gulp-build-fozzie :bear:

Gulp build tasks for use across Fozzie modules.

Contents

• Setup
  • Optional setup
    • Transpile es2015 code
    • JavaScript Linting
    • CSS Linting
  • Config and pathBuilder
    • Config object
    • pathBuilder object
• The Gulp Tasks
  • Development-only tasks
• Config
  • Other config
• Path Builder
• Running the unit tests

Setup

First, add gulp and gulp-build-fozzie as dependencies

yarn add gulp @justeat/gulp-build-fozzie

Next, inside your gulpfile.js, require the build function from @justeat/gulp-build-fozzie, then pass gulp as the first argument.

const gulp = require('gulp');
const { build } = require('@justeat/gulp-build-fozzie');

build(gulp, /*options*/);

You can optionally pass in options which will override the default config values.

That's it! You can now run any of the Gulp tasks.

Optional setup

Transpile es2015 code

To ensure that the scripts:bundle task can transpile es2015 code, add a .babelrc file, with the @babel/preset-env preset, to the root of your project:

{
    "presets": ["@babel/preset-env"]
}

If you do not add a .babelrc file (you may be writing es5 code for example) then the code will be bundled up as is.

JavaScript Linting

Add an .eslintrc file to the root of your project with the following content to use the JS linting rules we recommend when running the scripts:lint task:

{
    "extends": "@justeat/eslint-config-fozzie"
}

If you wish to extend or override these rules you can simply add them after the extends line in the .eslintrc file.

For more information on how you can configure eslint check out the documentation.

N.b. You may also find that you get an error when adding eslint which reads Parsing error: Cannot read property 'ecmaFeatures' of undefined. If you see this message, then add this to your package.json followed by running yarn install:

"resolutions": {
  "espree": "3.5.4"
}

This is a temporary fix dependent on the progress of this issue open on ESLint.

CSS Linting

To use our recommended fozzie stylelint linting rules add the following into your package.json file:

"stylelint": {
    "extends": "@justeat/stylelint-config-fozzie"
}

If you wish to extend or override these rules you can simply add them after the extends line in the package.json file.

For more information on how you can configure stylelint check out the documentation.

Config and pathBuilder

You can also access the config and pathBuilder objects which are used inside of gulp-build-fozzie by requiring them:

const { config, pathBuilder } = require('@justeat/gulp-build-fozzie');

These are exposed for convenience, and means that you do not need to manually build paths and maintain a separate config object for any custom tasks in your project. It also reduces duplication and prevents bugs which can arise from specifying incorrect paths.

config object

This is the config object which is used inside of gulp-build-fozzie, if you have passed any options via the build method they will be available here.

See the Options section below for the details of this object.

pathBuilder object

The pathBuilder object is used inside of gulp-build-fozzie in order to build the paths used in the gulp tasks.

See the Path Builder section below for details on which paths are available.

The Gulp Tasks

css

Runs the following tasks

• scss:lint

  Lint all SCSS files in the source directory — this runs before the css:bundle task.

  This task will also automatically fix any errors that it can (through stylelint's autofix setting).

• css:lint

  Lint all CSS files in the dist directory — this runs after the css:bundle task.

• clean:css

  Removes any CSS already in the dist directory.

• css:bundle

  Performs a variety of tasks including;

  • Makes environment variables available to Sass
  • Pull in Eyeglass modules
  • Run postcss plugins
  • Minify the CSS
  • Add hashed version to file name
  • Output bundle to the dist directory

scripts

Runs the following tasks

• scripts:lint

  Lint all JavaScript in the source directory. This task will also attempt to automatically fix any rules via the ESLint --fix flag.

• scripts:test

  Runs any unit tests found in the JavaScript source directory using Jest.

• scripts:test:coverage

  Runs the JS unit tests and display a coverage report once complete.

• clean:scripts

  Removes any JavaScript already in the dist directory.

• Custom Tasks

  The names of custom tasks can be passed into the config object to be run here. See customTasks for more details.

• scripts:bundle

  Performs a variety of tasks including;

  • ES2015 transpilation using Babel
  • Bundle all code into a single file
  • Generate sourcemap files
  • Minify the JavaScript
  • Add hashed version to file name
  • Output bundle to the dist directory

logger:createFile

Adds the server-side file required for the errorLogger to be inserted into the filesystem.

images

Runs the following tasks

• clean:images

  Removes any images already in the dist directory.

• images:optimise

  Optimises all images found in the source directory then copies them to the dist directory.

• images:svg-sprite

  Generate an SVG sprite and copy into the dist directory

It also runs the copy:img and copy:assets tasks.

service-worker

Runs the following tasks

• service-worker:locate

Discovers scripts in the service worker directory.

• service-worker:copy

Copies the worker's internal scripts to the dist directory.

• service-worker:write

Generates a service worker to pre-cache the assets defined in the config.

copy:js, copy:css, copy:img, copy:fonts & copy:docs

Each of these tasks copies the specified set of assets from the src to the dist asset folders.

See the config section for details on how to configure these tasks.

watch

Runs the default task then the following watch tasks.

• watch:css

Runs the css task when a CSS file is changed.

• watch:scripts

Runs the scripts task when a JavaScript file is changed.

• watch:scripts:test

Runs the scripts:lint and scripts:test tasks when a JavaScript unit test file is changed.

• watch:images

Runs the images task when an image file is changed.

watch:docs

Runs the same tasks as watch as well as the following watch tasks.

• watch:docs:templates

Runs the assemble task when documentation files are changed.

Development-only tasks

• docs

Builds a fresh copy of any documentation found in the config.docs.rootDir directory using Assemble, then watches for any file changes and reloads the web page when changes are detected in the config.docs.distDir directory.

• docs:deploy

Builds the documentation and then pushes the dist directory to the gh-pages branch.

• docs:release

Pushes the documentation dist directory to the gh-pages branch.

• clean:docs

Removes document files already in the docs dist directory.

• copy:img:docs

Copies all of the images in the assets dist folder over to the docs dist folder.

• browser-sync

Watches for changes to files and reloads a local website instance.

• browser-sync:docs

Generates the documentation files then opens the docs in a local server.

• assemble

Generates the documentation files.

Config

Here is the outline of the configuration options, descriptions of each are below.

{
    webRootDir,
    assetSrcDir,
    assetDistDir,
    applyRevision,
    packageVersion,
    css: {
        scssDir,
        cssDir,
        lintPaths,
        sourcemaps,
        usePackageVersion
    },
    js: {
        files: {
            main: {
                srcPath,
                distFile
            },
            …
        ],
        customTasks,
        jsDir,
        lintPaths,
        allowEmpty
        usePackageVersion,
        stripDebug
    },
    logger: {
        dir,
        file
    },
    img: {
        imgDir,
        optimiseImages,
        optimiseSVGs,
        optimiseGIFs,
        optimiseJPEGs,
        optimisePNGs,
        spriteSvgs,
        svgSpriteFilename,
    },
    importedAssets: {
        importedAssetsSrcGlob,
        verbose
    },
    sw: {
        isEnabled,
        swDir,
        outputFile,
        staticFileGlobs,
        dynamicFileRegex,
        dynamicFileStrategy,
        importScripts,
        cacheId
    },
    copy: {
        js,
        css,
        img,
        fonts,
        docs
    },
    docs: {
        rootDir,
        srcDir,
        distDir,
        assetDir,
        templDir,
        dataDir,
        outputAssets,
        remoteBase,
        helpers,
        excludeTemplateDirs
    },
    fonts: {
      fontsDir
    },
    browserSync: {
        files,
        proxy,
        reloadDebounce
    },
    misc: {
        showFileSize,
        showFiles
    },
    gulp: {
        changeEvent,
        onError
    },
    isProduction,
    isDev
}

webRootDir

Type: string

Default: '.'

The root directory of your website.

assetSrcDir

Type: string

Default: 'src'

Root source directory for your assets.

assetDistDir

Type: string

Default: 'dist'

Root dist directory for your assets.

applyRevision

Type: boolean

Default: true

Will add a content hash to the JS and CSS filenames, generating a new filename if any of the file's contents have changed. This can be utilised to force the clients to get the latest version of an updated asset.

packageVersion

Type: String

Returns the current package version.

css

• scssDir

  Type: string

  Default: 'scss'

  The directory where your SCSS files reside.

• cssDir

  Type: string

  Default: 'css'

  The bundled CSS file will be output to this directory.

• lintPaths

  Type: array

  Default: ['']

  Allows additional paths to be included or excluded from the linting task.

  By default, the task will lint all .scss files within the scssDir directory.

• sourcemaps

  Type: boolean

  Default: isDev

  Turns sourcemaps on or off.

• usePackageVersion

  Type: boolean

  Default: false

  When set to true this will bundle a versioned css file e.g 'filename-[version].css'.

js

• files

  Type: Object

  Default:

  {
      main: {
          srcPath: 'index.js',
          distFile: 'script.js'
      }
  }

  An Object, that takes one or more child objects each describing a JavaScript bundle entry point and destination. Each of these objects can have the following properties:

  • srcPath

    Type: string

    Default: 'index.js'

    The file path to a bundle entry point in your JavaScript.

  • distFile

    Type: string

    Default: 'script.js'

    The filename for the JavaScript bundle once compiled.

• customTasks

  Type: array<string>

  Default: []

  Array of strings, containing the names of the custom tasks to be run as part of the gulp:scripts command, in parallel with scripts:bundle.

  These should be defined by (or made available within) the consuming application, e.g., compiling third-party libraries within a scripts:libs task.

  Gulp 4 does not easily allow for the entire default gulp:scripts implementation to be overridden, so any extra JS-related tasks that you need to run should be passed in here.

• jsDir

  Type: string

  Default: 'js'

  Name of the directory where all of your JavaScript files are kept.

  Compiled JavaScript files will be placed inside a directory with the same name.

• lintPaths

  Type: array

  Default: ['']

  Allows additional paths to be included or excluded from the JS linting task.

  By default, the task will lint all files within the jsDir directory.

• allowEmpty

  Type: boolean

  Default: true

  When set to true, it will allow the globbing patterns not to return any files without failing. If set to false, no files will result in an exception.

• usePackageVersion

  Type: boolean

  Default: false

  When set to true this will bundle a versioned JS file e.g 'filename-[version].js'.

• stripDebug

  Type: boolean

  Default: true

  This can also be controlled using the --noStripDebug flag. When this flag is added, console.log() statements will not be removed for production builds.

  Examples:

  gulp scripts:bundle --prod --noStripDebug

  This would generate the JS files as part of a production build, but would still include console.log() statements. Intended for QA releases.

  gulp scripts:bundle --prod

  This is a normal production build and would not include console.log() statements.

  gulp scripts:bundle --noStripDebug

  For non-production builds, the flag has no effect: you will still get debug statements even if include the flag.

logger

• dir

  Type: string

  Default: 'js/shared'

  Name of the directory where your js error logger file will live.

• file

  Type: string

  Default: 'js-error.js'

  Name of the error logger file.

img

• imgDir

  Type: string

  Default: 'img'

  Name of the directory where your image files are kept.

  Processed image files will be placed inside a directory with the same name.

• optimiseImages

  Type: boolean

  Default: 'true'

  Controls whether or not all image typesare optimised as part of the image tasks.

• optimiseSVGs

  Type: boolean

  Default: 'true'

  Controls whether or not SVGs are optimised as part of the image tasks.

• optimiseGIFs

  Type: boolean

  Default: 'true'

  Controls whether or not GIFs are optimised as part of the image tasks.

• optimiseJPEGs

  Type: boolean

  Default: 'true'

  Controls whether or not JPEGs are optimised as part of the image tasks.

• optimisePNGs

  Type: boolean

  Default: 'true'

  Controls whether or not PNGs are optimised as part of the image tasks.

• spriteSvgs

  Type: boolean

  Default: 'true'

  Controls whether or not SVGs are turned into an SVG Sprite as part of the image tasks

• svgSpriteFilename

  Type: string

  Default: 'sprite.svg'

  Filename of the SVG sprite which is generated from any SVG assets found in the image directory.

importedAssets

• importedAssetsSrcGlob

  Type: string

  Default: 'node_modules/@justeat/*/'

  Glob of packages containing assets to be copied to assetDistDir.

• verbose

  Type: boolean

  Default: 'true'

  Whether to log the names of all assets being copied. Passed on to f-copy-assets.

sw

• isEnabled

  Type: boolean

  Default: false

  Determines whether the service worker is generated or not.

• swDir

  Type: string

  Default: 'sw'

  Name of the directory where your service worker's custom internal scripts are kept in.

  Scripts here will be placed inside a directory with the same name.

• outputFile

  Type: string

  Default: 'service-worker.js'

  The name of the generated service worker file, to be placed in the root of your application.

• staticFileGlobs

  Type: array

  Default: []

  The static files in your application to be cached by the service worker.

• dynamicFileRegex

  Type: array

  Default: []

  An array of regex to match the dynamic content or API calls to cache e.g. [/^https:\/\/example\.com\/api/, /^https:\/\/fonts.googleapis.com\/css/].

• dynamicFileStrategy

  Type: string

  Default: cacheFirst

  The cache strategy to be used for content matched by dynamicFileRegex - these correspond to the sw-toolbox handlers.

• importScripts

  Type: array

  Default: []

  Any additional internal scripts to include, aside from those in swDir.

• cacheId

  Type: string

  Default: ''

  An optional string used to differentiate caches on the same origin during local development.

copy

• js, css img, fonts & docs

  Type: Object

  Default: {}

  copy.js, copy.css, copy.img, copy.fonts and copy.docs each take an object list of assets in the format:

    copy:
      js: {
        prism: {
            path: '/libs/**/*',
            dest: '/libs',
            revision: false
        }
      }
    }

  In which:

  • path is a string specifying the path within the relevant asset src folder of the asset to be copied.
  • dest is a string specifying that destination folder for the asset to be copied to, within the relevant asset dist folder.
  • revision is a boolean such that if it is true, the asset will be revision hashed when copied to its destination.

  path and dest must always be defined for each asset you wish to copy (except for copy:docs which uses the root docsDist path for the dest).

  The object key (which in the above example is prism) of each asset is simply for your own use to identify each asset in your config.

• copy:assets

  Copies assets from packages to the dist directory.

docs

• rootDir

  Type: string

  Default: './docs'

  Root directory where your documentation files reside.

  By default your source files will be searched for in docs/src, and the generated content will be output to docs/dist.

• srcDir

  Type: string

  Default: 'src'

  The source directory for your documentation template files.

  By default the documentation task will use the path docs/src – with the src part of this path controlled by this config variable.

• distDir

  Type: string

  Default: 'dist'

  The directory your documentation will be compiled to.

  By default the documentation task will use docs/dist – with the dist part of this path controlled by this config variable.

• assetDir

  Type: string

  Default: 'assets/'

  The directory your generated assets will be placed inside the documentation directory.

  By default the documentation task will use docs/dist/assets/ – with the assets/ part of this path controlled by this config variable.

• templDir

  Type: string

  Default: 'templates'

  The name of the directory where your documentation template files are kept.

• dataDir

  Type: string

  Default: 'data'

  The name of the directory where your documentation data files are kept.

• outputAssets

  Type: boolean

  Default: false

  Indicates whether or not the JavaScript, CSS and image files should be placed into the docs/dist/assets/ directory.

• remoteBase

  Type: string

  Default: ''

  Applies a base path to asset URLs when publishing documentation to Github pages. By default this is set to be an empty string.

• helpers

  Type: object

  Default: {}

  Can pass in an object set of functions, which will be exposed in handlebars as helper functions in the documentation tasks when called using their object key.

  For example:

  {
    'toLowercase': input => input.toLowerCase()
  }

  Will expose the helper toLowercase so that using {{toLowercase name}} within a handlebars template will convert the handlebars string name to lowercase.

• excludeTemplateDirs

  Type: array

  Default: ['resources']

  Directory names which should be ignored when adding any shared templates to the documentation. By default the array contains known directory names which should be ignored.

fonts

• fontsDir

  Type: string

  Default: 'fonts'

  Name of the directory where your font files are kept.

browserSync

• files

  Type: array

  Default: []

  List of paths to watch for changes. Accepts globs.

• proxy

  Type: string

  Default: ''

  URL of local website instance.

• reloadDebounce

  Type: number

  Default: 1000

  Wait for a specified window of event-silence (in milliseconds) before sending any reload events.

misc

• showFileSize

  Type: boolean

  Default: true

  Should file sizes be displayed when a task is run?

• showFiles

  Type: boolean

  Default: true

  Should file names be displayed when a task is run?

gulp

• changeEvent

  Type: function

  Event which fires when a file is modified.

• onError

  Type: function

  Event which fires when an error occurs.

Other config

The following options are also present in the config but cannot be overridden.

• isProduction

  Type: boolean

  Set to true when the --prod flag is passed.

• isDev

  Type: boolean

  Set to the opposite value of isProduction.

• lintModules

  Type: boolean

  When set to true, by setting the --lintModules flag when running the build, the build will also lint SCSS files within sub-dependencies. This is intended to help with local development when using dependency linking.

Path Builder

You can access the pathBuilder paths like this.

const { pathBuilder } = require('@justeat/gulp-build-fozzie');

gulp.task('scss', () => gulp.src(`${pathBuilder.scssSrcDir}/**`)

…

These are the paths which the pathBuilder object provides.

CSS

• scssSrcDir

  Default: 'src/scss'

• cssDistDir

  Default: 'dist/css'

• jsSrcDir

  Default: 'src/js'

• jsDistDir

  Default: 'dist/js'

• imgSrcDir

  Default: 'src/img'

• imgDistDir

  Default: 'dist/img'

• importedAssetsDistDir

  Default: 'dist/imported-assets'

• swOutputPath

  Default: '.'

• swSrcDir

  Default: 'src/sw'

• swDistDir

  Default: 'dist/sw'

• docsSrcDir

  Default: './docs/src'

• docsDistDir

  Default: './docs/dist'

• docsTemplateDir

  Default: './docs/src/templates'

• docsDataDir

  Default: './docs/src/data'

• docsAssetsDistDir

  Default: './docs/dist/assets/'

• docsCssDistDir

  Default: './docs/dist/assets/css'

• docsJsDistDir

  Default: './docs/dist/assets/js'

• docsImgDistDir

  Default: './docs/dist/assets/img'

• fontsSrcDir

  Default: 'src/fonts'

• fontsDistDir

  Default: 'dist/fonts'

Running the unit tests

To run the unit tests for the project run the yarn test script. To see the test coverage run the test:cover script.