57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
const NodeAttributes = require('../utils/node-attributes.js')
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module.exports = {
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meta: {
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docs: {
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description:
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'Ensure correct font-display property is assigned for Google Fonts',
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recommended: true,
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url: 'https://nextjs.org/docs/messages/google-font-display',
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},
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},
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create: function (context) {
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return {
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JSXOpeningElement(node) {
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let message
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if (node.name.name !== 'link') {
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return
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}
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const attributes = new NodeAttributes(node)
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if (!attributes.has('href') || !attributes.hasValue('href')) {
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return
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}
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const hrefValue = attributes.value('href')
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const isGoogleFont =
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typeof hrefValue === 'string' &&
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hrefValue.startsWith('https://fonts.googleapis.com/css')
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if (isGoogleFont) {
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const params = new URLSearchParams(hrefValue.split('?')[1])
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const displayValue = params.get('display')
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if (!params.has('display')) {
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message = 'Display parameter is missing.'
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} else if (
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displayValue === 'block' ||
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displayValue === 'fallback' ||
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displayValue === 'auto'
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) {
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message = `${
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displayValue[0].toUpperCase() + displayValue.slice(1)
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} behavior is not recommended.`
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}
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}
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if (message) {
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context.report({
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node,
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message: `${message} See https://nextjs.org/docs/messages/google-font-display.`,
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})
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}
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},
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}
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},
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}
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