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no-sync-scripts.js
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no-sync-scripts.js
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const url = 'https://nextjs.org/docs/messages/no-sync-scripts'
module.exports = {
meta: {
docs: {
description: 'Prevent synchronous scripts.',
recommended: true,
url,
},
type: 'problem',
schema: [],
},
create: function (context) {
return {
JSXOpeningElement(node) {
if (node.name.name !== 'script') {
return
}
if (node.attributes.length === 0) {
return
}
const attributeNames = node.attributes
.filter((attr) => attr.type === 'JSXAttribute')
.map((attr) => attr.name.name)
if (
attributeNames.includes('src') &&
!attributeNames.includes('async') &&
!attributeNames.includes('defer')
) {
context.report({
node,
message: `Synchronous scripts should not be used. See: ${url}`,
})
}
},
}
},
}