56 lines
1.7 KiB
JavaScript
56 lines
1.7 KiB
JavaScript
module.exports = {
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meta: {
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docs: {
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description: 'Enforce no duplicate usage of <Head> in pages/document.js',
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recommended: true,
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url: 'https://nextjs.org/docs/messages/no-duplicate-head',
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},
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},
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create: function (context) {
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let documentImportName
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return {
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ImportDeclaration(node) {
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if (node.source.value === 'next/document') {
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const documentImport = node.specifiers.find(
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({ type }) => type === 'ImportDefaultSpecifier'
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)
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if (documentImport && documentImport.local) {
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documentImportName = documentImport.local.name
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}
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}
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},
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ReturnStatement(node) {
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const ancestors = context.getAncestors()
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const documentClass = ancestors.find(
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(ancestorNode) =>
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ancestorNode.type === 'ClassDeclaration' &&
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ancestorNode.superClass &&
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ancestorNode.superClass.name === documentImportName
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)
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if (!documentClass) {
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return
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}
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if (node.argument && node.argument.children) {
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const headComponents = node.argument.children.filter(
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(childrenNode) =>
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childrenNode.openingElement &&
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childrenNode.openingElement.name &&
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childrenNode.openingElement.name.name === 'Head'
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)
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if (headComponents.length > 1) {
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for (let i = 1; i < headComponents.length; i++) {
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context.report({
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node: headComponents[i],
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message:
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'Do not include multiple instances of <Head/>. See: https://nextjs.org/docs/messages/no-duplicate-head',
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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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},
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}
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