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# SpellChecker Node Module [](https://travis-ci.org/atom/node-spellchecker) [](https://ci.appveyor.com/project/kevinsawicki/node-spellchecker/branch/master) Native bindings to [NSSpellChecker](https://developer.apple.com/library/mac/#documentation/cocoa/reference/ApplicationKit/Classes/NSSpellChecker_Class/Reference/Reference.html), [Hunspell](http://hunspell.sourceforge.net/), or the [Windows 8 Spell Check API](https://msdn.microsoft.com/en-us/library/windows/desktop/hh869853(v=vs.85).aspx), depending on your platform. Windows 7 and below as well as Linux will rely on Hunspell. ## Installing ```bash npm install spellchecker ``` ## Using ```coffeescript SpellChecker = require 'spellchecker' ``` ### SpellChecker.isMisspelled(word) Check if a word is misspelled. `word` - String word to check. Returns `true` if the word is misspelled, `false` otherwise. ### SpellChecker.getCorrectionsForMisspelling(word) Get the corrections for a misspelled word. `word` - String word to get corrections for. Returns a non-null but possibly empty array of string corrections. ### SpellChecker.checkSpelling(corpus) Identify misspelled words in a corpus of text. `corpus` - String corpus of text to spellcheck. Returns an Array containing `{start, end}` objects that describe an index range within the original String that contains a misspelled word. ### SpellChecker.checkSpellingAsync(corpus) Asynchronously identify misspelled words. `corpus` - String corpus of text to spellcheck. Returns a Promise that resolves with the Array described by `checkSpelling()`. ### SpellChecker.add(word) Adds a word to the dictionary. When using Hunspell, this will not modify the .dic file; new words must be added each time the spellchecker is created. Use a custom dictionary file. `word` - String word to add. Returns nothing. ### new Spellchecker() In addition to the above functions that are used on a default instance, a new instance of SpellChecker can be instantiated with the use of the `new` operator. The same methods are available with the instance but the dictionary and underlying API can be changed independently from the default instance. ```javascript const checker = new SpellChecker.Spellchecker() ``` #### SpellChecker.Spellchecker.setSpellcheckerType(type) Overrides the library selection for checking. Without this, the checker will use [Hunspell](http://hunspell.github.io/) on Linux, the [Spell Checking API](https://docs.microsoft.com/en-us/windows/desktop/intl/spell-checker-api) for Windows, and [NSSpellChecker](https://developer.apple.com/documentation/appkit/nsspellchecker) on Macs. If the environment variable `SPELLCHECKER_PREFER_HUNSPELL` is set to any value, the library will fallback to always using the Hunspell implementation. This is the same behavior as calling `setSpellcheckerType` with the `USE_SYSTEM_DEFAULTS` constant: ```coffeescript checker = new SpellChecker.Spellchecker checker.setSpellcheckerType SpellChecker.USE_SYSTEM_DEFAULTS ``` To always use the system API and not fallback to Hunspell regardless of the environment variable, use the `ALWAYS_USE_SYSTEM` constant: ```coffeescript checker = new SpellChecker.Spellchecker checker.setSpellcheckerType SpellChecker.ALWAYS_USE_SYSTEM ``` Likewise, Hunspell can be forced with the `ALWAYS_USE_HUNSPELL` constant. ```javascript const checker = new SpellChecker.Spellchecker(); checker.setSpellcheckerType(SpellChecker.ALWAYS_USE_SYSTEM); ``` On Linux, Hunspell is always used regardless of the setting. This method must also be called before any spelling is done otherwise it will throw an error. This returns nothing.
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