Pattern Lab Node Events

Pattern Lab emits numerous events during the build process. Some uses of events:

• Core uses patternlab-pattern-change events when watching for changes in order to trigger another build
• Plugins such as plugin-tab can use an event like patternlab-pattern-write-end to define additional code tabs to the pattern viewer / modal

Learn more about Creating Plugins.

Events

EVENTS ⏏

Kind: Exported constant

EVENTS~PATTERNLAB_BUILD_START

Emitted before any logic run inside build(), which is the entry point for single builds, pattern-only builds, run singly or when watched.

Kind: inner property of EVENTS
Properties

Name	Type	Description
patternlab	object	global data store

EVENTS~PATTERNLAB_BUILD_END

Emitted after all logic run inside build(), which is the entry point for single builds, pattern-only builds, run singly or when watched.

Kind: inner property of EVENTS
Properties

Name	Type	Description
patternlab	object	global data store

EVENTS~PATTERNLAB_PATTERN_ITERATION_END

Emitted after patterns are iterated over to gather data about them. Right before Pattern Lab processes and renders patterns into HTML

Kind: inner property of EVENTS
Properties

Name	Type	Description
patternlab	object	global data store

EVENTS~PATTERNLAB_BUILD_GLOBAL_DATA_END

Emitted after global data.json and listitems.json are read, and the supporting Pattern Lab templates are loaded into memory (header, footer, patternSection, patternSectionSubType, viewall). Right before patterns are iterated over to gather data about them.

Kind: inner property of EVENTS
Properties

Name	Type	Description
patternlab	object	global data store

EVENTS~PATTERNLAB_PATTERN_BEFORE_DATA_MERGE

Emitted before all data is merged prior to a Pattern's render. Global data.json is merged with any pattern .json. Global listitems.json is merged with any pattern .listitems.json.

Kind: inner property of EVENTS
See: Pattern
Properties

Name	Type	Description
patternlab	object	global data store
pattern	Pattern	current pattern

EVENTS~PATTERNLAB_PATTERN_WRITE_BEGIN

Emitted before a pattern's template, HTML, and encoded HTML files are written to their output location

Kind: inner property of EVENTS
See: Pattern
Properties

Name	Type	Description
patternlab	object	global data store
pattern	Pattern	current pattern

EVENTS~PATTERNLAB_PATTERN_WRITE_END

Emitted after a pattern's template, HTML, and encoded HTML files are written to their output location

Kind: inner property of EVENTS
See: Pattern
Properties

Name	Type	Description
patternlab	object	global data store
pattern	Pattern	current pattern

EVENTS~PATTERNLAB_PATTERN_ASSET_CHANGE

Invoked when a watched asset changes. Assets include anything in source/ that is not under ['root', 'patterns', 'data', 'meta', 'annotations', 'patternlabFiles'] which are blacklisted for specific copying.

Kind: inner property of EVENTS
Properties

Name	Type	Description
fileInfo	object	{file: 'path/to/file.css', dest: 'path/to/destination'}

EVENTS~PATTERNLAB_GLOBAL_CHANGE

Invoked when a watched global file changes. These are files within the directories specified in ['data', 'meta']paths.

Kind: inner property of EVENTS
Properties

Name	Type	Description
fileInfo	object	{file: 'path/to/file.ext'}

EVENTS~PATTERNLAB_PATTERN_CHANGE

Invoked when a pattern changes.

Kind: inner property of EVENTS
Properties

Name	Type	Description
fileInfo	object	{file: 'path/to/file.ext'}

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Pattern Lab Node is MIT Licensed