ethers.js/docs/v4/cookbook-react.html
2020-06-11 16:29:05 -04:00

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<div class="section" id="react-native">
<h1>React Native<a class="headerlink" href="#react-native" title="Permalink to this headline"></a></h1>
<p>The React Native environment has a lot of little quirks, so this
documentation is aimed at helping smooth those over.</p>
<p>Please feel free to create issues on GitHub for recommendations and
additions to this document.</p>
<hr class="docutils" />
<div class="section" id="shims">
<h2>Shims<a class="headerlink" href="#shims" title="Permalink to this headline"></a></h2>
<p>There are several pieces of functionality missing from the current version
of React-Native. Here is a list of functionality the <code class="docutils literal notranslate"><span class="pre">ethers/dist/shims</span></code> will
provide if unavailable:</p>
<blockquote>
<div><ul class="simple">
<li><code class="docutils literal notranslate"><span class="pre">ArrayBuffer.isView</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">atob</span></code> and <code class="docutils literal notranslate"><span class="pre">btoa</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">nextTick</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">Promise</span></code></li>
<li><code class="docutils literal notranslate"><span class="pre">String.prototype.normalize</span></code></li>
</ul>
</div></blockquote>
<div class="literal-block-wrapper docutils container" id="id1">
<div class="code-block-caption"><span class="caption-text"><em>Importing into React-Native</em></span><a class="headerlink" href="#id1" title="Permalink to this code"></a></div>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// Import the required shims</span>
<span class="kr">import</span> <span class="s1">&#39;ethers/dist/shims.js&#39;</span><span class="p">;</span>
<span class="c1">// Import the ethers library</span>
<span class="kr">import</span> <span class="p">{</span> <span class="nx">ethers</span> <span class="p">}</span> <span class="nx">from</span> <span class="s1">&#39;ethers&#39;</span><span class="p">;</span>
</pre></div>
</div>
</div>
<dl class="docutils">
<dt><strong>Note</strong></dt>
<dd>This file <strong>must</strong> be minified, since the React-Native <code class="docutils literal notranslate"><span class="pre">require</span></code>
seems to hijack the variable name <code class="docutils literal notranslate"><span class="pre">require</span></code>, even when encapsulated
inside a closure. The minification process replaces the <code class="docutils literal notranslate"><span class="pre">require</span></code>
with a mangled name, so that there is no collision. This is hacky
and in the future a better method would be preferred. Suggestions?</dd>
<dt><strong>Note</strong></dt>
<dd>As we find additional features not generally available, they will
be added to this shim file. It is targetted toward platforms where
build-size is not critical, so functionality is favored over keeping
the size small.</dd>
</dl>
</div>
<hr class="docutils" />
<div class="section" id="wordlists">
<h2>Wordlists<a class="headerlink" href="#wordlists" title="Permalink to this headline"></a></h2>
<p>React-Native will pull in the browser version of ethers, which does not have
all the additional word lists, by default. Each desired wordlist must be
separately imported.</p>
<div class="literal-block-wrapper docutils container" id="id2">
<div class="code-block-caption"><span class="caption-text"><em>Importing languages into React-Native</em></span><a class="headerlink" href="#id2" title="Permalink to this code"></a></div>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kr">import</span> <span class="p">{</span>
<span class="nx">es</span><span class="p">,</span> <span class="c1">// Spanish</span>
<span class="nx">fr</span><span class="p">,</span> <span class="c1">// French</span>
<span class="nx">it</span><span class="p">,</span> <span class="c1">// Italian</span>
<span class="nx">ja</span><span class="p">,</span> <span class="c1">// Japanese</span>
<span class="nx">ko</span><span class="p">,</span> <span class="c1">// Korean</span>
<span class="nx">zh_ch</span><span class="p">,</span> <span class="c1">// Chinese (simplified)</span>
<span class="nx">zh_tw</span> <span class="c1">// Chinese (tranditional)</span>
<span class="p">}</span> <span class="nx">from</span> <span class="s1">&#39;ethers/wordlists&#39;</span><span class="p">;</span>
</pre></div>
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<div class="section" id="other-notes">
<h2>Other Notes<a class="headerlink" href="#other-notes" title="Permalink to this headline"></a></h2>
<dl class="docutils">
<dt><strong>console.log</strong></dt>
<dd>The use of <code class="docutils literal notranslate"><span class="pre">console.log</span></code> in React Native <a class="reference external" href="https://docs.expo.io/versions/latest/react-native/performance/#using-consolelog-statements">can substantially impact performance</a>.
For this reason, you may wish to reduce the log level to not show info and warnings.</dd>
</dl>
<div class="literal-block-wrapper docutils container" id="id3">
<div class="code-block-caption"><span class="caption-text"><em>Change Log Level</em></span><a class="headerlink" href="#id3" title="Permalink to this code"></a></div>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="c1">// The default is &quot;info&quot;; other options</span>
<span class="c1">// &quot;debug&quot;, &quot;info&quot;, &quot;warn&quot;, &quot;error&quot;, &quot;off&quot;</span>
<span class="nx">ethers</span><span class="p">.</span><span class="nx">errors</span><span class="p">.</span><span class="nx">setLogLevel</span><span class="p">(</span><span class="s2">&quot;error&quot;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<hr class="docutils" />
<p>TODO: Include instructions on installing crypto performance</p>
<ul class="simple">
<li>scrypt (it is VERY slow in React Native; too slow to be functional)</li>
</ul>
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