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page-meta.ts
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page-meta.ts
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import { pathToFileURL } from 'node:url'
import { createUnplugin } from 'unplugin'
import { parseQuery, parseURL, stringifyQuery } from 'ufo'
import { findStaticImports, findExports, StaticImport, parseStaticImport } from 'mlly'
import type { CallExpression, Identifier, Expression } from 'estree'
import { walk } from 'estree-walker'
import MagicString from 'magic-string'
import { isAbsolute, normalize } from 'pathe'
export interface PageMetaPluginOptions {
dirs: Array<string | RegExp>
dev?: boolean
sourcemap?: boolean
}
const CODE_EMPTY = `
const __nuxt_page_meta = {}
export default __nuxt_page_meta
`
const CODE_HMR = `
// Vite
if (import.meta.hot) {
import.meta.hot.accept(mod => {
Object.assign(__nuxt_page_meta, mod)
})
}
// Webpack
if (import.meta.webpackHot) {
import.meta.webpackHot.accept((err) => {
if (err) { window.location = window.location.href }
})
}`
export const PageMetaPlugin = createUnplugin((options: PageMetaPluginOptions) => {
return {
name: 'nuxt:pages-macros-transform',
enforce: 'post',
transformInclude (id) {
const query = parseMacroQuery(id)
id = normalize(id)
const isPagesDir = options.dirs.some(dir => typeof dir === 'string' ? id.startsWith(dir) : dir.test(id))
if (!isPagesDir && !query.macro) { return false }
const { pathname } = parseURL(decodeURIComponent(pathToFileURL(id).href))
return /\.(m?[jt]sx?|vue)/.test(pathname)
},
transform (code, id) {
const query = parseMacroQuery(id)
if (query.type && query.type !== 'script') { return }
const s = new MagicString(code)
function result () {
if (s.hasChanged()) {
return {
code: s.toString(),
map: options.sourcemap
? s.generateMap({ source: id, includeContent: true })
: undefined
}
}
}
const hasMacro = code.match(/\bdefinePageMeta\s*\(\s*/)
// Remove any references to the macro from our pages
if (!query.macro) {
if (hasMacro) {
walk(this.parse(code, {
sourceType: 'module',
ecmaVersion: 'latest'
}), {
enter (_node) {
if (_node.type !== 'CallExpression' || (_node as CallExpression).callee.type !== 'Identifier') { return }
const node = _node as CallExpression & { start: number, end: number }
const name = 'name' in node.callee && node.callee.name
if (name === 'definePageMeta') {
s.overwrite(node.start, node.end, 'false && {}')
}
}
})
}
return result()
}
const imports = findStaticImports(code)
// [vite] Re-export any script imports
const scriptImport = imports.find(i => parseMacroQuery(i.specifier).type === 'script')
if (scriptImport) {
const specifier = rewriteQuery(scriptImport.specifier)
s.overwrite(0, code.length, `export { default } from ${JSON.stringify(specifier)}`)
return result()
}
// [webpack] Re-export any exports from script blocks in the components
const currentExports = findExports(code)
for (const match of currentExports) {
if (match.type !== 'default' || !match.specifier) {
continue
}
const specifier = rewriteQuery(match.specifier)
s.overwrite(0, code.length, `export { default } from ${JSON.stringify(specifier)}`)
return result()
}
if (!hasMacro && !code.includes('export { default }') && !code.includes('__nuxt_page_meta')) {
s.overwrite(0, code.length, CODE_EMPTY + (options.dev ? CODE_HMR : ''))
return result()
}
const importMap = new Map<string, StaticImport>()
const addedImports = new Set()
for (const i of imports) {
const parsed = parseStaticImport(i)
for (const name of [
parsed.defaultImport,
...Object.keys(parsed.namedImports || {}),
parsed.namespacedImport
].filter(Boolean) as string[]) {
importMap.set(name, i)
}
}
walk(this.parse(code, {
sourceType: 'module',
ecmaVersion: 'latest'
}), {
enter (_node) {
if (_node.type !== 'CallExpression' || (_node as CallExpression).callee.type !== 'Identifier') { return }
const node = _node as CallExpression & { start: number, end: number }
const name = 'name' in node.callee && node.callee.name
if (name !== 'definePageMeta') { return }
const meta = node.arguments[0] as Expression & { start: number, end: number }
let contents = `const __nuxt_page_meta = ${code!.slice(meta.start, meta.end) || '{}'}\nexport default __nuxt_page_meta` + (options.dev ? CODE_HMR : '')
function addImport (name: string | false) {
if (name && importMap.has(name)) {
const importValue = importMap.get(name)!.code
if (!addedImports.has(importValue)) {
contents = importMap.get(name)!.code + '\n' + contents
addedImports.add(importValue)
}
}
}
walk(meta, {
enter (_node) {
if (_node.type === 'CallExpression') {
const node = _node as CallExpression & { start: number, end: number }
addImport('name' in node.callee && node.callee.name)
}
if (_node.type === 'Identifier') {
const node = _node as Identifier & { start: number, end: number }
addImport(node.name)
}
}
})
s.overwrite(0, code.length, contents)
}
})
if (!s.hasChanged() && !code.includes('__nuxt_page_meta')) {
s.overwrite(0, code.length, CODE_EMPTY + (options.dev ? CODE_HMR : ''))
}
return result()
},
vite: {
handleHotUpdate: {
order: 'pre',
handler: ({ modules }) => {
// Remove macro file from modules list to prevent HMR overrides
const index = modules.findIndex(i => i.id?.includes('?macro=true'))
if (index !== -1) {
modules.splice(index, 1)
}
}
}
}
}
})
// https://github.com/vuejs/vue-loader/pull/1911
// https://github.com/vitejs/vite/issues/8473
function rewriteQuery (id: string) {
const query = stringifyQuery({ macro: 'true', ...parseMacroQuery(id) })
return id.replace(/\?.+$/, '?' + query)
}
function parseMacroQuery (id: string) {
const { search } = parseURL(decodeURIComponent(isAbsolute(id) ? pathToFileURL(id).href : id).replace(/\?macro=true$/, ''))
const query = parseQuery(search)
if (id.includes('?macro=true')) {
return { macro: 'true', ...query }
}
return query
}