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const t  = require('babel-types');
const assert = require('assert');

/**
 * Is `module.exports` expression
 */
const isModuleExportsMemberExpression = (node) => {
  t.assertMemberExpression(node);
  t.assertIdentifier(node.object);
  assert.equal(node.object.name, 'module');

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Learning JavaScript and React

A guide for experienced programmers learning JavaScript and React.

JavaScript

Books & Reading

• [Effective JavaScript][effectivejs] covers advanced JavaScript topics, such as concurrency and library design, in great detail.

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Running Node Modules in React Native

How to use packages that depend on Node.js core modules in React Native.

See the [node-libs-react-native][node-libs-react-native] library as a convenience for implementing this method.

Node.js Core Modules

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Fonts in React Native

Default Fonts

A number of fonts are available by default based on the platform (e.g., Roboto on Android, Helvetica on iOS). See the full list here.

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const glob = require('glob');
const fs = require('fs');
const path = require('path');

const ROOT_PATH = path.resolve(`${__dirname}/..`);

// Get paths to all readable-stream packages in the dependency tree
function getPackagePaths(rootPath, packageName) {
  return glob.sync(`${rootPath}/**/node_modules/${packageName}`);
}

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Babel 5 will incorrectly allow a let declration shadow an outter var declaration. See below and note the user of var _filters on line 7 by Babel 6 instead of var filters by Babel 5 (which shadows the var filters declared on line 2).

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# Determines how many cpus the virtual machine should be given. Uses half of
# what's available on the host with a default of 4.
def numvcpus
  begin
    os_cpu_cores / 2
  rescue
    4
  end
end

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mdn Chrome Search Shortcut

Shortcut to perform a Google I'm Feeling Lucky search on https://developer.mozilla.org.

1. Settings: Manage search engines...

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diff --git a/data/stops.txt b/data/stops.txt
index 4e9c24e..200a82d 100644
--- a/data/stops.txt
+++ b/data/stops.txt
@@ -1,96 +1,68 @@
-stop_id,stop_code,stop_name,stop_desc,stop_lat,stop_lon,zone_id,stop_url,location_type,parent_station,platform_code
-70011,70011,"San Francisco Caltrain",,  37.776390,-122.394992,1,,0,ctsf,NB
-70012,70012,"San Francisco Caltrain",,  37.776348,-122.394935,1,,0,ctsf,SB
-70021,70021,"22nd St Caltrain",,  37.757599,-122.391880,1,,0,ct22,NB
-70022,70022,"22nd St Caltrain",,  37.757583,-122.392404,1,,0,ct22,SB

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I'm seeing this crash happen in a node http service running the newrelic agent. It seems to happen in this context:

1. An http request causes an unrecoverable error (unrelated to newrelic)
2. req.end() and req.destroy() are called on the request that caused the error
3. server.close() is called on the http server
4. The newrelic agent throws the above error

I am using node v4.2.3 and newrelic agent 1.24.0.