precinct

Unleash the detectives

npm install precinct

Uses the appropriate detective to find the dependencies of a file or its AST.

Supports:

• JavaScript modules: AMD, CommonJS, and ES6
• TypeScript
• CSS Preprocessors: Sass, Scss, Stylus, and Less
• CSS (PostCSS)
• Vue

Usage

const fs = require('fs');
const precinct = require('precinct');

const content = fs.readFileSync('myFile.js', 'utf8');

// Pass in a file's content or an AST
const deps = precinct(content);

You may pass options (to individual detectives) based on the module type via an optional second object argument detective(content, options), for example:

Example call:

precinct(content, {
  amd: {
    skipLazyLoaded: true
  },
  type: 'amd'
});

• The supported module type prefixes are: amd, commonjs, css, es6, less, sass, scss, stylus, ts, tsx, vue.

Current options:

• amd.skipLazyLoaded: tells the AMD detective to omit lazy-loaded dependencies (i.e., inner requires).

• es6.mixedImports: allows for all dependencies to be fetched from a file that contains both CJS and ES6 imports.

  • Note: This will work for any file format that contains an ES6 import.

• css.url: tells the CSS detective to include url() references to images, fonts, etc.

• walker: options passed directly to the underlying node-source-walk instance.

  Example:

  precinct(content, {
    walker: {
      allowImportExportEverywhere: true
    }
  });
  
  // Or supply a fully custom parser:
  precinct(content, {
    walker: {
      parser: myCustomParser // any object with a .parse(src, opts) method
    }
  });

Finding non-JavaScript (ex: Sass and Stylus) dependencies:

const fs = require('fs');
const content = fs.readFileSync('styles.scss', 'utf8');

const sassDeps = precinct(content, { type: 'sass' });
const stylusDeps = precinct(content, { type: 'stylus' });

Or, if you just want to pass in a filepath and get the dependencies:

const { paperwork } = require('precinct');

const deps = paperwork('myFile.js');
const deps2 = paperwork('styles.scss');

precinct.paperwork(filename, options)

Supported options:

• includeCore: (default: true) set to false to exclude core Node.js dependencies from the list of dependencies.
• fileSystem: (default: undefined) set to an alternative fs implementation that will be used to read the file path.
• walker: (default: undefined) options forwarded to the underlying node-source-walk instance - same as the top-level walker option.
• You may also pass detective-specific configuration like you would to precinct(content, options).

CLI

Assumes a global install precinct with npm install -g precinct.

precinct [options] path/to/file

Run precinct --help to see all options.

License

MIT