155 lines
4.8 KiB
JavaScript
155 lines
4.8 KiB
JavaScript
const NodeAttributes = require('../utils/node-attributes.js')
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const { sep, posix } = require('path')
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module.exports = {
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meta: {
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docs: {
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description:
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'Recommend adding custom font in a custom document and not in a specific page',
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recommended: true,
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url: 'https://nextjs.org/docs/messages/no-page-custom-font',
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},
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},
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create: function (context) {
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const paths = context.getFilename().split('pages')
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const 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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const is_Document =
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page.startsWith(`${sep}_document`) ||
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page.startsWith(`${posix.sep}_document`)
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let documentImportName
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let localDefaultExportName
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let exportDeclarationType
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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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ExportDefaultDeclaration(node) {
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exportDeclarationType = node.declaration.type
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if (node.declaration.type === 'FunctionDeclaration') {
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localDefaultExportName = node.declaration.id.name
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return
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}
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if (
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node.declaration.type === 'ClassDeclaration' &&
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node.declaration.superClass &&
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node.declaration.superClass.name === documentImportName
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) {
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localDefaultExportName = node.declaration.id.name
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}
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},
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JSXOpeningElement(node) {
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if (node.name.name !== 'link') {
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return
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}
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const 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 (!localDefaultExportName) {
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// find the top level of the module
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const program = ancestors.find(
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(ancestor) => 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 (let i = 0; i <= program.tokens.length - 1; i++) {
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if (localDefaultExportName) {
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break
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}
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const token = program.tokens[i]
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if (token.type === 'Keyword' && token.value === 'export') {
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const nextToken = program.tokens[i + 1]
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if (
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nextToken &&
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nextToken.type === 'Keyword' &&
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nextToken.value === 'default'
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) {
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const maybeIdentifier = program.tokens[i + 2]
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if (maybeIdentifier && maybeIdentifier.type === 'Identifier') {
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localDefaultExportName = 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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const parentComponent = ancestors.find((ancestor) => {
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// export default class ... extends ...
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if (exportDeclarationType === 'ClassDeclaration') {
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return (
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ancestor.type === exportDeclarationType &&
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ancestor.superClass &&
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ancestor.superClass.name === documentImportName
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)
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}
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// export default function ...
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if (exportDeclarationType === 'FunctionDeclaration') {
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return (
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ancestor.type === exportDeclarationType &&
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ancestor.id.name === localDefaultExportName
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)
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}
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// function ...() {} export default ...
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// class ... extends ...; export default ...
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return ancestor.id && ancestor.id.name === localDefaultExportName
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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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const attributes = new NodeAttributes(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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const hrefValue = attributes.value('href')
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const isGoogleFont =
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typeof hrefValue === 'string' &&
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hrefValue.startsWith('https://fonts.googleapis.com/css')
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if (isGoogleFont) {
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const end =
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'This is discouraged. See https://nextjs.org/docs/messages/no-page-custom-font.'
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const message = is_Document
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? `Rendering this <link /> not inline within <Head> of Document disables font optimization. ${end}`
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: `Custom fonts not added at the document level will only load for a single page. ${end}`
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context.report({
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node,
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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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