mirror of
https://github.com/titanscouting/tra-analysis.git
synced 2024-11-15 07:36:18 +00:00
150 lines
8.9 KiB
HTML
150 lines
8.9 KiB
HTML
|
<!doctype html>
|
||
|
|
<html>
|
||
|
|
<title>npm-coding-style</title>
|
||
|
|
<meta charset="utf-8">
|
||
|
|
<link rel="stylesheet" type="text/css" href="../../static/style.css">
|
||
|
|
<link rel="canonical" href="https://www.npmjs.org/doc/misc/npm-coding-style.html">
|
||
|
|
<script async=true src="../../static/toc.js"></script>
|
||
|
|
|
||
|
|
<body>
|
||
|
|
<div id="wrapper">
|
||
|
|
|
||
|
|
<h1><a href="../misc/npm-coding-style.html">npm-coding-style</a></h1> <p>npm's "funny" coding style</p>
|
||
|
|
<h2 id="description">DESCRIPTION</h2>
|
||
|
|
<p>npm's coding style is a bit unconventional. It is not different for
|
||
|
|
difference's sake, but rather a carefully crafted style that is
|
||
|
|
designed to reduce visual clutter and make bugs more apparent.</p>
|
||
|
|
<p>If you want to contribute to npm (which is very encouraged), you should
|
||
|
|
make your code conform to npm's style.</p>
|
||
|
|
<p>Note: this concerns npm's code not the specific packages that you can download from the npm registry.</p>
|
||
|
|
<h2 id="line-length">Line Length</h2>
|
||
|
|
<p>Keep lines shorter than 80 characters. It's better for lines to be
|
||
|
|
too short than to be too long. Break up long lists, objects, and other
|
||
|
|
statements onto multiple lines.</p>
|
||
|
|
<h2 id="indentation">Indentation</h2>
|
||
|
|
<p>Two-spaces. Tabs are better, but they look like hell in web browsers
|
||
|
|
(and on GitHub), and node uses 2 spaces, so that's that.</p>
|
||
|
|
<p>Configure your editor appropriately.</p>
|
||
|
|
<h2 id="curly-braces">Curly braces</h2>
|
||
|
|
<p>Curly braces belong on the same line as the thing that necessitates them.</p>
|
||
|
|
<p>Bad:</p>
|
||
|
|
<pre><code>function ()
|
||
|
|
{</code></pre><p>Good:</p>
|
||
|
|
<pre><code>function () {</code></pre><p>If a block needs to wrap to the next line, use a curly brace. Don't
|
||
|
|
use it if it doesn't.</p>
|
||
|
|
<p>Bad:</p>
|
||
|
|
<pre><code>if (foo) { bar() }
|
||
|
|
while (foo)
|
||
|
|
bar()</code></pre><p>Good:</p>
|
||
|
|
<pre><code>if (foo) bar()
|
||
|
|
while (foo) {
|
||
|
|
bar()
|
||
|
|
}</code></pre><h2 id="semicolons">Semicolons</h2>
|
||
|
|
<p>Don't use them except in four situations:</p>
|
||
|
|
<ul>
|
||
|
|
<li><code>for (;;)</code> loops. They're actually required.</li>
|
||
|
|
<li>null loops like: <code>while (something) ;</code> (But you'd better have a good
|
||
|
|
reason for doing that.)</li>
|
||
|
|
<li><code>case 'foo': doSomething(); break</code></li>
|
||
|
|
<li>In front of a leading <code>(</code> or <code>[</code> at the start of the line.
|
||
|
|
This prevents the expression from being interpreted
|
||
|
|
as a function call or property access, respectively.</li>
|
||
|
|
</ul>
|
||
|
|
<p>Some examples of good semicolon usage:</p>
|
||
|
|
<pre><code>;(x || y).doSomething()
|
||
|
|
;[a, b, c].forEach(doSomething)
|
||
|
|
for (var i = 0; i < 10; i ++) {
|
||
|
|
switch (state) {
|
||
|
|
case 'begin': start(); continue
|
||
|
|
case 'end': finish(); break
|
||
|
|
default: throw new Error('unknown state')
|
||
|
|
}
|
||
|
|
end()
|
||
|
|
}</code></pre><p>Note that starting lines with <code>-</code> and <code>+</code> also should be prefixed
|
||
|
|
with a semicolon, but this is much less common.</p>
|
||
|
|
<h2 id="comma-first">Comma First</h2>
|
||
|
|
<p>If there is a list of things separated by commas, and it wraps
|
||
|
|
across multiple lines, put the comma at the start of the next
|
||
|
|
line, directly below the token that starts the list. Put the
|
||
|
|
final token in the list on a line by itself. For example:</p>
|
||
|
|
<pre><code>var magicWords = [ 'abracadabra'
|
||
|
|
, 'gesundheit'
|
||
|
|
, 'ventrilo'
|
||
|
|
]
|
||
|
|
, spells = { 'fireball' : function () { setOnFire() }
|
||
|
|
, 'water' : function () { putOut() }
|
||
|
|
}
|
||
|
|
, a = 1
|
||
|
|
, b = 'abc'
|
||
|
|
, etc
|
||
|
|
, somethingElse</code></pre><h2 id="quotes">Quotes</h2>
|
||
|
|
<p>Use single quotes for strings except to avoid escaping.</p>
|
||
|
|
<p>Bad:</p>
|
||
|
|
<pre><code>var notOk = "Just double quotes"</code></pre><p>Good:</p>
|
||
|
|
<pre><code>var ok = 'String contains "double" quotes'
|
||
|
|
var alsoOk = "String contains 'single' quotes or apostrophe"</code></pre><h2 id="whitespace">Whitespace</h2>
|
||
|
|
<p>Put a single space in front of <code>(</code> for anything other than a function call.
|
||
|
|
Also use a single space wherever it makes things more readable.</p>
|
||
|
|
<p>Don't leave trailing whitespace at the end of lines. Don't indent empty
|
||
|
|
lines. Don't use more spaces than are helpful.</p>
|
||
|
|
<h2 id="functions">Functions</h2>
|
||
|
|
<p>Use named functions. They make stack traces a lot easier to read.</p>
|
||
|
|
<h2 id="callbacks-sync-async-style">Callbacks, Sync/async Style</h2>
|
||
|
|
<p>Use the asynchronous/non-blocking versions of things as much as possible.
|
||
|
|
It might make more sense for npm to use the synchronous fs APIs, but this
|
||
|
|
way, the fs and http and child process stuff all uses the same callback-passing
|
||
|
|
methodology.</p>
|
||
|
|
<p>The callback should always be the last argument in the list. Its first
|
||
|
|
argument is the Error or null.</p>
|
||
|
|
<p>Be very careful never to ever ever throw anything. It's worse than useless.
|
||
|
|
Just send the error message back as the first argument to the callback.</p>
|
||
|
|
<h2 id="errors">Errors</h2>
|
||
|
|
<p>Always create a new Error object with your message. Don't just return a
|
||
|
|
string message to the callback. Stack traces are handy.</p>
|
||
|
|
<h2 id="logging">Logging</h2>
|
||
|
|
<p>Logging is done using the <a href="https://github.com/npm/npmlog">npmlog</a>
|
||
|
|
utility.</p>
|
||
|
|
<p>Please clean up logs when they are no longer helpful. In particular,
|
||
|
|
logging the same object over and over again is not helpful. Logs should
|
||
|
|
report what's happening so that it's easier to track down where a fault
|
||
|
|
occurs.</p>
|
||
|
|
<p>Use appropriate log levels. See <code><a href="../misc/npm-config.html">npm-config(7)</a></code> and search for
|
||
|
|
"loglevel".</p>
|
||
|
|
<h2 id="case-naming-etc-">Case, naming, etc.</h2>
|
||
|
|
<p>Use <code>lowerCamelCase</code> for multiword identifiers when they refer to objects,
|
||
|
|
functions, methods, properties, or anything not specified in this section.</p>
|
||
|
|
<p>Use <code>UpperCamelCase</code> for class names (things that you'd pass to "new").</p>
|
||
|
|
<p>Use <code>all-lower-hyphen-css-case</code> for multiword filenames and config keys.</p>
|
||
|
|
<p>Use named functions. They make stack traces easier to follow.</p>
|
||
|
|
<p>Use <code>CAPS_SNAKE_CASE</code> for constants, things that should never change
|
||
|
|
and are rarely used.</p>
|
||
|
|
<p>Use a single uppercase letter for function names where the function
|
||
|
|
would normally be anonymous, but needs to call itself recursively. It
|
||
|
|
makes it clear that it's a "throwaway" function.</p>
|
||
|
|
<h2 id="null-undefined-false-0">null, undefined, false, 0</h2>
|
||
|
|
<p>Boolean variables and functions should always be either <code>true</code> or
|
||
|
|
<code>false</code>. Don't set it to 0 unless it's supposed to be a number.</p>
|
||
|
|
<p>When something is intentionally missing or removed, set it to <code>null</code>.</p>
|
||
|
|
<p>Don't set things to <code>undefined</code>. Reserve that value to mean "not yet
|
||
|
|
set to anything."</p>
|
||
|
|
<p>Boolean objects are forbidden.</p>
|
||
|
|
<h2 id="see-also">SEE ALSO</h2>
|
||
|
|
<ul>
|
||
|
|
<li><a href="../misc/npm-developers.html">npm-developers(7)</a></li>
|
||
|
|
<li><a href="../cli/npm.html">npm(1)</a></li>
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<table border=0 cellspacing=0 cellpadding=0 id=npmlogo>
|
||
|
|
<tr><td style="width:180px;height:10px;background:rgb(237,127,127)" colspan=18> </td></tr>
|
||
|
|
<tr><td rowspan=4 style="width:10px;height:10px;background:rgb(237,127,127)"> </td><td style="width:40px;height:10px;background:#fff" colspan=4> </td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=4> </td><td style="width:40px;height:10px;background:#fff" colspan=4> </td><td rowspan=4 style="width:10px;height:10px;background:rgb(237,127,127)"> </td><td colspan=6 style="width:60px;height:10px;background:#fff"> </td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=4> </td></tr>
|
||
|
|
<tr><td colspan=2 style="width:20px;height:30px;background:#fff" rowspan=3> </td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=3> </td><td style="width:10px;height:10px;background:#fff" rowspan=3> </td><td style="width:20px;height:10px;background:#fff" rowspan=4 colspan=2> </td><td style="width:10px;height:20px;background:rgb(237,127,127)" rowspan=2> </td><td style="width:10px;height:10px;background:#fff" rowspan=3> </td><td style="width:20px;height:10px;background:#fff" rowspan=3 colspan=2> </td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=3> </td><td style="width:10px;height:10px;background:#fff" rowspan=3> </td><td style="width:10px;height:10px;background:rgb(237,127,127)" rowspan=3> </td></tr>
|
||
|
|
<tr><td style="width:10px;height:10px;background:#fff" rowspan=2> </td></tr>
|
||
|
|
<tr><td style="width:10px;height:10px;background:#fff"> </td></tr>
|
||
|
|
<tr><td style="width:60px;height:10px;background:rgb(237,127,127)" colspan=6> </td><td colspan=10 style="width:10px;height:10px;background:rgb(237,127,127)"> </td></tr>
|
||
|
|
<tr><td colspan=5 style="width:50px;height:10px;background:#fff"> </td><td style="width:40px;height:10px;background:rgb(237,127,127)" colspan=4> </td><td style="width:90px;height:10px;background:#fff" colspan=9> </td></tr>
|
||
|
|
</table>
|
||
|
|
<p id="footer">npm-coding-style — npm@6.5.0</p>
|
||
|
|
|