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7d71d3748a
Author: Fedor Katurov <gotham48@gmail.com>
Date: Sun Nov 27 19:29:56 2022 +0600
added webgl basics
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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 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_kmqkz_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_kmqkz_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Obsidian</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/obsidian/self-hosted-obsidian-sync-with-couchdb" class="_link_192pu_66">Self Hosted Obsidian Sync With CouchDB</a></div><!--]--></div></div></div><div class="_row_kmqkz_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_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-86c952">import</span><span class="ct-b2e769"> </span><span class="ct-33622a">Web3</span><span class="ct-b2e769"> </span><span class="ct-86c952">from</span><span class="ct-b2e769"> </span><span class="ct-93bee0">'web3'</span><span class="ct-b2e769">;</span></span><span class="line"></span><span class="line"><span class="ct-a174b6">// URL of your node</span></span><span class="line"><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">PROVIDER_URL</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-93bee0">'https://...'</span><span class="ct-b2e769">;</span></span><span class="line"></span><span class="line"><span class="ct-86c952">export</span><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">web3</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-86c952">new</span><span class="ct-b2e769"> </span><span class="ct-7f4708">Web3</span><span class="ct-b2e769">(</span><span class="ct-33622a">Web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">givenProvider</span><span class="ct-b2e769"> </span><span class="ct-86c952">||</span><span class="ct-b2e769"> </span><span class="ct-5ed223">PROVIDER_URL</span><span class="ct-b2e769">);</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-89ee41">const</span><span class="ct-39b311"> </span><span class="ct-857f88">getBalance</span><span class="ct-39b311"> </span><span class="ct-4a2c79">=</span><span class="ct-39b311"> </span><span class="ct-89ee41">async</span><span class="ct-39b311"> (</span><span class="ct-ba13a8">address</span><span class="ct-4a2c79">:</span><span class="ct-39b311"> </span><span class="ct-63d511">string</span><span class="ct-39b311">) </span><span class="ct-89ee41">=></span><span class="ct-39b311"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">return</span><span class="ct-b2e769"> </span><span class="ct-86c952">await</span><span class="ct-b2e769"> </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">eth</span><span class="ct-b2e769">.</span><span class="ct-7f4708">getBalance</span><span class="ct-b2e769">(</span><span class="ct-33622a">address</span><span class="ct-b2e769">);</span></span><span class="line"><span class="ct-b2e769">}</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-a174b6">// first we need to authorize</span></span><span class="line"><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-7f4708">authorize</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-7fff4c">async</span><span class="ct-b2e769"> () </span><span class="ct-7fff4c">=></span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">await</span><span class="ct-b2e769"> </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">currentProvider</span><span class="ct-b2e769">.</span><span class="ct-7f4708">request</span><span class="ct-b2e769">({ method: </span><span class="ct-93bee0">'eth_requestAccounts'</span><span class="ct-b2e769"> });</span></span><span class="line"><span class="ct-b2e769">}</span></span><span class="line"></span><span class="line"><span class="ct-a174b6">// then we can get wallet address</span></span><span class="line"><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-7f4708">getCurrentAddressUser</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> () </span><span class="ct-7fff4c">=></span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">return</span><span class="ct-b2e769"> </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">currentProvider</span><span class="ct-b2e769">.</span><span class="ct-33622a">selectedAddress</span><span class="ct-b2e769">;</span></span><span class="line"><span class="ct-b2e769">}</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-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-7f4708">transfer</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-7fff4c">async</span><span class="ct-b2e769"> ({ </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">from</span><span class="ct-b2e769">, </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">to</span><span class="ct-b2e769">, </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">value</span><span class="ct-b2e769">, </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">memo</span><span class="ct-b2e769">, </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">privateKey</span><span class="ct-b2e769">, </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">gasLimit</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span></span><span class="line"><span class="ct-b2e769">}) </span><span class="ct-7fff4c">=></span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">nonce</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-86c952">await</span><span class="ct-b2e769"> </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">eth</span><span class="ct-b2e769">.</span><span class="ct-7f4708">getTransactionCount</span><span class="ct-b2e769">(</span><span class="ct-33622a">from</span><span class="ct-b2e769">);</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">gasPrice</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-86c952">await</span><span class="ct-b2e769"> </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">eth</span><span class="ct-b2e769">.</span><span class="ct-7f4708">getGasPrice</span><span class="ct-b2e769">();</span></span><span class="line"><span class="ct-b2e769"> </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">rawTx</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">from</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">to</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> value: </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toHex</span><span class="ct-b2e769">(</span><span class="ct-33622a">Web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toWei</span><span class="ct-b2e769">(</span><span class="ct-33622a">value</span><span class="ct-b2e769">, </span><span class="ct-93bee0">'ether'</span><span class="ct-b2e769">)),</span></span><span class="line"><span class="ct-b2e769"> gasLimit: </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toHex</span><span class="ct-b2e769">(</span><span class="ct-33622a">gasLimit</span><span class="ct-b2e769">),</span></span><span class="line"><span class="ct-b2e769"> gasPrice: </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toHex</span><span class="ct-b2e769">(</span><span class="ct-33622a">gasPrice</span><span class="ct-b2e769">),</span></span><span class="line"><span class="ct-b2e769"> nonce: </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toHex</span><span class="ct-b2e769">(</span><span class="ct-33622a">nonce</span><span class="ct-b2e769">),</span></span><span class="line"><span class="ct-b2e769"> data: </span><span class="ct-33622a">memo</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> };</span></span><span class="line"><span class="ct-b2e769"> </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">privateKeyBuffer</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-33622a">EthUtil</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toBuffer</span><span class="ct-b2e769">(</span><span class="ct-33622a">privateKey</span><span class="ct-b2e769">);</span></span><span class="line"><span class="ct-b2e769"> </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">tx</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-86c952">new</span><span class="ct-b2e769"> </span><span class="ct-7f4708">Transaction</span><span class="ct-b2e769">(</span><span class="ct-33622a">rawTx</span><span class="ct-b2e769">);</span></span><span class="line"><span class="ct-b2e769"> </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">tx</span><span class="ct-b2e769">.</span><span class="ct-7f4708">sign</span><span class="ct-b2e769">(</span><span class="ct-33622a">privateKeyBuffer</span><span class="ct-b2e769">);</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">serializedTx</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-33622a">tx</span><span class="ct-b2e769">.</span><span class="ct-7f4708">serialize</span><span class="ct-b2e769">();</span></span><span class="line"><span class="ct-b2e769"> </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">return</span><span class="ct-b2e769"> </span><span class="ct-5ed223">this</span><span class="ct-b2e769">.</span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">eth</span><span class="ct-b2e769">.</span><span class="ct-7f4708">sendSignedTransaction</span><span class="ct-b2e769">(</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-93bee0">`0x${</span><span class="ct-33622a">serializedTx</span><span class="ct-ea44bc">.</span><span class="ct-7f4708">toString</span><span class="ct-ea44bc">(</span><span class="ct-93bee0">'hex'</span><span class="ct-ea44bc">)</span><span class="ct-93bee0">}`</span></span><span class="line"><span class="ct-b2e769"> );</span></span><span class="line"><span class="ct-b2e769">}</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-86c952">import</span><span class="ct-b2e769"> { </span><span class="ct-33622a">web3</span><span class="ct-b2e769"> } </span><span class="ct-86c952">from</span><span class="ct-b2e769"> </span><span class="ct-93bee0">'.'</span><span class="ct-b2e769">;</span></span><span class="line"></span><span class="line"><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-7f4708">estimateFee</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-7fff4c">async</span><span class="ct-b2e769"> ({</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">from</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">to</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">value</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">memo</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769">}) </span><span class="ct-7fff4c">=></span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">gasPrice</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-86c952">await</span><span class="ct-b2e769"> </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">eth</span><span class="ct-b2e769">.</span><span class="ct-7f4708">getGasPrice</span><span class="ct-b2e769">();</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-5ed223">gasLimit</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-86c952">await</span><span class="ct-b2e769"> </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">eth</span><span class="ct-b2e769">.</span><span class="ct-7f4708">estimateGas</span><span class="ct-b2e769">({</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">from</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">to</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> value: </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toHex</span><span class="ct-b2e769">(</span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toWei</span><span class="ct-b2e769">(</span><span class="ct-33622a">value</span><span class="ct-b2e769">, </span><span class="ct-93bee0">'ether'</span><span class="ct-b2e769">)),</span></span><span class="line"><span class="ct-b2e769"> data: </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">asciiToHex</span><span class="ct-b2e769">(</span><span class="ct-33622a">memo</span><span class="ct-b2e769">),</span></span><span class="line"><span class="ct-b2e769"> }).</span><span class="ct-7f4708">call</span><span class="ct-b2e769">();</span></span><span class="line"><span class="ct-b2e769"> </span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">return</span><span class="ct-b2e769"> </span><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">utils</span><span class="ct-b2e769">.</span><span class="ct-7f4708">fromWei</span><span class="ct-b2e769">(</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-603403">BigInt</span><span class="ct-b2e769">(</span><span class="ct-33622a">gasPrice</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toString</span><span class="ct-b2e769">())</span></span><span class="line"><span class="ct-b2e769"> .</span><span class="ct-7f4708">multiply</span><span class="ct-b2e769">(</span><span class="ct-603403">BigInt</span><span class="ct-b2e769">(</span><span class="ct-33622a">gasLimit</span><span class="ct-b2e769">.</span><span class="ct-7f4708">toString</span><span class="ct-b2e769">()))</span></span><span class="line"><span class="ct-b2e769"> .</span><span class="ct-7f4708">toString</span><span class="ct-b2e769">()</span></span><span class="line"><span class="ct-b2e769"> );</span></span><span class="line"><span class="ct-b2e769">}</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-86c952">import</span><span class="ct-b2e769"> { </span><span class="ct-33622a">web3</span><span class="ct-b2e769"> } </span><span class="ct-86c952">from</span><span class="ct-b2e769"> </span><span class="ct-93bee0">'.'</span><span class="ct-b2e769">;</span></span><span class="line"></span><span class="line"><span class="ct-33622a">web3</span><span class="ct-b2e769">.</span><span class="ct-33622a">currentProvider</span><span class="ct-b2e769">.</span><span class="ct-7f4708">on</span><span class="ct-b2e769">(</span><span class="ct-93bee0">'accountsChanged'</span><span class="ct-b2e769">, </span><span class="ct-33622a">callback</span><span class="ct-b2e769">);</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-33622a">ethereum</span><span class="ct-b2e769">.</span><span class="ct-7f4708">on</span><span class="ct-b2e769">(</span><span class="ct-93bee0">'chainChanged'</span><span class="ct-b2e769">, </span><span class="ct-33622a">handler</span><span class="ct-e2aa9c">:</span><span class="ct-b2e769"> </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-33622a">window</span><span class="ct-b2e769">.</span><span class="ct-33622a">ethereum</span></span><span class="line"><span class="ct-b2e769"> .</span><span class="ct-7f4708">request</span><span class="ct-b2e769">({</span></span><span class="line"><span class="ct-b2e769"> method: </span><span class="ct-93bee0">'wallet_watchAsset'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> params: {</span></span><span class="line"><span class="ct-b2e769"> type: </span><span class="ct-93bee0">'ERC20'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> options: {</span></span><span class="line"><span class="ct-b2e769"> address: </span><span class="ct-93bee0">'0xb60e8dd61c5d32be8058bb8eb970870f07233155'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> symbol: </span><span class="ct-93bee0">'FOO'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> decimals: </span><span class="ct-c0725c">18</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> image: </span><span class="ct-93bee0">'https://foo.io/token-image.svg'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> },</span></span><span class="line"><span class="ct-b2e769"> },</span></span><span class="line"><span class="ct-b2e769"> })</span></span><span class="line"><span class="ct-39b311"> .</span><span class="ct-857f88">then</span><span class="ct-39b311">((</span><span class="ct-ba13a8">success</span><span class="ct-39b311">) </span><span class="ct-89ee41">=></span><span class="ct-39b311"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">if</span><span class="ct-b2e769"> (</span><span class="ct-33622a">success</span><span class="ct-b2e769">) {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-33622a">console</span><span class="ct-b2e769">.</span><span class="ct-7f4708">log</span><span class="ct-b2e769">(</span><span class="ct-93bee0">'FOO successfully added to wallet!'</span><span class="ct-b2e769">)</span></span><span class="line"><span class="ct-b2e769"> } </span><span class="ct-86c952">else</span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">throw</span><span class="ct-b2e769"> </span><span class="ct-86c952">new</span><span class="ct-b2e769"> </span><span class="ct-603403">Error</span><span class="ct-b2e769">(</span><span class="ct-93bee0">'Something went wrong.'</span><span class="ct-b2e769">)</span></span><span class="line"><span class="ct-b2e769"> }</span></span><span class="line"><span class="ct-b2e769"> })</span></span><span class="line"><span class="ct-b2e769"> .</span><span class="ct-7f4708">catch</span><span class="ct-b2e769">(</span><span class="ct-33622a">console</span><span class="ct-b2e769">.</span><span class="ct-33622a">error</span><span class="ct-b2e769">)</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-7fff4c">const</span><span class="ct-b2e769"> </span><span class="ct-7f4708">getChainID</span><span class="ct-b2e769"> </span><span class="ct-86c952">=</span><span class="ct-b2e769"> </span><span class="ct-7fff4c">async</span><span class="ct-b2e769"> () </span><span class="ct-7fff4c">=></span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">return</span><span class="ct-b2e769"> </span><span class="ct-33622a">ethereum</span><span class="ct-b2e769">.</span><span class="ct-7f4708">request</span><span class="ct-b2e769">({ method: </span><span class="ct-93bee0">'eth_chainId'</span><span class="ct-b2e769"> })</span></span><span class="line"><span class="ct-b2e769">}</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-86c952">try</span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">await</span><span class="ct-b2e769"> </span><span class="ct-33622a">window</span><span class="ct-b2e769">.</span><span class="ct-33622a">ethereum</span><span class="ct-b2e769">.</span><span class="ct-7f4708">request</span><span class="ct-b2e769">({</span></span><span class="line"><span class="ct-b2e769"> method: </span><span class="ct-93bee0">'wallet_switchEthereumChain'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> params: [{ chainId: </span><span class="ct-93bee0">'0x03'</span><span class="ct-b2e769"> }], </span><span class="ct-a174b6">// ropsten chainID (3) in hex</span></span><span class="line"><span class="ct-b2e769"> });</span></span><span class="line"><span class="ct-b2e769">} </span><span class="ct-86c952">catch</span><span class="ct-b2e769"> (</span><span class="ct-33622a">switchError</span><span class="ct-b2e769">) {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-a174b6">// This error code indicates that the chain has not been added to MetaMask.</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">if</span><span class="ct-b2e769"> (</span><span class="ct-33622a">error</span><span class="ct-b2e769">.</span><span class="ct-33622a">code</span><span class="ct-b2e769"> </span><span class="ct-86c952">===</span><span class="ct-b2e769"> </span><span class="ct-c0725c">4902</span><span class="ct-b2e769">) {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">try</span><span class="ct-b2e769"> {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-86c952">await</span><span class="ct-b2e769"> </span><span class="ct-33622a">window</span><span class="ct-b2e769">.</span><span class="ct-33622a">ethereum</span><span class="ct-b2e769">.</span><span class="ct-7f4708">request</span><span class="ct-b2e769">({</span></span><span class="line"><span class="ct-b2e769"> method: </span><span class="ct-93bee0">'wallet_addEthereumChain'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> params: [{ </span></span><span class="line"><span class="ct-b2e769"> chainId: </span><span class="ct-93bee0">'0x03'</span><span class="ct-b2e769">, </span><span class="ct-a174b6">// ropsten chainID (3) in hex</span></span><span class="line"><span class="ct-b2e769"> chainName: </span><span class="ct-93bee0">'Ropsten Test Network'</span><span class="ct-b2e769">, </span></span><span class="line"><span class="ct-b2e769"> nativeCurrency: { </span></span><span class="line"><span class="ct-b2e769"> name: </span><span class="ct-93bee0">'ETH'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> symbol: </span><span class="ct-93bee0">'ETH'</span><span class="ct-b2e769">,</span></span><span class="line"><span class="ct-b2e769"> decimals: </span><span class="ct-c0725c">18</span></span><span class="line"><span class="ct-b2e769"> }, </span></span><span class="line"><span class="ct-b2e769"> rpcUrls: [</span><span class="ct-93bee0">'https://ropsten.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161'</span><span class="ct-b2e769">], </span></span><span class="line"><span class="ct-b2e769"> blockExplorerUrls: [</span><span class="ct-93bee0">'https://ropsten.etherscan.io'</span><span class="ct-b2e769">] </span></span><span class="line"><span class="ct-b2e769"> }] ,</span></span><span class="line"><span class="ct-b2e769"> });</span></span><span class="line"><span class="ct-b2e769"> } </span><span class="ct-86c952">catch</span><span class="ct-b2e769"> (</span><span class="ct-33622a">addError</span><span class="ct-b2e769">) {</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-a174b6">// handle "add" error</span></span><span class="line"><span class="ct-b2e769"> }</span></span><span class="line"><span class="ct-b2e769"> }</span></span><span class="line"><span class="ct-b2e769"> </span><span class="ct-a174b6">// handle other "switch" errors</span></span><span class="line"><span class="ct-b2e769">}</span></span></code></pre><!--]--></div><style>.ct-c0725c{color:#79C0FF}.ct-e2aa9c{color:#C9D1D9}.ct-603403{color:#79C0FF}.ct-ea44bc{color:#A5D6FF}.ct-63d511{color:#79C0FF}.ct-ba13a8{color:#FFA657}.ct-4a2c79{color:#FF7B72}.ct-857f88{color:#D2A8FF}.ct-39b311{color:#C9D1D9}.ct-89ee41{color:#FF7B72}.ct-7f4708{color:#D2A8FF}.ct-5ed223{color:#79C0FF}.ct-7fff4c{color:#FF7B72}.ct-a174b6{color:#8B949E}.ct-93bee0{color:#A5D6FF}.ct-33622a{color:#C9D1D9}.ct-b2e769{color:#C9D1D9}.ct-86c952{color:#FF7B72}.light .ct-86c952{color:#859900}.light .ct-b2e769{color:#657B83}.light .ct-33622a{color:#268BD2}.light .ct-93bee0{color:#2AA198}.light .ct-a174b6{color:#93A1A1}.light .ct-7fff4c{color:#073642}.light .ct-5ed223{color:#268BD2}.light .ct-7f4708{color:#268BD2}.light .ct-89ee41{color:#073642}.light .ct-39b311{color:#657B83}.light .ct-857f88{color:#268BD2}.light .ct-4a2c79{color:#859900}.light .ct-ba13a8{color:#657B83}.light .ct-63d511{color:#859900}.light .ct-ea44bc{color:#657B83}.light .ct-603403{color:#859900}.light .ct-e2aa9c{color:#859900}.light .ct-c0725c{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 - 2022) <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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