novarix.uk/node_modules/@next/eslint-plugin-next/dist/rules/no-page-custom-font.js

"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
Object.defineProperty(exports, "default", {
    enumerable: true,
    get: function() {
        return _default;
    }
});
var _definerule = require("../utils/define-rule");
var _nodeattributes = /*#__PURE__*/ _interop_require_default(require("../utils/node-attributes"));
var _path = require("path");
function _interop_require_default(obj) {
    return obj && obj.__esModule ? obj : {
        default: obj
    };
}
var url = 'https://nextjs.org/docs/messages/no-page-custom-font';
function isIdentifierMatch(id1, id2) {
    return id1 === null && id2 === null || id1 && id2 && id1.name === id2.name;
}
var _default = (0, _definerule.defineRule)({
    meta: {
        docs: {
            description: 'Prevent page-only custom fonts.',
            recommended: true,
            url: url
        },
        type: 'problem',
        schema: []
    },
    create: function create(context) {
        var sourceCode = context.sourceCode;
        var paths = context.filename.split('pages');
        var page = paths[paths.length - 1];
        // outside of a file within `pages`, bail
        if (!page) {
            return {};
        }
        var is_Document = page.startsWith("".concat(_path.sep, "_document")) || page.startsWith("".concat(_path.posix.sep, "_document"));
        var documentImportName;
        var localDefaultExportId;
        var exportDeclarationType;
        return {
            ImportDeclaration: function ImportDeclaration(node) {
                if (node.source.value === 'next/document') {
                    var documentImport = node.specifiers.find(function(param) {
                        var type = param.type;
                        return type === 'ImportDefaultSpecifier';
                    });
                    if (documentImport && documentImport.local) {
                        documentImportName = documentImport.local.name;
                    }
                }
            },
            ExportDefaultDeclaration: function ExportDefaultDeclaration(node) {
                exportDeclarationType = node.declaration.type;
                if (node.declaration.type === 'FunctionDeclaration') {
                    localDefaultExportId = node.declaration.id;
                    return;
                }
                if (node.declaration.type === 'ClassDeclaration' && node.declaration.superClass && 'name' in node.declaration.superClass && node.declaration.superClass.name === documentImportName) {
                    localDefaultExportId = node.declaration.id;
                }
            },
            JSXOpeningElement: function JSXOpeningElement(node) {
                if (node.name.name !== 'link') {
                    return;
                }
                var ancestors = sourceCode.getAncestors(node);
                // if `export default <name>` is further down within the file after the
                // currently traversed component, then `localDefaultExportName` will
                // still be undefined
                if (!localDefaultExportId) {
                    // find the top level of the module
                    var program = ancestors.find(function(ancestor) {
                        return ancestor.type === 'Program';
                    });
                    // go over each token to find the combination of `export default <name>`
                    for(var i = 0; i <= program.tokens.length - 1; i++){
                        if (localDefaultExportId) {
                            break;
                        }
                        var token = program.tokens[i];
                        if (token.type === 'Keyword' && token.value === 'export') {
                            var nextToken = program.tokens[i + 1];
                            if (nextToken && nextToken.type === 'Keyword' && nextToken.value === 'default') {
                                var maybeIdentifier = program.tokens[i + 2];
                                if (maybeIdentifier && maybeIdentifier.type === 'Identifier') {
                                    localDefaultExportId = {
                                        name: maybeIdentifier.value
                                    };
                                }
                            }
                        }
                    }
                }
                var parentComponent = ancestors.find(function(ancestor) {
                    // export default class ... extends ...
                    if (exportDeclarationType === 'ClassDeclaration') {
                        return ancestor.type === exportDeclarationType && 'superClass' in ancestor && ancestor.superClass && 'name' in ancestor.superClass && ancestor.superClass.name === documentImportName;
                    }
                    if ('id' in ancestor) {
                        // export default function ...
                        if (exportDeclarationType === 'FunctionDeclaration') {
                            return ancestor.type === exportDeclarationType && isIdentifierMatch(ancestor.id, localDefaultExportId);
                        }
                        // function ...() {} export default ...
                        // class ... extends ...; export default ...
                        return isIdentifierMatch(ancestor.id, localDefaultExportId);
                    }
                    return false;
                });
                // file starts with _document and this <link /> is within the default export
                if (is_Document && parentComponent) {
                    return;
                }
                var attributes = new _nodeattributes.default(node);
                if (!attributes.has('href') || !attributes.hasValue('href')) {
                    return;
                }
                var hrefValue = attributes.value('href');
                var isGoogleFont = typeof hrefValue === 'string' && hrefValue.startsWith('https://fonts.googleapis.com/css');
                if (isGoogleFont) {
                    var end = "This is discouraged. See: ".concat(url);
                    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);
                    context.report({
                        node: node,
                        message: message
                    });
                }
            }
        };
    }
});