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Author: Fedor Katurov <gotham48@gmail.com>
Date: Thu Nov 10 14:45:38 2022 +0600
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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_16c5m_17"><div class="_content_16c5m_93"><div class="_wrapper_1km9a_1" hastransition="true"><div class="_content_1km9a_13"><button class="_theme_toggle_1km9a_23 _button_jz7in_1 _theme_toggle_1km9a_23"><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-24d869">import</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">Web3</span><span class="ct-21958f"> </span><span class="ct-24d869">from</span><span class="ct-21958f"> </span><span class="ct-e66a68">'web3'</span><span class="ct-21958f">;</span></span><span class="line"></span><span class="line"><span class="ct-cf2fd9">// URL of your node</span></span><span class="line"><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">PROVIDER_URL</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-e66a68">'https://...'</span><span class="ct-21958f">;</span></span><span class="line"></span><span class="line"><span class="ct-24d869">export</span><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">web3</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-24d869">new</span><span class="ct-21958f"> </span><span class="ct-ee7b61">Web3</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">Web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">givenProvider</span><span class="ct-21958f"> </span><span class="ct-24d869">||</span><span class="ct-21958f"> </span><span class="ct-1011d9">PROVIDER_URL</span><span class="ct-21958f">);</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-00776f">const</span><span class="ct-1d18f5"> </span><span class="ct-0789c4">getBalance</span><span class="ct-1d18f5"> </span><span class="ct-1220fe">=</span><span class="ct-1d18f5"> </span><span class="ct-00776f">async</span><span class="ct-1d18f5"> (</span><span class="ct-1358c0">address</span><span class="ct-1220fe">:</span><span class="ct-1d18f5"> </span><span class="ct-e3f13d">string</span><span class="ct-1d18f5">) </span><span class="ct-00776f">=></span><span class="ct-1d18f5"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">return</span><span class="ct-21958f"> </span><span class="ct-24d869">await</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">eth</span><span class="ct-21958f">.</span><span class="ct-ee7b61">getBalance</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">address</span><span class="ct-21958f">);</span></span><span class="line"><span class="ct-21958f">}</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-cf2fd9">// first we need to authorize</span></span><span class="line"><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-ee7b61">authorize</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-6a4b38">async</span><span class="ct-21958f"> () </span><span class="ct-6a4b38">=></span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">await</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">currentProvider</span><span class="ct-21958f">.</span><span class="ct-ee7b61">request</span><span class="ct-21958f">({ method: </span><span class="ct-e66a68">'eth_requestAccounts'</span><span class="ct-21958f"> });</span></span><span class="line"><span class="ct-21958f">}</span></span><span class="line"></span><span class="line"><span class="ct-cf2fd9">// then we can get wallet address</span></span><span class="line"><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-ee7b61">getCurrentAddressUser</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> () </span><span class="ct-6a4b38">=></span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">return</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">currentProvider</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">selectedAddress</span><span class="ct-21958f">;</span></span><span class="line"><span class="ct-21958f">}</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-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-ee7b61">transfer</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-6a4b38">async</span><span class="ct-21958f"> ({ </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">from</span><span class="ct-21958f">, </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">to</span><span class="ct-21958f">, </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">value</span><span class="ct-21958f">, </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">memo</span><span class="ct-21958f">, </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">privateKey</span><span class="ct-21958f">, </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">gasLimit</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span></span><span class="line"><span class="ct-21958f">}) </span><span class="ct-6a4b38">=></span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">nonce</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-24d869">await</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">eth</span><span class="ct-21958f">.</span><span class="ct-ee7b61">getTransactionCount</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">from</span><span class="ct-21958f">);</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">gasPrice</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-24d869">await</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">eth</span><span class="ct-21958f">.</span><span class="ct-ee7b61">getGasPrice</span><span class="ct-21958f">();</span></span><span class="line"><span class="ct-21958f"> </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">rawTx</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">from</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">to</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> value: </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toHex</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">Web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toWei</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">value</span><span class="ct-21958f">, </span><span class="ct-e66a68">'ether'</span><span class="ct-21958f">)),</span></span><span class="line"><span class="ct-21958f"> gasLimit: </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toHex</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">gasLimit</span><span class="ct-21958f">),</span></span><span class="line"><span class="ct-21958f"> gasPrice: </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toHex</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">gasPrice</span><span class="ct-21958f">),</span></span><span class="line"><span class="ct-21958f"> nonce: </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toHex</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">nonce</span><span class="ct-21958f">),</span></span><span class="line"><span class="ct-21958f"> data: </span><span class="ct-bd9d4d">memo</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> };</span></span><span class="line"><span class="ct-21958f"> </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">privateKeyBuffer</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">EthUtil</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toBuffer</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">privateKey</span><span class="ct-21958f">);</span></span><span class="line"><span class="ct-21958f"> </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">tx</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-24d869">new</span><span class="ct-21958f"> </span><span class="ct-ee7b61">Transaction</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">rawTx</span><span class="ct-21958f">);</span></span><span class="line"><span class="ct-21958f"> </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">tx</span><span class="ct-21958f">.</span><span class="ct-ee7b61">sign</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">privateKeyBuffer</span><span class="ct-21958f">);</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">serializedTx</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">tx</span><span class="ct-21958f">.</span><span class="ct-ee7b61">serialize</span><span class="ct-21958f">();</span></span><span class="line"><span class="ct-21958f"> </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">return</span><span class="ct-21958f"> </span><span class="ct-1011d9">this</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">eth</span><span class="ct-21958f">.</span><span class="ct-ee7b61">sendSignedTransaction</span><span class="ct-21958f">(</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-e66a68">`0x${</span><span class="ct-bd9d4d">serializedTx</span><span class="ct-ab73b8">.</span><span class="ct-ee7b61">toString</span><span class="ct-ab73b8">(</span><span class="ct-e66a68">'hex'</span><span class="ct-ab73b8">)</span><span class="ct-e66a68">}`</span></span><span class="line"><span class="ct-21958f"> );</span></span><span class="line"><span class="ct-21958f">}</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-24d869">import</span><span class="ct-21958f"> { </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f"> } </span><span class="ct-24d869">from</span><span class="ct-21958f"> </span><span class="ct-e66a68">'.'</span><span class="ct-21958f">;</span></span><span class="line"></span><span class="line"><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-ee7b61">estimateFee</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-6a4b38">async</span><span class="ct-21958f"> ({</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">from</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">to</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">value</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">memo</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f">}) </span><span class="ct-6a4b38">=></span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">gasPrice</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-24d869">await</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">eth</span><span class="ct-21958f">.</span><span class="ct-ee7b61">getGasPrice</span><span class="ct-21958f">();</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-1011d9">gasLimit</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-24d869">await</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">eth</span><span class="ct-21958f">.</span><span class="ct-ee7b61">estimateGas</span><span class="ct-21958f">({</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">from</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">to</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> value: </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toHex</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toWei</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">value</span><span class="ct-21958f">, </span><span class="ct-e66a68">'ether'</span><span class="ct-21958f">)),</span></span><span class="line"><span class="ct-21958f"> data: </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">asciiToHex</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">memo</span><span class="ct-21958f">),</span></span><span class="line"><span class="ct-21958f"> }).</span><span class="ct-ee7b61">call</span><span class="ct-21958f">();</span></span><span class="line"><span class="ct-21958f"> </span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">return</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">utils</span><span class="ct-21958f">.</span><span class="ct-ee7b61">fromWei</span><span class="ct-21958f">(</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-533f2e">BigInt</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">gasPrice</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toString</span><span class="ct-21958f">())</span></span><span class="line"><span class="ct-21958f"> .</span><span class="ct-ee7b61">multiply</span><span class="ct-21958f">(</span><span class="ct-533f2e">BigInt</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">gasLimit</span><span class="ct-21958f">.</span><span class="ct-ee7b61">toString</span><span class="ct-21958f">()))</span></span><span class="line"><span class="ct-21958f"> .</span><span class="ct-ee7b61">toString</span><span class="ct-21958f">()</span></span><span class="line"><span class="ct-21958f"> );</span></span><span class="line"><span class="ct-21958f">}</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-24d869">import</span><span class="ct-21958f"> { </span><span class="ct-bd9d4d">web3</span><span class="ct-21958f"> } </span><span class="ct-24d869">from</span><span class="ct-21958f"> </span><span class="ct-e66a68">'.'</span><span class="ct-21958f">;</span></span><span class="line"></span><span class="line"><span class="ct-bd9d4d">web3</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">currentProvider</span><span class="ct-21958f">.</span><span class="ct-ee7b61">on</span><span class="ct-21958f">(</span><span class="ct-e66a68">'accountsChanged'</span><span class="ct-21958f">, </span><span class="ct-bd9d4d">callback</span><span class="ct-21958f">);</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-bd9d4d">ethereum</span><span class="ct-21958f">.</span><span class="ct-ee7b61">on</span><span class="ct-21958f">(</span><span class="ct-e66a68">'chainChanged'</span><span class="ct-21958f">, </span><span class="ct-bd9d4d">handler</span><span class="ct-122a51">:</span><span class="ct-21958f"> </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-bd9d4d">window</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">ethereum</span></span><span class="line"><span class="ct-21958f"> .</span><span class="ct-ee7b61">request</span><span class="ct-21958f">({</span></span><span class="line"><span class="ct-21958f"> method: </span><span class="ct-e66a68">'wallet_watchAsset'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> params: {</span></span><span class="line"><span class="ct-21958f"> type: </span><span class="ct-e66a68">'ERC20'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> options: {</span></span><span class="line"><span class="ct-21958f"> address: </span><span class="ct-e66a68">'0xb60e8dd61c5d32be8058bb8eb970870f07233155'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> symbol: </span><span class="ct-e66a68">'FOO'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> decimals: </span><span class="ct-7c8dba">18</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> image: </span><span class="ct-e66a68">'https://foo.io/token-image.svg'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> },</span></span><span class="line"><span class="ct-21958f"> },</span></span><span class="line"><span class="ct-21958f"> })</span></span><span class="line"><span class="ct-1d18f5"> .</span><span class="ct-0789c4">then</span><span class="ct-1d18f5">((</span><span class="ct-1358c0">success</span><span class="ct-1d18f5">) </span><span class="ct-00776f">=></span><span class="ct-1d18f5"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">if</span><span class="ct-21958f"> (</span><span class="ct-bd9d4d">success</span><span class="ct-21958f">) {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-bd9d4d">console</span><span class="ct-21958f">.</span><span class="ct-ee7b61">log</span><span class="ct-21958f">(</span><span class="ct-e66a68">'FOO successfully added to wallet!'</span><span class="ct-21958f">)</span></span><span class="line"><span class="ct-21958f"> } </span><span class="ct-24d869">else</span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">throw</span><span class="ct-21958f"> </span><span class="ct-24d869">new</span><span class="ct-21958f"> </span><span class="ct-533f2e">Error</span><span class="ct-21958f">(</span><span class="ct-e66a68">'Something went wrong.'</span><span class="ct-21958f">)</span></span><span class="line"><span class="ct-21958f"> }</span></span><span class="line"><span class="ct-21958f"> })</span></span><span class="line"><span class="ct-21958f"> .</span><span class="ct-ee7b61">catch</span><span class="ct-21958f">(</span><span class="ct-bd9d4d">console</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">error</span><span class="ct-21958f">)</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-6a4b38">const</span><span class="ct-21958f"> </span><span class="ct-ee7b61">getChainID</span><span class="ct-21958f"> </span><span class="ct-24d869">=</span><span class="ct-21958f"> </span><span class="ct-6a4b38">async</span><span class="ct-21958f"> () </span><span class="ct-6a4b38">=></span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">return</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">ethereum</span><span class="ct-21958f">.</span><span class="ct-ee7b61">request</span><span class="ct-21958f">({ method: </span><span class="ct-e66a68">'eth_chainId'</span><span class="ct-21958f"> })</span></span><span class="line"><span class="ct-21958f">}</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-24d869">try</span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">await</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">window</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">ethereum</span><span class="ct-21958f">.</span><span class="ct-ee7b61">request</span><span class="ct-21958f">({</span></span><span class="line"><span class="ct-21958f"> method: </span><span class="ct-e66a68">'wallet_switchEthereumChain'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> params: [{ chainId: </span><span class="ct-e66a68">'0x03'</span><span class="ct-21958f"> }], </span><span class="ct-cf2fd9">// ropsten chainID (3) in hex</span></span><span class="line"><span class="ct-21958f"> });</span></span><span class="line"><span class="ct-21958f">} </span><span class="ct-24d869">catch</span><span class="ct-21958f"> (</span><span class="ct-bd9d4d">switchError</span><span class="ct-21958f">) {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-cf2fd9">// This error code indicates that the chain has not been added to MetaMask.</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">if</span><span class="ct-21958f"> (</span><span class="ct-bd9d4d">error</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">code</span><span class="ct-21958f"> </span><span class="ct-24d869">===</span><span class="ct-21958f"> </span><span class="ct-7c8dba">4902</span><span class="ct-21958f">) {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">try</span><span class="ct-21958f"> {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-24d869">await</span><span class="ct-21958f"> </span><span class="ct-bd9d4d">window</span><span class="ct-21958f">.</span><span class="ct-bd9d4d">ethereum</span><span class="ct-21958f">.</span><span class="ct-ee7b61">request</span><span class="ct-21958f">({</span></span><span class="line"><span class="ct-21958f"> method: </span><span class="ct-e66a68">'wallet_addEthereumChain'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> params: [{ </span></span><span class="line"><span class="ct-21958f"> chainId: </span><span class="ct-e66a68">'0x03'</span><span class="ct-21958f">, </span><span class="ct-cf2fd9">// ropsten chainID (3) in hex</span></span><span class="line"><span class="ct-21958f"> chainName: </span><span class="ct-e66a68">'Ropsten Test Network'</span><span class="ct-21958f">, </span></span><span class="line"><span class="ct-21958f"> nativeCurrency: { </span></span><span class="line"><span class="ct-21958f"> name: </span><span class="ct-e66a68">'ETH'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> symbol: </span><span class="ct-e66a68">'ETH'</span><span class="ct-21958f">,</span></span><span class="line"><span class="ct-21958f"> decimals: </span><span class="ct-7c8dba">18</span></span><span class="line"><span class="ct-21958f"> }, </span></span><span class="line"><span class="ct-21958f"> rpcUrls: [</span><span class="ct-e66a68">'https://ropsten.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161'</span><span class="ct-21958f">], </span></span><span class="line"><span class="ct-21958f"> blockExplorerUrls: [</span><span class="ct-e66a68">'https://ropsten.etherscan.io'</span><span class="ct-21958f">] </span></span><span class="line"><span class="ct-21958f"> }] ,</span></span><span class="line"><span class="ct-21958f"> });</span></span><span class="line"><span class="ct-21958f"> } </span><span class="ct-24d869">catch</span><span class="ct-21958f"> (</span><span class="ct-bd9d4d">addError</span><span class="ct-21958f">) {</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-cf2fd9">// handle "add" error</span></span><span class="line"><span class="ct-21958f"> }</span></span><span class="line"><span class="ct-21958f"> }</span></span><span class="line"><span class="ct-21958f"> </span><span class="ct-cf2fd9">// handle other "switch" errors</span></span><span class="line"><span class="ct-21958f">}</span></span></code></pre><!--]--></div><style>.ct-7c8dba{color:#79C0FF}.ct-122a51{color:#C9D1D9}.ct-533f2e{color:#79C0FF}.ct-ab73b8{color:#A5D6FF}.ct-e3f13d{color:#79C0FF}.ct-1358c0{color:#FFA657}.ct-1220fe{color:#FF7B72}.ct-0789c4{color:#D2A8FF}.ct-1d18f5{color:#C9D1D9}.ct-00776f{color:#FF7B72}.ct-ee7b61{color:#D2A8FF}.ct-1011d9{color:#79C0FF}.ct-6a4b38{color:#FF7B72}.ct-cf2fd9{color:#8B949E}.ct-e66a68{color:#A5D6FF}.ct-bd9d4d{color:#C9D1D9}.ct-21958f{color:#C9D1D9}.ct-24d869{color:#FF7B72}.light .ct-24d869{color:#859900}.light .ct-21958f{color:#657B83}.light .ct-bd9d4d{color:#268BD2}.light .ct-e66a68{color:#2AA198}.light .ct-cf2fd9{color:#93A1A1}.light .ct-6a4b38{color:#073642}.light .ct-1011d9{color:#268BD2}.light .ct-ee7b61{color:#268BD2}.light .ct-00776f{color:#073642}.light .ct-1d18f5{color:#657B83}.light .ct-0789c4{color:#268BD2}.light .ct-1220fe{color:#859900}.light .ct-1358c0{color:#657B83}.light .ct-e3f13d{color:#859900}.light .ct-ab73b8{color:#657B83}.light .ct-533f2e{color:#859900}.light .ct-122a51{color:#859900}.light .ct-7c8dba{color:#D33682}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_1km9a_17 _footer_1km9a_17"><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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