ts-simple-ast
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TypeScript compiler wrapper for AST navigation and code generation.
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<!--<p class="subText">Simple way to navigate and manipulate the TypeScript AST.</p>-->
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<h2 id="decorators">Decorators</h2>
<p>Decorators can be retrieved from class related nodes by calling the <code class="highlighter-rouge">getDecorators()</code> method.</p>
<div class="language-typescript highlighter-rouge"><pre class="highlight"><code><span class="kd">const</span> <span class="nx">decorators</span> <span class="o">=</span> <span class="nx">classDeclaration</span><span class="p">.</span><span class="nx">getDecorators</span><span class="p">();</span>
</code></pre>
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<h3 id="name">Name</h3>
<p>You can get the name or fully qualified name of a decorator by using the <code class="highlighter-rouge">getName()</code> or <code class="highlighter-rouge">getFullName()</code> functions respectively.</p>
<p>For example, given the following code:</p>
<div class="language-typescript highlighter-rouge"><pre class="highlight"><code><span class="err">@</span><span class="nx">obj</span><span class="p">.</span><span class="nx">decorator</span>
<span class="kd">function</span> <span class="nx">myFunction</span><span class="p">()</span> <span class="p">{</span>
<span class="p">}</span>
</code></pre>
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<p>The following happens:</p>
<div class="language-typescript highlighter-rouge"><pre class="highlight"><code><span class="nx">decorator</span><span class="p">.</span><span class="nx">getName</span><span class="p">();</span> <span class="c1">// decorator</span>
<span class="nx">decorator</span><span class="p">.</span><span class="nx">getFullName</span><span class="p">();</span> <span class="c1">// obj.decorator</span>
</code></pre>
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<h3 id="decorator-factory">Decorator factory</h3>
<p>Decorators with parenthesis (ex. <code class="highlighter-rouge">@decorator(3)</code>) are decorator factories, while decorators without (ex. <code class="highlighter-rouge">@decorator</code>) are not.</p>
<div class="language-typescript highlighter-rouge"><pre class="highlight"><code><span class="nx">decorator</span><span class="p">.</span><span class="nx">isDecoratorFactory</span><span class="p">();</span> <span class="c1">// returns: boolean</span>
</code></pre>
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<h3 id="arguments">Arguments</h3>
<p>Decorators with parenthesis are call expressions.</p>
<p>Call expressions are currently not implemented in this library, so you will
need to access the information about it by getting the call expression’s underlying compiler node:</p>
<div class="language-typescript highlighter-rouge"><pre class="highlight"><code><span class="c1">// must be a decorator factory, otherwise getCallExpression will return undefined</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">decorators</span><span class="p">.</span><span class="nx">isDecoratorFactory</span><span class="p">())</span>
<span class="k">return</span><span class="p">;</span>
<span class="kd">const</span> <span class="nx">callExpression</span> <span class="o">=</span> <span class="nx">decorator</span><span class="p">.</span><span class="nx">getCallExpression</span><span class="p">()</span><span class="o">!</span><span class="p">.</span><span class="nx">getCompilerNode</span><span class="p">();</span>
<span class="k">for</span> <span class="p">(</span><span class="kd">const</span> <span class="nx">arg</span> <span class="nx">of</span> <span class="nx">callExpression</span><span class="p">.</span><span class="nx">arguments</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// use arg here</span>
<span class="p">}</span>
</code></pre>
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