70 lines
1.7 KiB
JavaScript
70 lines
1.7 KiB
JavaScript
const outdent = require('outdent')
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const Image = require('@11ty/eleventy-img')
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const img = async (
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src,
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alt,
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className = undefined,
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loading = 'lazy',
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widths = [75, 150, 300, 600, 900, 1200],
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formats = ['webp', 'jpeg'],
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sizes = '100vw'
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) => {
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const imageMetadata = await Image(src, {
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widths: [...widths, null],
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formats: [...formats, null],
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outputDir: './_site/assets/img/cache/',
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urlPath: '/assets/img/cache/',
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})
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const stringifyAttributes = (attributeMap) => {
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return Object.entries(attributeMap)
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.map(([attribute, value]) => {
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if (typeof value === 'undefined') return ''
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return `${attribute}="${value}"`
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})
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.join(' ')
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}
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const sourceHtmlString = Object.values(imageMetadata)
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.map((images) => {
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const { sourceType } = images[0]
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const sourceAttributes = stringifyAttributes({
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type: sourceType,
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srcset: images.map((image) => image.srcset).join(', '),
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sizes,
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})
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return `<source ${sourceAttributes}>`
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})
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.join('\n')
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const getLargestImage = (format) => {
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const images = imageMetadata[format]
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return images[images.length - 1]
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}
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const largestUnoptimizedImg = getLargestImage(formats[0])
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const imgAttributes = stringifyAttributes({
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src: largestUnoptimizedImg.url,
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width: largestUnoptimizedImg.width,
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height: largestUnoptimizedImg.height,
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alt,
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loading,
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decoding: 'async',
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})
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const imgHtmlString = `<img ${imgAttributes}>`
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const pictureAttributes = stringifyAttributes({
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class: className,
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})
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const picture = `<picture ${pictureAttributes}>
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${sourceHtmlString}
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${imgHtmlString}
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</picture>`
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return outdent`${picture}`
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}
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module.exports = img
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