function transform (code) {
    var ast = acorn.parse(code, { sourceType: 'module' });
    return escodegen.generate(unassert(ast));
}

<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">function</span> <span class="token function">transform</span><span class="token punctuation">(</span><span class="token parameter">code<span class="token operator">:</span> any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span></code></pre>

let acorn = require("acorn");
console.log(acorn.parse("1 + 1", {ecmaVersion: 2020}));
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">namespace</span> acorn
<span class="token keyword">import</span> acorn</code></pre>

function rename(code, tokenTo, tokenFrom) {

  

  //...
try {
    ast = acorn.parse(code, {
      ecmaVersion: 11,
      ranges: true,
      allowReturnOutsideFunction: true
    });
  } catch(err) {
    // this should probably log something and/or exit violently
    return code;
  }

  

  //...
}

<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">function</span> <span class="token function">rename</span><span class="token punctuation">(</span><span class="token parameter">code<span class="token operator">:</span> any<span class="token punctuation">,</span> tokenTo<span class="token operator">:</span> any<span class="token punctuation">,</span> tokenFrom<span class="token operator">:</span> any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span></code></pre>

module.exports = function(options) {
  
  //...
return {
    transform: function(code, id) {
      
      //...
var ast, magic = new MagicString(code), modified;

      try {
        ast = acorn.parse(code, {ecmaVersion: 6, sourceType: "module"});
      } catch (error) {
        error.message += " in " + id;
        throw error;
      }

      

      //...
}
  };
}
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">module</span> <span class="token keyword">export</span><span class="token operator">=</span>
<span class="token punctuation">(</span>property<span class="token punctuation">)</span> <span class="token keyword">export</span><span class="token operator">=</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token parameter">options<span class="token operator">:</span> any</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
    <span class="token function-variable function">transform</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token parameter">code<span class="token operator">:</span> any<span class="token punctuation">,</span> id<span class="token operator">:</span> any</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token keyword">undefined</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span></code></pre>

var acorn = require("acorn");
var jsx = require("acorn-jsx");
var JSXParser = acorn.Parser.extend(jsx());
JSXParser.parse("foo(<bar/>)", {ecmaVersion: 2020});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">namespace</span> acorn
<span class="token keyword">import</span> acorn</code></pre>

var acorn = require("acorn");
var jsx = require("acorn-jsx");
var JSXParser = acorn.Parser.extend(jsx());
JSXParser.parse("foo(<bar/>)", {ecmaVersion: 2020});
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token punctuation">(</span>alias<span class="token punctuation">)</span> <span class="token keyword">namespace</span> acorn
<span class="token keyword">import</span> acorn</code></pre>

for (let token of acorn.tokenizer(str)) {
  // iterate over the tokens
}

// transform code to array of tokens:
var tokens = [...acorn.tokenizer(str)];
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">let</span> token<span class="token operator">:</span> <span class="token builtin">any</span></code></pre>

function ReactHotExportLoader(source) {
  
  //...
if (!source || isProductionEnv() || shouldSkip()) {
    return source;
  }

  const ast = parse(source, {
    sourceType: 'module',
    plugins: ['jsx', ...plugins],
  });


  let importReactLibrary = false;
  let exportReactComponent = false;
  
  //...
}

<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">function</span> <span class="token function">ReactHotExportLoader</span><span class="token punctuation">(</span><span class="token parameter">source<span class="token operator">:</span> any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span></code></pre>

function transform(code, componentName) {
  const ast = parser.parse(code, {
    sourceType: 'module',
    plugins: [['decorators-legacy', { decoratorsBeforeExport: false }]],
  });

  let umlData = '';

  let memberDefs = [];
  let serviceDefs = [];
  let extendDefs = [];
  let className = '';
  
  //...
}

<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">function</span> <span class="token function">transform</span><span class="token punctuation">(</span><span class="token parameter">code<span class="token operator">:</span> any<span class="token punctuation">,</span> componentName<span class="token operator">:</span> any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">string</span></code></pre>

const check = function (code, options) {
  
  //...
type = type.toUpperCase();
  const ast = parser.parse(code, {
    plugins: ['flow', 'dynamicImport'],
    sourceType: 'module'
  });
  let tokenList = [];

  

  //...
}


<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">const</span> <span class="token function-variable function">check</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token parameter">code<span class="token operator">:</span> any<span class="token punctuation">,</span> options<span class="token operator">:</span> any</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token builtin">any</span><span class="token punctuation">[</span><span class="token punctuation">]</span></code></pre>

function generateCode(definition, options) {
  
  //...
const ast = parse(source, {
    sourceType: 'module',
    plugins: ['typescript'],
  });

  

  //...
}


<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">function</span> <span class="token function">generateCode</span><span class="token punctuation">(</span><span class="token parameter">definition<span class="token operator">:</span> object<span class="token punctuation">,</span> options<span class="token operator">:</span> object</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">string</span></code><div class="typing-tooltip-markup">Generate codes<br><br><em>@param</em> <code>definition</code><br><br><em>@param</em> <code>options</code></div></pre>

//...
let ast = parse(jscode);



//...
<pre class="typing-tooltip"><code data-language="javascript" class="language-javascript"><span class="token keyword">let</span> ast<span class="token operator">:</span> ParseResult<span class="token operator">&lt;</span>t<span class="token punctuation">.</span>File<span class="token operator">></span></code></pre>