@aimee.gm/responsive

Auto generate multiple resized images for responsive use with a simple CLI command. Also comes with a CLI tool to verify images have been resized (useful for CI) and handy methods for creating eleventy shortcodes.

• @aimee.gm/responsive
  • Installation
  • Usage
    • Configuration
    • Resize images
    • Check resized images
    • shortcode()
    • responsiveImages()
  • Configuration
    • File format
    • Options
      • srcDir
      • outDir
      • sizes
      • ext
      • srcRewrite
      • defaultSize

Installation

yarn add @aimee.gm/responsive

Usage

Configuration

Create a .responsiverc.yml file in the root of your project.

Example:

srcDir: site/assets/images/originals
outDir: site/assets/images/photos
srcRewrite: assets/images/photos
sizes:
  - 400
  - 800

See Configuration for a detailed description.

Resize images

Run yarn resize-images or npx resize-images. Resizes images found in srcDir and outputs them, reamed to outDir in sizes.

Check resized images

Run yarn verify-resized-images or npx verify-resized-images. Verifies images found in srcDir have been correctly resized and reamed to outDir in sizes. Useful for CI.

shortcode()

shortcode(sizes: string[]): (src: string, alt: string, options: { class?: string } = {}) => string

Returns an function that can be used as an eleventy shortcode. Accepts the following arguments:

• src: string (required) the path to the un-resized image file. The URL path will be modified using the srcRewrite configuration option.
• alt: string (required) the alt text for the image
• options: object (optional)
  • class (optional) class to apply to the generated image element.

Example:

const { shortcode } = require("@aimee.gm/responsive");

module.exports = function (eleventyConfig) {
  eleventyConfig.addShortcode(
    "responsive",
    shortcode([
      "(min-width: 1025px) 864px",
      "(min-width: 768px) 736px",
      "(min-width: 645px) 608px",
      "100vw",
    ])
  );
};

And use with nunjucks:

{% responsive image.url, image.alt, { class: "my-custom-class" } %}

responsiveImages()

responsiveImages(filepath: string): { src: string, srcset: string }

Returns an object with src and srcset attributes for a responsive <img> tag. filepath should be the path to the original image, relative to your project root. The src will be modified using the srcRewrite configuration option. Suitable for more control over how markup is rendered.

Example:

const { responsiveImages } = require("@aimee.gm/responsive");

module.exports = function (eleventyConfig) {
  eleventyConfig.addShortcode("responsive", (filepath, alt) => {
    const { src, srcset } = responsiveImages(filepath);
    return `<img src="${src}" srcset="${srcset}" sizes="100vw" alt="${alt}">`;
  });
};

Configuration

File format

The confiruration file can be one of:

• .responsiverc (json)
• .responsiverc.json
• .responsiverc.yaml

Options

srcDir

Location of original images to resize, relative path from configuration file. Search is recursive.

outDir

Location of folder to save resized images, relative path from configuration file.

sizes

Array of sizes to resize to. Defaults to [400, 800, 1600]

ext

Array of file extensions to match for files to resize. Defaults to ["jpg", "jpeg", "png"]

srcRewrite

Path to use for <img> when using responsiveImages() to resolve a full-size image path to the resized files. Defaults to outDir

defaultSize

Default size to use for creating the src attribute with responsiveImages() and shortcode(). Defaults to the largest resized image.