127 lines
6.2 KiB
JavaScript
127 lines
6.2 KiB
JavaScript
"use strict";
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var _definerule = require("../utils/define-rule");
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var _nodeattributes = /*#__PURE__*/ _interop_require_default(require("../utils/node-attributes"));
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var _path = require("path");
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function _interop_require_default(obj) {
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return obj && obj.__esModule ? obj : {
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default: obj
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};
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}
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var url = "https://nextjs.org/docs/messages/no-page-custom-font";
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function isIdentifierMatch(id1, id2) {
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return id1 === null && id2 === null || id1 && id2 && id1.name === id2.name;
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}
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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 page-only custom fonts.",
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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 paths = context.getFilename().split("pages");
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var page = paths[paths.length - 1];
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// outside of a file within `pages`, bail
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if (!page) {
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return {};
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}
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var is_Document = page.startsWith("".concat(_path.sep, "_document")) || page.startsWith("".concat(_path.posix.sep, "_document"));
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var documentImportName;
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var localDefaultExportId;
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var exportDeclarationType;
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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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ExportDefaultDeclaration: function ExportDefaultDeclaration(node) {
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exportDeclarationType = node.declaration.type;
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if (node.declaration.type === "FunctionDeclaration") {
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localDefaultExportId = node.declaration.id;
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return;
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}
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if (node.declaration.type === "ClassDeclaration" && node.declaration.superClass && "name" in node.declaration.superClass && node.declaration.superClass.name === documentImportName) {
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localDefaultExportId = node.declaration.id;
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}
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},
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JSXOpeningElement: function JSXOpeningElement(node) {
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if (node.name.name !== "link") {
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return;
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}
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var ancestors = context.getAncestors();
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// if `export default <name>` is further down within the file after the
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// currently traversed component, then `localDefaultExportName` will
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// still be undefined
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if (!localDefaultExportId) {
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// find the top level of the module
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var program = ancestors.find(function(ancestor) {
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return ancestor.type === "Program";
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});
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// go over each token to find the combination of `export default <name>`
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for(var i = 0; i <= program.tokens.length - 1; i++){
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if (localDefaultExportId) {
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break;
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}
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var token = program.tokens[i];
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if (token.type === "Keyword" && token.value === "export") {
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var nextToken = program.tokens[i + 1];
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if (nextToken && nextToken.type === "Keyword" && nextToken.value === "default") {
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var maybeIdentifier = program.tokens[i + 2];
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if (maybeIdentifier && maybeIdentifier.type === "Identifier") {
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localDefaultExportId = {
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name: maybeIdentifier.value
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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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var parentComponent = ancestors.find(function(ancestor) {
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// export default class ... extends ...
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if (exportDeclarationType === "ClassDeclaration") {
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return ancestor.type === exportDeclarationType && "superClass" in ancestor && ancestor.superClass && "name" in ancestor.superClass && ancestor.superClass.name === documentImportName;
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}
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if ("id" in ancestor) {
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// export default function ...
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if (exportDeclarationType === "FunctionDeclaration") {
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return ancestor.type === exportDeclarationType && isIdentifierMatch(ancestor.id, localDefaultExportId);
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}
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// function ...() {} export default ...
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// class ... extends ...; export default ...
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return isIdentifierMatch(ancestor.id, localDefaultExportId);
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}
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return false;
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});
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// file starts with _document and this <link /> is within the default export
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if (is_Document && parentComponent) {
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return;
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}
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var attributes = new _nodeattributes.default(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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var hrefValue = attributes.value("href");
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var isGoogleFont = typeof hrefValue === "string" && hrefValue.startsWith("https://fonts.googleapis.com/css");
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if (isGoogleFont) {
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var end = "This is discouraged. See: ".concat(url);
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var message = is_Document ? "Using `<link />` outside of `<Head>` will disable automatic font optimization. ".concat(end) : "Custom fonts not added in `pages/_document.js` will only load for a single page. ".concat(end);
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context.report({
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node: node,
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message: message
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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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