unified-engine

Engine to process multiple files with unified, allowing users to configure from the file system.

Projects

The following projects wrap the engine:

• unified-args — Create CLIs for processors
• unified-engine-gulp — Create Gulp plugins
• unified-engine-atom — Create Atom Linters for processors
• unified-language-server — Create language servers for processors

Install

This package is ESM only: Node 12+ is needed to use it and it must be imported instead of required.

npm:

1npm install unified-engine

Use

The following example processes all files in the current directory with a Markdown extension with remark, allows configuration from .remarkrc and package.json files, ignoring files from .remarkignore files, and more.

1import {engine} from 'unified-engine'
2import {remark} from 'remark'
3
4engine(
5  {
6    processor: remark,
7    files: ['.'],
8    extensions: ['md', 'markdown', 'mkd', 'mkdn', 'mkdown'],
9    pluginPrefix: 'remark',
10    rcName: '.remarkrc',
11    packageField: 'remarkConfig',
12    ignoreName: '.remarkignore',
13    color: true
14  },
15  done
16)
17
18function done(error) {
19  if (error) throw error
20}

Contents

• API
  • engine(options, callback)
• Plugins
• Configuration
• Ignoring
• Security
• Contribute
• License

API

This package exports the following identifiers: engine. There is no default export.

engine(options, callback)

Process files according to options and call callback when done.

options

• processor (Processor) — unified processor to transform files
• cwd (string, default: process.cwd()) — Directory to search files in, load plugins from, and more
• files (Array<string|VFile>, optional) — Paths or globs to files and directories, or virtual files, to process
• extensions (Array<string>, optional) — If files matches directories, include files with extensions
• streamIn (ReadableStream, default: process.stdin) — Stream to read from if no files are found or given
• filePath (string, optional) — File path to process the given file on streamIn as
• streamOut (WritableStream, default: process.stdout) — Stream to write processed files to
• streamError (WritableStream, default: process.stderr) — Stream to write the report (if any) to
• out (boolean, default: depends) — Whether to write the processed file to streamOut
• output (boolean or string, default: false) — Whether to write successfully processed files, and where to
• alwaysStringify (boolean, default: false) — Whether to always serialize successfully processed files
• tree (boolean, default: false) — Whether to treat both input and output as a syntax tree
• treeIn (boolean, default: tree) — Whether to treat input as a syntax tree
• treeOut (boolean, default: tree) — Whether to treat output as a syntax tree
• inspect (boolean, default: false) — Whether to output a formatted syntax tree
• rcName (string, optional) — Name of configuration files to load
• packageField (string, optional) — Property at which configuration can be found in package.json files
• detectConfig (boolean, default: whether rcName or packageField is given) — Whether to search for configuration files
• rcPath (string, optional) — Filepath to a configuration file to load
• settings (Object, optional) — Configuration for the parser and compiler of the processor
• ignoreName (string, optional) — Name of ignore files to load
• detectIgnore (boolean, default: whether ignoreName is given) — Whether to search for ignore files
• ignorePath (string, optional) — Filepath to an ignore file to load
• ignorePathResolveFrom ('dir' or 'cwd', default: 'dir') — Resolve patterns in ignorePath from the current working directory or the file’s directory
• ignorePatterns (Array<string>, optional) — Patterns to ignore in addition to ignore files, if any
• silentlyIgnore (boolean, default: false) — Skip given files if they are ignored
• plugins (Array|Object, optional) — Plugins to use
• pluginPrefix (string, optional) — Optional prefix to use when searching for plugins
• configTransform (Function, optional) — Transform config files from a different schema
• reporter (string or function, default: import {reporter} from 'vfile-reporter') — Reporter to use
• reporterOptions (Object?, optional) — Config to pass to the used reporter
• color (boolean, default: false) — Whether to report with ANSI color sequences
• silent (boolean, default: false) — Report only fatal errors
• quiet (boolean, default: silent) — Do not report successful files
• frail (boolean, default: false) — Call back with an unsuccessful (1) code on warnings as well as errors

function callback(error[, code, context])

Called when processing is complete, either with a fatal error if processing went horribly wrong (probably due to incorrect configuration), or a status code and the processing context.

Parameters

• error (Error) — Fatal error
• code (number) — Either 0 if successful, or 1 if unsuccessful. The latter occurs if fatal errors happen when processing individual files, or if frail is set and warnings occur
• context (Object) — Processing context, containing internally used information and a files array with the processed files

Plugins

doc/plugins.md describes in detail how plugins can add more files to be processed and handle all transformed files.

Configuration

doc/configure.md describes in detail how configuration files work.

Ignoring

doc/ignore.md describes in detail how ignore files work.

Security

unified-engine loads and evaluates configuration files, plugins, and presets from the file system (often from node_modules/). That means code that is on your file system runs. Make sure you trust the workspace where you run unified-engine and be careful with packages from npm and changes made by contributors.

Contribute

See contributing.md in unifiedjs/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MIT © Titus Wormer