ariaminaei/pretty-error

See node.js errors with less clutter

pretty-error's Issues

Question: How do I format parsed error?

I create a module called evalmd that evaluates markdown files. Ideally I'd only want to show the trace of the markdown file. I don't expect this to be a feature of pretty-error, but I'd like to skip stack trace lines by extension. How after I edit a trace could I assemble the error again? I can't seem to overwrite the parsedError.trace variable and throw parsedError. @AriaMinaei thoughts?

var ParsedError = require('pretty-error/lib/parsed-error')
var _ = require('lodash')
var parsedError = new ParsedError(err)
var newTrace = _.filter(parsedError.trace, function (line) {
  var validExt = ['.md', '.markdown']
  var lineExt = path.extname(line.file)
  var isMarkdown = _.contains(validExt, lineExt)
  return isMarkdown
})

I'm I stuck having to stitch all the pieces together by hand? Or does pretty-error have a way to do this?

Ideally I could:

1. set the value of properties parsedError.setTrace(trace)
2. convert parsedError back to a error parsedError.toError()

Expose Error Parser / standalone usage of filter

I want to use the error parser because I want to show the code frame. To skip packages which are filtered too It were nice there would be a way to use the applied filters on an own parsed error.

doesn't work on windows

a little test (win10, node 6.9.1) shows:

C:\l\Neuer Ordner\node_modules\license-compatibility-checker\index.js:12
f
^

  �[0m�[97m�[41mReferenceError�[0m�[90m:�[0m�[37m �[0m�[97mf is not defined�[0m
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�[0m  �[0m  �[0m�[90m[Neuer Ordner]/[license-compatibility-checker]/index.js:12:1�[0m
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Default wrapping

Love the work you are doing! Thanks a ton for this module. My only wish is that by default it wouldn't hardwrap lines. Feels that this should be an opt-in, and I don't see an easy way of disabling it either.

What do you think?

Question: Associate with console.log out of the box

I want to integrate the library with my error library Errorifier. Basically in my library I create a Error Object, I add a little logic and return the logic. Something like:

constructor: ->
  err = new Error()
  # adding logic
  err

Externally is used like:

err = new Errorifier()
console.log err # normal output

The point is: I want to integrate with the library to, when you use console.log, see the outputted generate by the method .render, like:

err = new Errorifier()
console.log err # pretty output!

I didn't find a way to do it and still return the err object in my library constructor.

Do you think that this is possible? If is necessary, I can extends PrettyError.

PrettyError reneder adds extra \n

Is there a way to prevent the render from adding a \n?

Question: How can I replace the fullPath to the app directory by an alias

Hi,

I just discovered your module, which is really nice for mental sanity when looking at errors! Thank you.

I see that for node modules paths (dependencies), by default, the full path to the app root directory has an alias. Something like "[name-of-the-app]"

But this is not the case for the app code itself. How can we do the same for any path?

Document .stop() / a way to obtain unmodified stack traces

I had an issue where I needed to obtain an un-modified stack trace for another package to parse information out of. In the end I solved it as:

pe.stop();
const stack = (new Error()).stack;
pe.start();

It took some digging and intuition to find .stop() so it would be helpful if this was mentioned in the readme.

The reason I didn't individually format errors instead of .start() is that I have many places where errors may be output, but only one where I need this raw trace.

Question: Is the original .stack stored anywhere? I think it would be great to be able to access it, as well as the ParsedError (to eliminate the need for other parsing packages since the message is parsed once here anyway)

Add bootstrap_node.js to list of internal libraries

As found here: https://github.com/nodejs/node/blob/e6dfd59be02c329228c050ad904e1eb046ff379f/lib/internal/bootstrap_node.js

Error, pretty-error@^0.1.18

module.js:333
    throw err;
    ^
Error: Cannot find module 'CSSSelect'
    at Function.Module._resolveFilename (module.js:331:15)
    at Function.Module._load (module.js:273:25)
    at Module.require (module.js:357:17)
    at require (module.js:373:17)
    at Object.<anonymous> (.../pretty-error/node_modules/renderkid/scripts/js/lib/renderKid/styles/rule/Selector.js:3:13)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:349:32)
    at Function.Module._load (module.js:305:12)
    at Module.require (module.js:357:17)
make: *** [web] Error 1

Feature request: Reverse stack trace / message location

Stack traces are in generall have a not-ideal representation for CLI. If the stack is longer the message and the first trace item is at the beginning of the stack output.
It would be nice if there were an option to reverse the output.

item 3
item 2
item 1

Error: The error message

---

This is lot easier to read, try it out!

Also I show a code frame (using babel code frame) of the last trace item. The problem currently is that the code frame represents the first entry, and the first entry, which stands at the first position of the list.

So there should be 2 options:

• reverseStackTrace
• showErrorOnBottom

How do I wrap style selector in parenthesis?

@AriaMinaei how do I wrap pretty-error > trace > item > footer > addr in parens? I need :before and :after selectors. Are there any other default declarations I can use?

var _ = require('lodash')
var PrettyError = require('pretty-error')
var pe = new PrettyError()

var nullStyle = {
  display: 'inline',
  background: 'none',
  color: 'none',
  bullet: 'none',
  paddingLeft: 0,
  paddingRight: 0,
  paddingBottom: 0,
  paddingTop: 0,
  marginLeft: 0,
  marginRight: 0,
  marginBottom: 0,
  marginTop: 0
}

pe.appendStyle({
  'pretty-error': _.defaults({}, nullStyle),
  'pretty-error > header': nullStyle,
  'pretty-error > header > title > kind': nullStyle,
  'pretty-error > header > colon': _.defaults({
    marginRight: 1
  }, nullStyle),
  'pretty-error > header > message': nullStyle,
  'pretty-error > trace': _.defaults({
    display: 'block',
    marginLeft: 4
  }, nullStyle),
  'pretty-error > trace > item': _.defaults({
    display: 'block',
    bullet: '"at "'
  }, nullStyle),
  'pretty-error > trace > item > header': _.defaults({

  }, nullStyle),
  'pretty-error > trace > item > header > pointer > file': _.defaults({
    display: 'none'
  }, nullStyle),
  'pretty-error > trace > item > header > pointer > colon': _.defaults({
    display: 'none'
  }, nullStyle),
  'pretty-error > trace > item > header > pointer > line': _.defaults({
    display: 'none'
  }, nullStyle),
  'pretty-error > trace > item > header > what': _.defaults({

  }, nullStyle),
  'pretty-error > trace > item > footer': _.defaults({
  }, nullStyle),
  'pretty-error > trace > item > footer > addr': _.defaults({
    // bullet: '"("'
  }, nullStyle),
  'pretty-error > trace > item > footer > extra': nullStyle
})

var e = new Error('Some error message')

var renderedError = pe.render(e)
console.log("///// native error")
console.log(e.stack)
console.log("///// pretty error")
console.log(renderedError)

Is giving me this:

///// native error
Error: Some error message
    at Object.<anonymous> (/Users/thomas/Desktop/node-reggi/z-multi-line.js:78:9)
    at Module._compile (module.js:430:26)
    at Object.Module._extensions..js (module.js:448:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:471:10)
    at startup (node.js:117:18)
    at node.js:953:3
///// pretty error
Error: Some error message
    at Object.<anonymous>/Users/thomas/Desktop/node-reggi/z-multi-line.js:78:9
    at Module._compilemodule.js:430:26
    at Object.Module._extensions..jsmodule.js:448:10
    at Module.loadmodule.js:355:32
    at Function.Module._loadmodule.js:310:12
    at Function.Module.runMainmodule.js:471:10
    at startupnode.js:117:18
    at node.js:953:3

Update renderkid to 2.0.7 and release?

Hi! I need to address some vulnerabilities including one for css-what https://www.npmjs.com/advisories/1754 which is a dependency for renderkid and fixed in renderkid 2.0.7

Would it be possible to update renderkid from 2.0.7-dev.1 (if it is in fact needed?) and also to release a new version of pretty-error (seems needed regardless as the latest has renderkid 2.0.6)?

If helpful for me to do a PR that bumps renderkid, please let me know 😄 I wanted to check in with you first!

pretty-error/package.json

Line 18 in e0ae9d2

"renderkid": "^2.0.7-dev.1"

Edit html template?

I would like to get rid of the blank lines and have each stack trace entry take only one line (with the path on the same line).
Simply changing the colors isn't enough for me, it'd be awesome if it was possible create completely custom themes, template and styles.

Extracts wrong name when used with webpack

Webpack uses query strings for it loaders.
When executing webpack code with source maps and pretty-error I get invalid file names:

  - loader.js:10 eval
    /a/path/template.jade?/a/path/loader.js:10:57

I would expect template.jade however pretty error displays loader.js.

Error message is stripped if stack exists

It seems as though the error's message is stripped if a stack trace is present (ParsedError.coffee:25):

      if typeof @_stack is 'string'
        @_parseStack()
      else
        @_message = @error.message? and String(@error.message) or ''

Resulting in something like:

(when no stack is present)

And this when there is a stack:

Support for HTML

There should be a way to prettify the error messages in html form. So that one can use it as a middleware for express.

Stand-alone binary

It would be useful to be able to npm install -g pretty-error, and get a pe-node binary or something like that, that enables pretty errors for whatever script you are trying to run - supporting something like --ignore-node and --ignore-module arguments for basic configuration. That way you don't have to hardcode it into your application or library, but you can still get pretty errors during development.

Is anything like this planned?

EDIT: For clarification, an invocation would look something like pe-node --ignore-node --ignore-module bluebird app.js

some stack miss when error is thrown in eval()

example code:

var pe = new (require("pretty-error"));

try {
    eval(`(function fn(){
        throw new Error('some error');
    })()`)
} catch(e) {
    console.log(e.stack);
    console.log(pe.render(e));
}

result:

Error: some error
    at fn (eval at <anonymous> (S:\_TEST_\index.js:4:2), <anonymous>:2:9)
    at eval (eval at <anonymous> (S:\_TEST_\index.js:4:2), <anonymous>:3:4)
    at Object.<anonymous> (S:\_TEST_\index.js:4:2)
    at Module._compile (module.js:570:32)


  Error: some error
  - index.js:4 Object.<anonymous>
    S:/_TEST_/index.js:4:2

  - module.js:570 Module._compile
    module.js:570:32

Support nesting with cause

I'm building an application which really needs nested errors. The fs can throw, but in my application just seeing what failed isn't enough to understand what action was being attempted when a failure occurred. Instead I must catch the source error, attach some additional context, and rethrow.

I'd like to be able to attach the original error as a cause. Spec-level support for this is already underway. A shim has been published as well, but while it can get a cause property set up correctly, it doesn't contain any logic about rendering causes. This library has an opportunity to be the first to present such information in a useful way and kickstart the community's ability to use this feature.

I'm going to make a fork and see what I can do.

Get raw stacktrace

I'm creating a rest api and when in development mode i also return all errors via json as well as logging it to the console. However the prettified stack trace is unreadable when it is returned as a string. Is there a way for me to get the raw stack trace before it was modified?

Example:

"message": "Cannot read property 'dataValues' of null",
"error": " �[0m�[97m�[41mError�[0m�[90m:�[0m�[37m �[0m�[97mCannot read property 'dataValues' of null�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m�[97m�[41mTypeError�[0m�[90m:�[0m�[37m �[0m�[97mCannot read property 'dataVa�[0m\ �[0m �[0m �[0m�[37mlues' of null�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[90m-�[0m �[0m�[93mloginservice.js�[0m�[90m:�[0m�[93m188�[0m�[37m �[0�[0m\ �[0m �[0m �[0m�[37mm�[37mauthenticateUser�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m �[0m�[90m/home/grimur/Documents/Repos/AuthenticationServer/src/servi�[0m\ �[0m �[0m �[0m�[37mces/loginservice.js:1�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m �[0m�[90m88:23�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[90m-�[0m �[0m�[93mq.js�[0m�[90m:�[0m�[93m794�[0m�[37m �[0m�[37m_fulf�[0m\ �[0m �[0m �[0m�[37milled�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m �[0m�[90m[AuthenticationServer]/[q]/q.js:794:54�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[90m-�[0m �[0m�[93mq.js�[0m�[90m:�[0m�[93m823�[0m�[37m �[0m�[37mself.�[0m\ �[0m �[0m �[0m�[37mpromiseDispatch.done�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m �[0m�[90m[AuthenticationServer]/[q]/q.js:823:30�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[90m-�[0m �[0m�[93mq.js�[0m�[90m:�[0m�[93m756�[0m�[37m �[0m�[37mPromi�[0m\ �[0m �[0m �[0m�[37mse.promise.promiseDispatch�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m �[0m�[90m[AuthenticationServer]/[q]/q.js:756:13�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[90m-�[0m �[0m�[93mq.js�[0m�[90m:�[0m�[93m564�[0m�[37m �[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m �[0m�[90m[AuthenticationServer]/[q]/q.js:564:44�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[90m-�[0m �[0m�[93mq.js�[0m�[90m:�[0m�[93m110�[0m�[37m �[0m�[37mflush�[0m\ �[0m �[0m �[0m�[37m�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m �[0m�[90m[AuthenticationServer]/[q]/q.js:110:17�[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m �[0m�[0m\ �[0m �[0m\ �[0m �[0m�[90m-�[0m �[0m�[37m�[0m�[0m\ �[0m �[0m\ �[0m"

Error caused by [email protected]

After reinstall the pretty-error module and upgrade renderkid from 0.2.0-beta.10 to 0.2.0-beta.11, we got the following error.

module.js:340
    throw err;
    ^
Error: Cannot find module './block/config'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/opt/app/node_modules/pretty-error/node_modules/renderkid/lib/layout/Block.js:4:15)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/opt/app/node_modules/pretty-error/node_modules/renderkid/lib/Layout.js:4:9)

Downgrade the renderkid module solve the problem.

Remove spacing between lines and tabs before tracing lines

Is there a way to remove \n between stack trace lines as well as \t before stack trace line?

A meteor package for pretty-error

I'm going to create and maintain a package thats wraps pretty-error.
You can expect some extra features provided by the package like overriding the console.log, so you don't have to find and replace everything. Of course, this is a feature that it's disable by default but you enable it.

I'm open to suggestions, feel free to suggest features and improvements.

Allow access to the rendered html + css

Hey @AriaMinaei

I am using pretty-error for the html-webpack-plugin.
The error is logged to the console and also added to the result html file.

Would it be possible to render the error message also as a html (including a style tag)?

bright-white style not working

The "bright-white" color does not seem to be working. both in the default theme or if i try to override. The resulting text is always black. Other colors seem to work without issue.

prettyError.appendStyle({
'pretty-error > header > title > kind':{
color: "bright-white"
}
}

default theme is tough to read on a white background

originally from: matthewmueller/better-error#1

Feature Request: skipReverse

Because of the nature of skip, it runs a loop from top (latest) line in the stack to the bottom (earilier) line in the stack. This limited control is preventing me from doing something I think is rather simple.

I'd like to specify a file in a stack and get everything from the first call (last instance) up.

So given this stack of addrs.

/Users/thomas/Desktop/node-reggi/delta.js
/Users/thomas/Desktop/node-reggi/gamma..js
/Users/thomas/Desktop/node-reggi/beta.js
/Users/thomas/Desktop/node-reggi/alpha.js

If I specify beta.js I'd like to skip alpha.js.

I have this working here.

//skips every addr after `node.js` (from top)
var found = false
pe.skip(function (traceLine) {
  var _found = found
  var after = 'beta.js'
  var pattern = new RegExp(after)
  var match = traceLine.path.match(pattern)
  if (match) found = true
  return _found
})

Where this fails is if beta is called twice in the stack

/Users/thomas/Desktop/node-reggi/delta.js
/Users/thomas/Desktop/node-reggi/gamma..js
/Users/thomas/Desktop/node-reggi/beta.js
/Users/thomas/Desktop/node-reggi/gamma..js
/Users/thomas/Desktop/node-reggi/beta.js
/Users/thomas/Desktop/node-reggi/alpha.js

This function will return

/Users/thomas/Desktop/node-reggi/delta.js
/Users/thomas/Desktop/node-reggi/gamma..js
/Users/thomas/Desktop/node-reggi/beta.js

instead of this, which is my desired result.

/Users/thomas/Desktop/node-reggi/delta.js
/Users/thomas/Desktop/node-reggi/gamma..js
/Users/thomas/Desktop/node-reggi/beta.js
/Users/thomas/Desktop/node-reggi/gamma..js
/Users/thomas/Desktop/node-reggi/beta.js

If there was a skipReverse function I could do this pretty easily. Is there any way to do this?

Add next_tick.js to the node.js internal packages list

Add next_tick.js to the node.js internal packages list

Add a way to disable colors

Under production, you normally store your logs into files. if the output is colored then the result is a unreadable output line with ansi codes inside.

Could be great disable colors automatically using the env variable process.env.NODE_END === 'production' or add a param like {colors: true} in the .render and .start method or in the constructor.

Also related with #16.

Question: Selecting out variables?

I'm looking for a way to pull out the lineNumber from an error like the one below.

SyntaxError: Unexpected token (210:6)

Can this be done using pretty-error?

PS. Love the library!

How to turn of line wrapping

I couldn't figure out a way to turn of line wrapping.

In CSS it would be white-space: nowrap, but its seems in RenderKid you are setting a terminal width.

My use case is that I am rendering urls which need to be clickable (using CMD + double-click on OSX). For this reason I cannot have line breaks in between urls.

Deprecated packages

npm install --save pretty-error                                                                                           130 ↵
npm WARN deprecated [email protected]: the module is now available as 'css-select'
npm WARN deprecated [email protected]: the module is now available as 'css-what'

require('pretty-error'); returns undefined

$ node

> var PrettyError = require('pretty-error');
undefined

so obviously var pe = new PrettyError(); also returns undefined and nothing works.

TypeError: this._getDeclarationClass(...).setOnto is not a function

C:\Users\i0x\Desktop\std\ace.js\node_modules\renderkid\lib\renderKid\styles\rule\DeclarationBlock.js:40
        this._getDeclarationClass(prop).setOnto(this._declarations, prop, value);
                                        ^

[TypeError: this._getDeclarationClass(...).setOnto is not a function]

C:\Users\i0x\Desktop\std\ace.js>node --version
v17.7.2

C:\Users\i0x\Desktop\std\ace.js>yarn --version
1.22.15

"pretty-error": "^4.0.0",
"renderkid": "^3.0.0"

CoffeeScript support

At the moment, CoffeeScript syntax errors get mildly mangled:

  Error: unexpected newline

  - /Users/ELLIOTTCABLE/Dropbox/Code/Paws/Paws.js/Source/additional.coffee:15:71: er
    ror: unexpected newline

  - @tput new (require('blessed').Tput) term: process.env['TERM']

  -                                                                       ^
    0m

It's not a huge deal, but it's mildly annoying to disable pretty-error if I need more information about a syntax error.

Typescript definition file please?

Could you please make typescript definitions file for pretty-error and send em to DefinitelyTyped project?

It shouldn't be a big deal, just for consistency.
https://github.com/DefinitelyTyped/DefinitelyTyped/

Changelog?

Do you have the changes to this package as they relate to version bumps documented anywhere?

Cannot parse/handle errors from electron correctly

Input:

Error: something happened
    at test (<anonymous>:1:25)
    at <anonymous>:1:47
    at EventEmitter.electron.ipcRenderer.on (/Users/sebi/jjd/js_package_nightmare-service/node_modules/electron/dist/Electron.app/Contents/Resources/electron.asar/renderer/init.js:52:28)
    at emitMany (events.js:127:13)
    at EventEmitter.emit (events.js:201:7)

Output:

  Error: something happened
  
  <anonymous>:1 test <anonymous>:1:25
  <anonymous>:1  <anonymous>:1:47

Suggestion: Create web and node versions separately

In an attempt to keep unnecessary package creep from happening, it would be very nice if there were two versions or a plugin architecture where we could depend on a version that included or did not included web/browser based rendering.

Some of the dependencies (22 packages in total once flattened; including pretty-error) are not at all needed in a server only environment.

PrettyError.skipNodeFiles() doesn't appear to work

Not sure if paths changed since previous Node versions, or if this method was only intended to include specific files but it doesn't seem to be working the way I would expect this to work.

For example, I would consider the internal/modules/cjs/loader.js file to be a Node file since I didn't create it but even when I set up this basic script, the trace still shows that file:

const PrettyError = require('pretty-error');
const pe = new PrettyError();
pe.skipNodeFiles();
pe.start();

console.log(processs.cwd()) // misspelled to cause error

Console Output

[  ReferenceError: processs is not defined
  
  - server.js:35 Object.<anonymous>
    [project]/server-express/server.js:35:13
  
  - loader.js:1063 Module._compile
    internal/modules/cjs/loader.js:1063:30
  
  - loader.js:1092 Object.Module._extensions..js
    internal/modules/cjs/loader.js:1092:10
  
  - loader.js:928 Module.load
    internal/modules/cjs/loader.js:928:32
  
  - loader.js:769 Function.Module._load
    internal/modules/cjs/loader.js:769:14
  
  - loader.js:952 Module.require
    internal/modules/cjs/loader.js:952:19
  
  - helpers.js:88 require
    internal/modules/cjs/helpers.js:88:18
  
  - www:7 Object.<anonymous>
   ./bin/www:7:13
  
  - loader.js:1063 Module._compile
    internal/modules/cjs/loader.js:1063:30
  
  - loader.js:1092 Object.Module._extensions..js
    internal/modules/cjs/loader.js:1092:10
  
]

I'm pretty sure that this is because the nodePaths.coffee references exact filenames, and the relevant code is just using indexOf to check if the stack path is a "Node" file.

I'll add that I'm making a lot of assumptions here, so apologies if I'm misunderstanding the skipNodeFiles method or anything else.

Thanks for all the work on the project so far!

Feature request: show filtered line but dim it

Filtering is very useful to cleanup the stacktrace.
However often the stacktrace could be strange to read especially when there are anonymous entries. It would be nice if there were an option to mark filtered entries so the filtered line could be outputed also but style with render kid as less important entry. Of course this makes only sense in color output mode.

not working on iojs

I'm getting a console warning when requiring the module:

sys is deprecated. Use util instead.

and when try to prettify an error, I got this exception:

/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/layout/SpecialString.js:18
    if (this.constructor !== self) {
            ^
TypeError: Cannot read property 'constructor' of undefined
    at SpecialString (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/layout/SpecialString.js:16:13)
    at Block.module.exports.Block._writeInline (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/layout/Block.js:196:9)
    at Block.module.exports.Block._flushBuffer (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/layout/Block.js:165:10)
    at Block.module.exports.Block._deactivate (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/layout/Block.js:93:10)
    at Block.module.exports.Block._activate (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/layout/Block.js:82:22)
    at Block.module.exports.Block._open (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/layout/Block.js:123:10)
    at Block.module.exports.Block.openBlock (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/layout/Block.js:154:11)
    at RenderKid.module.exports.RenderKid._renderBlockNode (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/RenderKid.js:149:25)
    at RenderKid.module.exports.RenderKid._renderNode (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/RenderKid.js:124:12)
    at RenderKid.module.exports.RenderKid._renderChildrenOf (/mnt/repositories/repositories/termite-modules/she/node_modules/pretty-error/node_modules/renderkid/lib/RenderKid.js:114:12)

'color': 'none' still applies ansi codes

"Error\u001b[0m:\u001b[0m \u001b[0mSome error message\u001b[0m\n\u001b[0m    \u001b[0mat\u001b[0m Object.<anonymous>\u001b[0m (/Users/thomas/Desktop/node-reggi/z-multi-line.js:89:9)\u001b[0m\n\u001b[0m    \u001b[0mat\u001b[0m Module._compile\u001b[0m (module.js:430:26)\u001b[0m\n\u001b[0m    \u001b[0mat\u001b[0m Object.Module._extensions..js\u001b[0m (module.js:448:10)\u001b[0m\n\u001b[0m    \u001b[0mat\u001b[0m Module.load\u001b[0m (module.js:355:32)\u001b[0m\n\u001b[0m    \u001b[0mat\u001b[0m Function.Module._load\u001b[0m (module.js:310:12)\u001b[0m\n\u001b[0m    \u001b[0mat\u001b[0m Function.Module.runMain\u001b[0m (module.js:471:10)\u001b[0m\n\u001b[0m    \u001b[0mat\u001b[0m startup\u001b[0m (node.js:117:18)\u001b[0m\n\u001b[0m    \u001b[0mat\u001b[0m \u001b[0mnode.js:953:3\u001b[0m\n\u001b[0m"

I can use chalk.stripColor(string) to remove them. Didn't expect ansi codes when color wasn't applied.

Tests?

Just noticed there aren't any tests. How do you make sure it works when you are making changes?

Render: from should not be larger than to

/home/travis/build/project-x/auth/node_modules/pretty-error/lib/ParsedError.js:23
      this._stack = this.error.stack;
                              ^
Error: `from` shouldn't be larger than `to`

This happened when I ran render(error) for an error that mongodb throws using their native driver while creating indexes. I could not figure out exactly what the error was but render was the culprit.

When inline element is null styles are still applied?

In my append style I have the trace for what and footer > addr both set to marginLeft:1.

  'pretty-error > 
trace > item > header > what': _.defaults({
    marginLeft: 1
  }, nullStyle),
  'pretty-error > trace > item > footer': _.defaults({
  }, nullStyle),
  'pretty-error > trace > item > footer > addr': _.defaults({
    marginLeft: 1
  }, nullStyle),

You can see the last line in the trace doesn't have a what element.

      {
        "item": {
          "header": {
            "pointer": {
              "file": "node.js",
              "colon": ":",
              "line": 953
            },
            "what": null
          },
          "footer": {
            "addr": "node.js:953:3"
          }
        }
      }

However the on last line, after the bullet there are two spaces instead of one.

Error: Some error message
    at Object.<anonymous> /Users/thomas/Desktop/node-reggi/z-multi-line.js:57:9
    at Module._compile module.js:430:26
    at Object.Module._extensions..js module.js:448:10
    at Module.load module.js:355:32
    at Function.Module._load module.js:310:12
    at Function.Module.runMain module.js:471:10
    at startup node.js:117:18
    at  node.js:953:3

This is unexpected behavior. Without both of these margins set there is no space after the at bullet.

I simply want to output:

Error: Some error message
    at Object.<anonymous> /Users/thomas/Desktop/node-reggi/z-multi-line.js:57:9
    at Module._compile module.js:430:26
    at Object.Module._extensions..js module.js:448:10
    at Module.load module.js:355:32
    at Function.Module._load module.js:310:12
    at Function.Module.runMain module.js:471:10
    at startup node.js:117:18
    at node.js:953:3

Coding style

I'm thinking about making a patch and curious about unusual coding style i'm seeing. There are a lot of blank lines. Wondering if this is intentional or a side effect of the editor you are using?

wheres the default theme?

the link on the readme is broke :/