31">(</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-5f2cb5">`0x${</span><span class="ct-1d037e">serializedTx</span><span class="ct-edcc4e">.</span><span class="ct-79c17f">toString</span><span class="ct-edcc4e">(</span><span class="ct-5f2cb5">'hex'</span><span class="ct-edcc4e">)</span><span class="ct-5f2cb5">}`</span></span><span class="line"><span class="ct-fb5c31"> );</span></span><span class="line"><span class="ct-fb5c31">}</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-de90bb">import</span><span class="ct-fb5c31"> { </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31"> } </span><span class="ct-de90bb">from</span><span class="ct-fb5c31"> </span><span class="ct-5f2cb5">'.'</span><span class="ct-fb5c31">;</span></span><span class="line"></span><span class="line"><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-79c17f">estimateFee</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-51f6e3">async</span><span class="ct-fb5c31"> ({</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">from</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">to</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">value</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">memo</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31">}) </span><span class="ct-51f6e3">=></span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">gasPrice</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">await</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">eth</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">getGasPrice</span><span class="ct-fb5c31">();</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-9c12e0">gasLimit</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">await</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">eth</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">estimateGas</span><span class="ct-fb5c31">({</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">from</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">to</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> value: </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toHex</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toWei</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">value</span><span class="ct-fb5c31">, </span><span class="ct-5f2cb5">'ether'</span><span class="ct-fb5c31">)),</span></span><span class="line"><span class="ct-fb5c31"> data: </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">asciiToHex</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">memo</span><span class="ct-fb5c31">),</span></span><span class="line"><span class="ct-fb5c31"> }).</span><span class="ct-79c17f">call</span><span class="ct-fb5c31">();</span></span><span class="line"><span class="ct-fb5c31"> </span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">return</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">utils</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">fromWei</span><span class="ct-fb5c31">(</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-478338">BigInt</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">gasPrice</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toString</span><span class="ct-fb5c31">())</span></span><span class="line"><span class="ct-fb5c31"> .</span><span class="ct-79c17f">multiply</span><span class="ct-fb5c31">(</span><span class="ct-478338">BigInt</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">gasLimit</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">toString</span><span class="ct-fb5c31">()))</span></span><span class="line"><span class="ct-fb5c31"> .</span><span class="ct-79c17f">toString</span><span class="ct-fb5c31">()</span></span><span class="line"><span class="ct-fb5c31"> );</span></span><span class="line"><span class="ct-fb5c31">}</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-de90bb">import</span><span class="ct-fb5c31"> { </span><span class="ct-1d037e">web3</span><span class="ct-fb5c31"> } </span><span class="ct-de90bb">from</span><span class="ct-fb5c31"> </span><span class="ct-5f2cb5">'.'</span><span class="ct-fb5c31">;</span></span><span class="line"></span><span class="line"><span class="ct-1d037e">web3</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">currentProvider</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">on</span><span class="ct-fb5c31">(</span><span class="ct-5f2cb5">'accountsChanged'</span><span class="ct-fb5c31">, </span><span class="ct-1d037e">callback</span><span class="ct-fb5c31">);</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-1d037e">ethereum</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">on</span><span class="ct-fb5c31">(</span><span class="ct-5f2cb5">'chainChanged'</span><span class="ct-fb5c31">, </span><span class="ct-1d037e">handler</span><span class="ct-abff62">:</span><span class="ct-fb5c31"> </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-1d037e">window</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">ethereum</span></span><span class="line"><span class="ct-fb5c31"> .</span><span class="ct-79c17f">request</span><span class="ct-fb5c31">({</span></span><span class="line"><span class="ct-fb5c31"> method: </span><span class="ct-5f2cb5">'wallet_watchAsset'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> params: {</span></span><span class="line"><span class="ct-fb5c31"> type: </span><span class="ct-5f2cb5">'ERC20'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> options: {</span></span><span class="line"><span class="ct-fb5c31"> address: </span><span class="ct-5f2cb5">'0xb60e8dd61c5d32be8058bb8eb970870f07233155'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> symbol: </span><span class="ct-5f2cb5">'FOO'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> decimals: </span><span class="ct-936d06">18</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> image: </span><span class="ct-5f2cb5">'https://foo.io/token-image.svg'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> },</span></span><span class="line"><span class="ct-fb5c31"> },</span></span><span class="line"><span class="ct-fb5c31"> })</span></span><span class="line"><span class="ct-639184"> .</span><span class="ct-14ea1e">then</span><span class="ct-639184">((</span><span class="ct-36ec46">success</span><span class="ct-639184">) </span><span class="ct-7adbe1">=></span><span class="ct-639184"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">if</span><span class="ct-fb5c31"> (</span><span class="ct-1d037e">success</span><span class="ct-fb5c31">) {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-1d037e">console</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">log</span><span class="ct-fb5c31">(</span><span class="ct-5f2cb5">'FOO successfully added to wallet!'</span><span class="ct-fb5c31">)</span></span><span class="line"><span class="ct-fb5c31"> } </span><span class="ct-de90bb">else</span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">throw</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">new</span><span class="ct-fb5c31"> </span><span class="ct-478338">Error</span><span class="ct-fb5c31">(</span><span class="ct-5f2cb5">'Something went wrong.'</span><span class="ct-fb5c31">)</span></span><span class="line"><span class="ct-fb5c31"> }</span></span><span class="line"><span class="ct-fb5c31"> })</span></span><span class="line"><span class="ct-fb5c31"> .</span><span class="ct-79c17f">catch</span><span class="ct-fb5c31">(</span><span class="ct-1d037e">console</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">error</span><span class="ct-fb5c31">)</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-51f6e3">const</span><span class="ct-fb5c31"> </span><span class="ct-79c17f">getChainID</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">=</span><span class="ct-fb5c31"> </span><span class="ct-51f6e3">async</span><span class="ct-fb5c31"> () </span><span class="ct-51f6e3">=></span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">return</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">ethereum</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">request</span><span class="ct-fb5c31">({ method: </span><span class="ct-5f2cb5">'eth_chainId'</span><span class="ct-fb5c31"> })</span></span><span class="line"><span class="ct-fb5c31">}</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-de90bb">try</span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">await</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">window</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">ethereum</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">request</span><span class="ct-fb5c31">({</span></span><span class="line"><span class="ct-fb5c31"> method: </span><span class="ct-5f2cb5">'wallet_switchEthereumChain'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> params: [{ chainId: </span><span class="ct-5f2cb5">'0x03'</span><span class="ct-fb5c31"> }], </span><span class="ct-a55713">// ropsten chainID (3) in hex</span></span><span class="line"><span class="ct-fb5c31"> });</span></span><span class="line"><span class="ct-fb5c31">} </span><span class="ct-de90bb">catch</span><span class="ct-fb5c31"> (</span><span class="ct-1d037e">switchError</span><span class="ct-fb5c31">) {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-a55713">// This error code indicates that the chain has not been added to MetaMask.</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">if</span><span class="ct-fb5c31"> (</span><span class="ct-1d037e">error</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">code</span><span class="ct-fb5c31"> </span><span class="ct-de90bb">===</span><span class="ct-fb5c31"> </span><span class="ct-936d06">4902</span><span class="ct-fb5c31">) {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">try</span><span class="ct-fb5c31"> {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-de90bb">await</span><span class="ct-fb5c31"> </span><span class="ct-1d037e">window</span><span class="ct-fb5c31">.</span><span class="ct-1d037e">ethereum</span><span class="ct-fb5c31">.</span><span class="ct-79c17f">request</span><span class="ct-fb5c31">({</span></span><span class="line"><span class="ct-fb5c31"> method: </span><span class="ct-5f2cb5">'wallet_addEthereumChain'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> params: [{ </span></span><span class="line"><span class="ct-fb5c31"> chainId: </span><span class="ct-5f2cb5">'0x03'</span><span class="ct-fb5c31">, </span><span class="ct-a55713">// ropsten chainID (3) in hex</span></span><span class="line"><span class="ct-fb5c31"> chainName: </span><span class="ct-5f2cb5">'Ropsten Test Network'</span><span class="ct-fb5c31">, </span></span><span class="line"><span class="ct-fb5c31"> nativeCurrency: { </span></span><span class="line"><span class="ct-fb5c31"> name: </span><span class="ct-5f2cb5">'ETH'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> symbol: </span><span class="ct-5f2cb5">'ETH'</span><span class="ct-fb5c31">,</span></span><span class="line"><span class="ct-fb5c31"> decimals: </span><span class="ct-936d06">18</span></span><span class="line"><span class="ct-fb5c31"> }, </span></span><span class="line"><span class="ct-fb5c31"> rpcUrls: [</span><span class="ct-5f2cb5">'https://ropsten.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161'</span><span class="ct-fb5c31">], </span></span><span class="line"><span class="ct-fb5c31"> blockExplorerUrls: [</span><span class="ct-5f2cb5">'https://ropsten.etherscan.io'</span><span class="ct-fb5c31">] </span></span><span class="line"><span class="ct-fb5c31"> }] ,</span></span><span class="line"><span class="ct-fb5c31"> });</span></span><span class="line"><span class="ct-fb5c31"> } </span><span class="ct-de90bb">catch</span><span class="ct-fb5c31"> (</span><span class="ct-1d037e">addError</span><span class="ct-fb5c31">) {</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-a55713">// handle "add" error</span></span><span class="line"><span class="ct-fb5c31"> }</span></span><span class="line"><span class="ct-fb5c31"> }</span></span><span class="line"><span class="ct-fb5c31"> </span><span class="ct-a55713">// handle other "switch" errors</span></span><span class="line"><span class="ct-fb5c31">}</span></span></code></pre><!--]--></div><style>.ct-936d06{color:#79C0FF}.ct-abff62{color:#C9D1D9}.ct-478338{color:#79C0FF}.ct-edcc4e{color:#A5D6FF}.ct-e83a17{color:#79C0FF}.ct-36ec46{color:#FFA657}.ct-5e9d96{color:#FF7B72}.ct-14ea1e{color:#D2A8FF}.ct-639184{color:#C9D1D9}.ct-7adbe1{color:#FF7B72}.ct-79c17f{color:#D2A8FF}.ct-9c12e0{color:#79C0FF}.ct-51f6e3{color:#FF7B72}.ct-a55713{color:#8B949E}.ct-5f2cb5{color:#A5D6FF}.ct-1d037e{color:#C9D1D9}.ct-fb5c31{color:#C9D1D9}.ct-de90bb{color:#FF7B72}.light .ct-de90bb{color:#859900}.light .ct-fb5c31{color:#657B83}.light .ct-1d037e{color:#268BD2}.light .ct-5f2cb5{color:#2AA198}.light .ct-a55713{color:#93A1A1}.light .ct-51f6e3{color:#073642}.light .ct-9c12e0{color:#268BD2}.light .ct-79c17f{color:#268BD2}.light .ct-7adbe1{color:#073642}.light .ct-639184{color:#657B83}.light .ct-14ea1e{color:#268BD2}.light .ct-5e9d96{color:#859900}.light .ct-36ec46{color:#657B83}.light .ct-e83a17{color:#859900}.light .ct-edcc4e{color:#657B83}.light .ct-478338{color:#859900}.light .ct-abff62{color:#859900}.light .ct-936d06{color:#D33682}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_1hfaq_22 _footer_1hfaq_22"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 2022) <a href="https://github.com/muerwre/" rel="noopener noreferrer" target="_blank">muerwre</a></div></footer></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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