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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang xml:lang>
<head>
<meta charset="utf-8" />
<meta name="generator" content="pandoc" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
<title>-</title>
<style>
code{white-space: pre-wrap;}
span.smallcaps{font-variant: small-caps;}
div.columns{display: flex; gap: min(4vw, 1.5em);}
div.column{flex: auto; overflow-x: auto;}
div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
ul.task-list[class]{list-style: none;}
ul.task-list li input[type="checkbox"] {
font-size: inherit;
width: 0.8em;
margin: 0 0.8em 0.2em -1.6em;
vertical-align: middle;
}
.display.math{display: block; text-align: center; margin: 0.5rem auto;}
</style>
<style type="text/css">
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margin: 0;
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font-family: Helvetica, arial, freesans, clean, sans-serif;
font-size: 14px;
line-height: 1.6;
color: #333;
background-color: #fff;
padding: 20px;
max-width: 960px;
margin: 0 auto;
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margin-top: 0 !important;
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margin-bottom: 0 !important;
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</head>
<body>
<h1 id="anti-babel">anti-babel</h1>
<h2 id="tldr">TL;DR;</h2>
<p>Refactorings from proptietary libraries code to ES5, ES6
constructions.</p>
<p>See also more general project called <a href="https://github.com/mohebifar/lebab">lebab</a></p>
<p>NOTE: The code of scripts DOES NOT cover all possible scenarios, some
usages of api may not me matched, or we just do not want to automate
their usage (working on safest possible scenarios, but sometimes it is
better to convert border cases by humans). You are always welcomed to
CONTRIBUTE another variants.</p>
<p>Currently available refactoring scripts:</p>
<ul>
<li>all</li>
<li>dojo/array.indexOf</li>
<li>dojo/array.map</li>
<li>dojo/df.keys</li>
<li>dojo/dstring.trim</li>
<li>dojo/hitch2bind</li>
<li>dojo/lang.isArray</li>
<li>dojo/lang.isFunction</li>
<li>dojo/partial2bind</li>
<li>js/for2map</li>
<li>js/object.keys</li>
<li>js/substring.length</li>
<li>js/substring.tail</li>
<li>lodash/array.forEach</li>
<li>node/mkdirp.sync</li>
</ul>
<p>Install external tools:</p>
<pre><code>npm install -g grasp #yes for now as global, sorry</code></pre>
<p>Apply refactoring (on sample files)</p>
<pre><code>< samples/hitch2bind/hitch2bind.before.js src/dojo/hitch2bind.v01 # NOTE: should apply all versions step by step</code></pre>
<p>Check what is changed and if behaves same (naive samples for
now):</p>
<pre><code># before: print source and results
< samples/lodash/array.forEach.js tee /dev/fd/2 | node
# after: print source and results
< samples/lodash/array.forEach.js ./src/lodash/array.forEach.v02 | tee /dev/fd/2 | node
# for dojo samples use dnode
< samples/dojo/dstring.trim.js src/dojo/dstring.trim.v01 | tee x.js; dnode x.js; rm x.js</code></pre>
<p>Run on your project:</p>
<pre><code># set anti-babel root to path
AB=$PWD
# cd to your project/js folder
# run all or one of
$AB/src/dojo/array.indexOf.v01 -i -r .
$AB/src/dojo/array.map.v01 -i -r .
$AB/src/dojo/array.map.v02 -i -r .
$AB/src/dojo/df.keys.v01 -i -r .
$AB/src/dojo/dstring.trim.v01 -i -r .
$AB/src/dojo/dstring.trim.v02 -i -r .
$AB/src/dojo/hitch2bind.v01 -i -r .
$AB/src/dojo/hitch2bind.v02 -i -r .
$AB/src/dojo/hitch2bind.v03 -i -r .
$AB/src/dojo/hitch2bind.v04 -i -r .
$AB/src/dojo/lang.isArray.v01 -i -r .
$AB/src/dojo/lang.isFunction.v01 -i -r .
$AB/src/dojo/partial2bind.v01 -i -r .
$AB/src/js/for2map.v01 -i -r .
$AB/src/js/for2map.v02 -i -r .
$AB/src/js/for2map.v03 -i -r .
$AB/src/js/object.keys.v01 -i -r .
$AB/src/js/substring.length -i -r .
$AB/src/js/substring.tail -i -r .
$AB/src/lodash/array.forEach.v00 -i -r .
$AB/src/lodash/array.forEach.v01 -i -r .
$AB/src/lodash/array.forEach.v02 -i -r .
$AB/src/lodash/array.forEach.v03 -i -r .
$AB/src/node/mkdirp.sync.v00 -i -r .
# review
git diff
# test</code></pre>
<p>Study <a href="http://www.graspjs.com/">grasp.js</a> for CLI
parameters (we pass all to underlying grasp now)</p>
<h2 id="details">Details</h2>
<p>There are <a href="https://github.com/addyosmani/es6-tools">plenty of
projects</a> to translate es6 syntax to older syntaxes. This allows you
to write modern syntax and run on ‘old machines’.</p>
<p>This project is opposite.</p>
<p>Helping you to CONVERT OLD CODE BASE TO NEW API AND SYNTAX. (hence
anti- in the name and <a href="https://babeljs.io">babel</a> as one of
‘them’.)</p>
<h2 id="background">Background</h2>
<p>We are writing JavaScript from ‘dark ages’ (somewhere 19XX), and we
are running big projects, this means we have to maintain them, for ages
sometimes.</p>
<p>This could help to modernize them into something more readable
today.</p>
<p>Today we are developing in dojo, so many samples may involve ‘old
dojo’ APIs and refactoring to ES5,6 APIs, but the idea can be taken to
other codes as well.</p>
<p>To see if you can/should refactor you can use <a href="https://kangax.github.io/compat-table/es6/">compat-tables as
UI</a> or <a href="https://github.com/gratex/compat-table">out
CLI</a></p>
<h2 id="dojo">dojo</h2>
<p>We are developing in dojo. Dojo contains a lot of good ideas, but a
lot of APIs is not needed anymore.</p>
<p>For Example</p>
<p><a href="https://dojotoolkit.org/reference-guide/1.7/dojo/string/trim.html">dojo/string/trim</a>
vs. <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim">String.prototype.trim</a></p>
<h1 id="unlearn-dojo-learn-es56">‘Unlearn dojo’, learn es5,6</h1>
<p>es5 features mapped to dojo apis. This is only approx mapping and for
caveats you must learn both APIs, to understand if you can(not)
refactor:</p>
<p>ES5 features mapped to dojo API, all of these except strict mode are
supported in IE9.</p>
<table>
<thead>
<tr class="header">
<th>es</th>
<th>dojo</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Object.create</td>
<td>-</td>
</tr>
<tr class="even">
<td>Object.defineProperty</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Object.defineProperties</td>
<td>-</td>
</tr>
<tr class="even">
<td>Object.getPrototypeOf</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Object.keys</td>
<td>df.keys</td>
</tr>
<tr class="even">
<td>Object.seal</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Object.freeze</td>
<td>-</td>
</tr>
<tr class="even">
<td>Object.preventExtensions</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Object.isSealed</td>
<td>-</td>
</tr>
<tr class="even">
<td>Object.isFrozen</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Object.isExtensible</td>
<td>-</td>
</tr>
<tr class="even">
<td>Object.getOwnPropertyDescriptor</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Object.getOwnPropertyNames</td>
<td>-</td>
</tr>
<tr class="even">
<td>Date.prototype.toISOString</td>
<td>date/stamp.toISOString</td>
</tr>
<tr class="odd">
<td>Date.now</td>
<td>-</td>
</tr>
<tr class="even">
<td>Array.isArray</td>
<td>_base/lang.isArray</td>
</tr>
<tr class="odd">
<td>JSON</td>
<td>json</td>
</tr>
<tr class="even">
<td>Function.prototype.bind</td>
<td>_base/lang.hitch, _base/lang.partial</td>
</tr>
<tr class="odd">
<td>String.prototype.trim</td>
<td>_base/lang.trim</td>
</tr>
<tr class="even">
<td>Array.prototype.indexOf</td>
<td>_base/array.indexOf</td>
</tr>
<tr class="odd">
<td>Array.prototype.lastIndexOf</td>
<td>_base/array.lastIndexOf</td>
</tr>
<tr class="even">
<td>Array.prototype.every</td>
<td>_base/array.every</td>
</tr>
<tr class="odd">
<td>Array.prototype.some</td>
<td>_base/array.some</td>
</tr>
<tr class="even">
<td>Array.prototype.forEach</td>
<td>_base/array.forEach</td>
</tr>
<tr class="odd">
<td>Array.prototype.map</td>
<td>_base/array.map</td>
</tr>
<tr class="even">
<td>Array.prototype.filter</td>
<td>_base/array.filter</td>
</tr>
<tr class="odd">
<td>Array.prototype.reduce</td>
<td>lang/functional/reduce</td>
</tr>
<tr class="even">
<td>Array.prototype.reduceRight</td>
<td>lang/functional/reduceRight</td>
</tr>
<tr class="odd">
<td>Getter in property initializer</td>
<td>-</td>
</tr>
<tr class="even">
<td>Setter in property initializer</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Property access on strings</td>
<td>-</td>
</tr>
<tr class="even">
<td>Reserved words as property names</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Zero-width chars in identifiers</td>
<td>-</td>
</tr>
<tr class="even">
<td>parseInt() ignores leading zeros</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Immutable undefined</td>
<td>-</td>
</tr>
<tr class="even">
<td>Strict mode</td>
<td>-</td>
</tr>
</tbody>
</table>
<p>Note: es5,6 features derived from compat-tables</p>
<pre><code>node ../compat-table/cli.js es6 tests | jsontool -a name > es5.txt
node ../compat-table/cli.js es6 tests | jsontool -a name > es6.txt
node ../compat-table/cli.js es7 tests | jsontool -a name > es7.txt</code></pre>
<p>ES6 features (TODO: mapping)</p>
<table>
<colgroup>
<col style="width: 37%" />
<col style="width: 62%" />
</colgroup>
<thead>
<tr class="header">
<th>es</th>
<th>dojo</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>proper tail calls (tail call optimisation) - direct recursion</td>
<td>-</td>
</tr>
<tr class="even">
<td>proper tail calls (tail call optimisation) - mutual recursion</td>
<td>-</td>
</tr>
<tr class="odd">
<td>default function parameters - basic functionality</td>
<td>-</td>
</tr>
<tr class="even">
<td>default function parameters - explicit undefined defers to the
default</td>
<td>-</td>
</tr>
<tr class="odd">
<td>default function parameters - defaults can refer to previous
params</td>
<td>-</td>
</tr>
<tr class="even">
<td>default function parameters - arguments object interaction</td>
<td>-</td>
</tr>
<tr class="odd">
<td>default function parameters - temporal dead zone</td>
<td>-</td>
</tr>
<tr class="even">
<td>default function parameters - separate scope</td>
<td>-</td>
</tr>
<tr class="odd">
<td>default function parameters - new Function() support</td>
<td>-</td>
</tr>
<tr class="even">
<td>rest parameters - basic functionality</td>
<td>-</td>
</tr>
<tr class="odd">
<td>rest parameters - function ‘length’ property</td>
<td>-</td>
</tr>
<tr class="even">
<td>rest parameters - arguments object interaction</td>
<td>-</td>
</tr>
<tr class="odd">
<td>rest parameters - can’t be used in setters</td>
<td>-</td>
</tr>
<tr class="even">
<td>rest parameters - new Function() support</td>
<td>-</td>
</tr>
<tr class="odd">
<td>spread (…) operator - with arrays, in function calls</td>
<td>-</td>
</tr>
<tr class="even">
<td>spread (…) operator - with arrays, in array literals</td>
<td>-</td>
</tr>
<tr class="odd">
<td>spread (…) operator - with sparse arrays, in function calls</td>
<td>-</td>
</tr>
<tr class="even">
<td>spread (…) operator - with sparse arrays, in array literals</td>
<td>-</td>
</tr>
<tr class="odd">
<td>spread (…) operator - with strings, in function calls</td>
<td>-</td>
</tr>
<tr class="even">
<td>spread (…) operator - with strings, in array literals</td>
<td>-</td>
</tr>
<tr class="odd">
<td>spread (…) operator - with astral plane strings, in function
calls</td>
<td>-</td>
</tr>
<tr class="even">
<td>spread (…) operator - with astral plane strings, in array
literals</td>
<td>-</td>
</tr>
<tr class="odd">
<td>spread (…) operator - with generator instances, in calls</td>
<td>-</td>
</tr>
<tr class="even">
<td>spread (…) operator - with generator instances, in arrays</td>
<td>-</td>
</tr>
<tr class="odd">
<td>spread (…) operator - with generic iterables, in calls</td>
<td>-</td>
</tr>
<tr class="even">
<td>spread (…) operator - with generic iterables, in arrays</td>
<td>-</td>
</tr>
<tr class="odd">
<td>spread (…) operator - with instances of iterables, in calls</td>
<td>-</td>
</tr>
<tr class="even">
<td>spread (…) operator - with instances of iterables, in arrays</td>
<td>-</td>
</tr>
<tr class="odd">
<td>spread (…) operator - spreading non-iterables is a runtime
error</td>
<td>-</td>
</tr>
<tr class="even">
<td>object literal extensions - computed properties</td>
<td>-</td>
</tr>
<tr class="odd">
<td>object literal extensions - shorthand properties</td>
<td>-</td>
</tr>
<tr class="even">
<td>object literal extensions - shorthand methods</td>
<td>-</td>
</tr>
<tr class="odd">
<td>object literal extensions - string-keyed shorthand methods</td>
<td>-</td>
</tr>
<tr class="even">
<td>object literal extensions - computed shorthand methods</td>
<td>-</td>
</tr>
<tr class="odd">
<td>object literal extensions - computed accessors</td>
<td>-</td>
</tr>
<tr class="even">
<td>for..of loops - with arrays</td>
<td>-</td>
</tr>
<tr class="odd">
<td>for..of loops - with sparse arrays</td>
<td>-</td>
</tr>
<tr class="even">
<td>for..of loops - with strings</td>
<td>-</td>
</tr>
<tr class="odd">
<td>for..of loops - with astral plane strings</td>
<td>-</td>
</tr>
<tr class="even">
<td>for..of loops - with generator instances</td>
<td>-</td>
</tr>
<tr class="odd">
<td>for..of loops - with generic iterables</td>
<td>-</td>
</tr>
<tr class="even">
<td>for..of loops - with instances of generic iterables</td>
<td>-</td>
</tr>
<tr class="odd">
<td>for..of loops - iterator closing, break</td>
<td>-</td>
</tr>
<tr class="even">
<td>for..of loops - iterator closing, throw</td>
<td>-</td>
</tr>
<tr class="odd">
<td>octal and binary literals - octal literals</td>
<td>-</td>
</tr>
<tr class="even">
<td>octal and binary literals - binary literals</td>
<td>-</td>
</tr>
<tr class="odd">
<td>octal and binary literals - octal supported by Number()</td>
<td>-</td>
</tr>
<tr class="even">
<td>octal and binary literals - binary supported by Number()</td>
<td>-</td>
</tr>
<tr class="odd">
<td>template strings - basic functionality</td>
<td>-</td>
</tr>
<tr class="even">
<td>template strings - toString conversion</td>
<td>-</td>
</tr>
<tr class="odd">
<td>template strings - tagged template strings</td>
<td>-</td>
</tr>
<tr class="even">
<td>template strings - passed array is frozen</td>
<td>-</td>
</tr>
<tr class="odd">
<td>template strings - line break normalisation</td>
<td>-</td>
</tr>
<tr class="even">
<td>RegExp “y” and “u” flags - “y” flag</td>
<td>-</td>
</tr>
<tr class="odd">
<td>RegExp “y” and “u” flags - “y” flag, lastIndex</td>
<td>-</td>
</tr>
<tr class="even">
<td>RegExp “y” and “u” flags - “u” flag</td>
<td>-</td>
</tr>
<tr class="odd">
<td>RegExp “y” and “u” flags - “u” flag, Unicode code point escapes</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - with arrays</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - with sparse arrays</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - with strings</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - with astral plane strings</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - with generator instances</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - with generic iterables</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - with instances of generic iterables</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - iterator closing</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - iterable destructuring expression</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - chained iterable destructuring</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - trailing commas in iterable patterns</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - with objects</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - object destructuring with primitives</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - trailing commas in object patterns</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - object destructuring expression</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - parenthesised left-hand-side is a syntax error</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - chained object destructuring</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - throws on null and undefined</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - computed properties</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - multiples in a single var statement</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - nested</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - in parameters</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - in parameters, ‘arguments’ interaction</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - in parameters, new Function() support</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - in parameters, function ‘length’ property</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - in for-in loop heads</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - in for-of loop heads</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - rest</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - nested rest</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - empty patterns</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - empty patterns in parameters</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - defaults</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - defaults in parameters</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - defaults, let temporal dead zone</td>
<td>-</td>
</tr>
<tr class="even">
<td>destructuring - defaults in parameters, separate scope</td>
<td>-</td>
</tr>
<tr class="odd">
<td>destructuring - defaults in parameters, new Function() support</td>
<td>-</td>
</tr>
<tr class="even">
<td>Unicode code point escapes - in strings</td>
<td>-</td>
</tr>
<tr class="odd">
<td>Unicode code point escapes - in identifiers</td>
<td>-</td>
</tr>
<tr class="even">
<td>new.target - in constructors</td>
<td>-</td>
</tr>
<tr class="odd">
<td>new.target - assignment is an early error</td>
<td>-</td>
</tr>
<tr class="even">
<td>const - basic support</td>
<td>-</td>
</tr>
<tr class="odd">
<td>const - is block-scoped</td>
<td>-</td>
</tr>
<tr class="even">
<td>const - redefining a const is an error</td>
<td>-</td>
</tr>
<tr class="odd">
<td>const - temporal dead zone</td>
<td>-</td>
</tr>
<tr class="even">
<td>const - basic support (strict mode)</td>
<td>-</td>
</tr>
<tr class="odd">
<td>const - is block-scoped (strict mode)</td>
<td>-</td>
</tr>
<tr class="even">
<td>const - redefining a const (strict mode)</td>
<td>-</td>
</tr>
<tr class="odd">
<td>const - temporal dead zone (strict mode)</td>
<td>-</td>
</tr>
<tr class="even">
<td>let - basic support</td>
<td>-</td>
</tr>
<tr class="odd">
<td>let - is block-scoped</td>
<td>-</td>
</tr>
<tr class="even">
<td>let - for-loop statement scope</td>
<td>-</td>
</tr>
<tr class="odd">
<td>let - temporal dead zone</td>
<td>-</td>
</tr>
<tr class="even">
<td>let - for-loop iteration scope</td>
<td>-</td>
</tr>
<tr class="odd">
<td>let - basic support (strict mode)</td>
<td>-</td>
</tr>
<tr class="even">
<td>let - is block-scoped (strict mode)</td>
<td>-</td>
</tr>
<tr class="odd">
<td>let - for-loop statement scope (strict mode)</td>
<td>-</td>
</tr>
<tr class="even">
<td>let - temporal dead zone (strict mode)</td>
<td>-</td>
</tr>
<tr class="odd">
<td>let - for-loop iteration scope (strict mode)</td>
<td>-</td>
</tr>
<tr class="even">
<td>block-level function declaration</td>
<td>-</td>
</tr>
<tr class="odd">
<td>arrow functions - 0 parameters</td>
<td>-</td>
</tr>
<tr class="even">
<td>arrow functions - 1 parameter, no brackets</td>
<td>-</td>
</tr>
<tr class="odd">