pretty-var-export

1.1.7 • Public • Published

pretty-var-export

Build Status Code Coverage MIT License

Export any value to valid and equivalent JavaScript code. Uses syntax coloring for debugging from the cli.

npm install pretty-var-export

Usage

const pretty = require('pretty-var-export');

// return string suitable for logging
console.log(pretty(myValue));

// OR prettify and log
pretty.log(myValue);

// OR import and log in one line
require('pretty-var-export').log(myValue);

Note that coloring can be disabled with pretty.colors.disable().

Example output

Example

Customization

Add handler

Add custom handlers for formatting.

For example, show NaN as a different color than numbers:

const pretty = require('pretty-var-export');

// each handler must have a test and format method
pretty.handlers.add('nan', {
	test: isNaN,
	format: () => pretty.colors.palette.cyan('NaN'),
});

// reset to default list
pretty.handlers.reset();

Remove handler

You can remove handlers by name.

const pretty = require('pretty-var-export');

// see below for list of names
pretty.handlers.remove('nan');

// reset to default list
pretty.handlers.reset();

Default handler names:

  • arguments
  • Array
  • BigInt
  • Boolean
  • Date
  • Error
  • Function
  • Map
  • null
  • Number
  • Object
  • Promise
  • RegExp
  • Set
  • String
  • Symbol
  • TypedArray
  • undefined
  • URL
  • URLSearchParams
  • WeakMap
  • WeakSet

Custom indent

By default, indentation is 2 spaces.

const pretty = require('pretty-var-export');

pretty.options.indent = 4; // 4 spaces
pretty.options.indent = '    '; // 4 spaces
pretty.options.indent = '\t'; // tab

Custom colors

Colors come from the ansi-colors npm module.

Formats include the following:

  • boolean for true and false (default yellow)
  • comment for comments (default gray)
  • constructor for instantiation (default blue)
  • escape for string escapes (default yellowBright)
  • null for null (default yellow)
  • number for numbers, NaN, Infinity (default red)
  • property for object property names (default cyan)
  • regexp for bodies of regular expressions (default blue)
  • string for strings (default green)
  • symbol for quotes, braces, parens, commas, colons (default white)
  • undefined for undefined (default yellow)
const pretty = require('pretty-var-export');

// existing color functions from the ansi-colors npm package
pretty.colors.symbol = pretty.colors.palette.blueBright;

// use any other function
pretty.colors.string = chalk.green;

// disable all coloring
pretty.colors.disable();

// reset to default colors and re-enable coloring
pretty.colors.reset();

Custom display options

There are a few options that can change display. Below are defaults.

const pretty = require('pretty-var-export');

// if true, show function bodies
pretty.options.showFunctionBody = false;

// the max length for strings
pretty.options.maxStringLength = 1024 * 4;

// max number of items to list
pretty.options.maxListItems = 100;

// output multi-line strings with backticks
pretty.options.preferBackticks = true;

// quote style for default strings (single, double or backtick)
pretty.options.quoteStyle = 'double';

// reset to defaults
pretty.options.reset();

Custom labels

Labels can be changed or translated.

const pretty = require('pretty-var-export');

// defaults
pretty.labels.circularReference = 'Circular Reference';
pretty.labels.codeOmitted = 'Code Omitted';
pretty.labels.itemsUnknown = 'Items Unknown';

// reset to defaults
pretty.labels.reset();

Changelog

See CHANGELOG.md

Contributing

Please open a ticket or PR on GitHub.

License

MIT License

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Install

npm i pretty-var-export

Weekly Downloads

1,081

Version

1.1.7

License

MIT

Unpacked Size

228 kB

Total Files

64

Last publish

Collaborators

  • kensnyder