chained_evaluation_1: {
    options = {
        collapse_vars: true,
        evaluate: true,
        reduce_funcs: true,
        reduce_vars: true,
        unused: true,
    }
    input: {
        (function() {
            var a = 1;
            (function() {
                var b = a, c;
                c = f(b);
                c.bar = b;
            })();
        })();
    }
    expect: {
        (function() {
            (function() {
                f(1).bar = 1;
            })();
        })();
    }
}

chained_evaluation_2: {
    options = {
        collapse_vars: true,
        evaluate: true,
        reduce_funcs: true,
        reduce_vars: true,
        unused: true,
    }
    input: {
        (function() {
            var a = "long piece of string";
            (function() {
                var b = a, c;
                c = f(b);
                c.bar = b;
            })();
        })();
    }
    expect: {
        (function() {
            (function() {
                var b = "long piece of string";
                f(b).bar = b;
            })();
        })();
    }
}
the flow of data in JS program, based on UglifyJS</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/tracifyjs/about/'>about</a><a href='/tracifyjs/'>summary</a><a href='/tracifyjs/refs/?id=bfe3a8b5161457062224959bbb9938c106503f97'>refs</a><a href='/tracifyjs/log/lib/scope.js'>log</a><a href='/tracifyjs/tree/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>tree</a><a class='active' href='/tracifyjs/commit/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>commit</a><a href='/tracifyjs/diff/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>diff</a></td><td class='form'><form class='right' method='get' action='/tracifyjs/log/lib/scope.js'>
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<option value='grep'>log msg</option>
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<option value='range'>range</option>
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<div class='path'>path: <a href='/tracifyjs/commit/?id=bfe3a8b5161457062224959bbb9938c106503f97'>root</a>/<a href='/tracifyjs/commit/lib?id=bfe3a8b5161457062224959bbb9938c106503f97'>lib</a>/<a href='/tracifyjs/commit/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>scope.js</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='bfe3a8b5161457062224959bbb9938c106503f97'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Alex Lam S.L &lt;alexlamsl@gmail.com&gt;</td><td class='right'>2021-02-21 02:00:34 +0000</td></tr>
<tr><th>committer</th><td>GitHub &lt;noreply@github.com&gt;</td><td class='right'>2021-02-21 10:00:34 +0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/tracifyjs/commit/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>bfe3a8b5161457062224959bbb9938c106503f97</a> (<a href='/tracifyjs/patch/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/tracifyjs/tree/?id=bfe3a8b5161457062224959bbb9938c106503f97'>e8d190a5e06daba29ee5c398d7e5861974b165ee</a> /<a href='/tracifyjs/tree/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>lib/scope.js</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/tracifyjs/commit/lib/scope.js?id=ae09773ba017ce65b261d15ed3098ae40c3b2a1b'>ae09773ba017ce65b261d15ed3098ae40c3b2a1b</a> (<a href='/tracifyjs/diff/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97&amp;id2=ae09773ba017ce65b261d15ed3098ae40c3b2a1b'>diff</a>)</td></tr><tr><th>download</th><td colspan='2' class='oid'><a href='/tracifyjs/snapshot/tracifyjs-bfe3a8b5161457062224959bbb9938c106503f97.tar.gz'>tracifyjs-bfe3a8b5161457062224959bbb9938c106503f97.tar.gz</a><br/><a href='/tracifyjs/snapshot/tracifyjs-bfe3a8b5161457062224959bbb9938c106503f97.zip'>tracifyjs-bfe3a8b5161457062224959bbb9938c106503f97.zip</a><br/></td></tr></table>
<div class='commit-subject'>fix corner case with `import` (#4672)</div><div class='commit-msg'></div><div class='diffstat-header'><a href='/tracifyjs/diff/?id=bfe3a8b5161457062224959bbb9938c106503f97'>Diffstat</a> (limited to 'lib/scope.js')</div><table summary='diffstat' class='diffstat'><tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/tracifyjs/diff/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>lib/scope.js</a></td><td class='right'>2</td><td class='graph'><table summary='file diffstat' width='2%'><tr><td class='add' style='width: 50.0%;'/><td class='rem' style='width: 50.0%;'/><td class='none' style='width: 0.0%;'/></tr></table></td></tr>
</table><div class='diffstat-summary'>1 files changed, 1 insertions, 1 deletions</div><table summary='diff' class='diff'><tr><td><div class='head'>diff --git a/lib/scope.js b/lib/scope.js<br/>index f638890f..97027274 100644<br/>--- a/<a href='/tracifyjs/tree/lib/scope.js?id=ae09773ba017ce65b261d15ed3098ae40c3b2a1b'>lib/scope.js</a><br/>+++ b/<a href='/tracifyjs/tree/lib/scope.js?id=bfe3a8b5161457062224959bbb9938c106503f97'>lib/scope.js</a></div><div class='hunk'>@@ -197,7 +197,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {</div><div class='ctx'>         } else if (node instanceof AST_SymbolLet) {</div><div class='ctx'>             scope.def_variable(node).exported = exported;</div><div class='ctx'>         } else if (node instanceof AST_SymbolVar) {</div><div class='del'>-            defun.def_variable(node, null).exported = exported;</div><div class='add'>+            defun.def_variable(node, node instanceof AST_SymbolImport ? undefined : null).exported = exported;</div><div class='ctx'>             entangle(defun, scope);</div><div class='ctx'>         }</div><div class='ctx'> </div></td></tr></table></div> <!-- class=content -->
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