55 lines
2.5 KiB
JavaScript
55 lines
2.5 KiB
JavaScript
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"use strict";
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var _definerule = require("../utils/define-rule");
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var url = "https://nextjs.org/docs/messages/no-duplicate-head";
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module.exports = (0, _definerule.defineRule)({
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meta: {
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docs: {
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description: "Prevent duplicate usage of `<Head>` in `pages/_document.js`.",
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recommended: true,
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url: url
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},
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type: "problem",
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schema: []
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},
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create: function create(context) {
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var documentImportName;
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return {
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ImportDeclaration: function ImportDeclaration(node) {
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if (node.source.value === "next/document") {
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var documentImport = node.specifiers.find(function(param) {
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var type = param.type;
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return 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: function ReturnStatement(node) {
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var ancestors = context.getAncestors();
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var documentClass = ancestors.find(function(ancestorNode) {
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return ancestorNode.type === "ClassDeclaration" && ancestorNode.superClass && "name" in ancestorNode.superClass && 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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// @ts-expect-error - `node.argument` could be a `JSXElement` which has property `children`
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if (node.argument && "children" in node.argument && node.argument.children) {
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// @ts-expect-error - `node.argument` could be a `JSXElement` which has property `children`
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var headComponents = node.argument.children.filter(function(childrenNode) {
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return childrenNode.openingElement && childrenNode.openingElement.name && childrenNode.openingElement.name.name === "Head";
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});
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if (headComponents.length > 1) {
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for(var i = 1; i < headComponents.length; i++){
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context.report({
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node: headComponents[i],
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message: "Do not include multiple instances of `<Head/>`. See: ".concat(url)
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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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