fc7e235f2c
* Add checking for hybrid AMP during static check * Update to always hit server for prerender data * Add removing of SPR code when not used * Add checking for hybrid AMP during static check * Update to always hit server for prerender data * Add removing of SPR code when not used * Update dead code elimination
132 lines
4 KiB
TypeScript
132 lines
4 KiB
TypeScript
import { PluginObj } from '@babel/core'
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import { NodePath } from '@babel/traverse'
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import * as BabelTypes from '@babel/types'
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import { PageConfig } from 'next-server/types'
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export const dropBundleIdentifier = '__NEXT_DROP_CLIENT_FILE__'
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export const sprStatus = { used: false }
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const configKeys = new Set(['amp', 'experimentalPrerender'])
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const pageComponentVar = '__NEXT_COMP'
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// this value can't be optimized by terser so the shorter the better
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const prerenderId = '__NEXT_SPR'
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// replace program path with just a variable with the drop identifier
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function replaceBundle(path: any, t: typeof BabelTypes) {
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path.parentPath.replaceWith(
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t.program(
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[
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t.variableDeclaration('const', [
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t.variableDeclarator(
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t.identifier('config'),
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t.assignmentExpression(
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'=',
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t.identifier(dropBundleIdentifier),
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t.stringLiteral(`${dropBundleIdentifier} ${Date.now()}`)
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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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interface ConfigState {
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isPrerender?: boolean
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bundleDropped?: boolean
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}
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export default function nextPageConfig({
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types: t,
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}: {
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types: typeof BabelTypes
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}): PluginObj {
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return {
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visitor: {
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Program: {
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enter(path, state: ConfigState) {
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path.traverse(
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{
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ExportNamedDeclaration(
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path: NodePath<BabelTypes.ExportNamedDeclaration>,
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state: any
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) {
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if (
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state.bundleDropped ||
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!path.node.declaration ||
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!(path.node.declaration as any).declarations
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)
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return
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const { declarations } = path.node.declaration as any
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const config: PageConfig = {}
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for (const declaration of declarations) {
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if (declaration.id.name !== 'config') continue
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if (declaration.init.type !== 'ObjectExpression') {
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const pageName =
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(state.filename || '').split(state.cwd || '').pop() ||
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'unknown'
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throw new Error(
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`Invalid page config export found. Expected object but got ${
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declaration.init.type
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} in file ${pageName}. See: https://err.sh/zeit/next.js/invalid-page-config`
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)
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}
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for (const prop of declaration.init.properties) {
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const { name } = prop.key
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if (configKeys.has(name)) {
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// @ts-ignore
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config[name] = prop.value.value
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}
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}
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}
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if (config.amp === true) {
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replaceBundle(path, t)
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state.bundleDropped = true
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return
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}
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state.isPrerender = config.experimentalPrerender === true
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sprStatus.used = sprStatus.used || state.isPrerender
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},
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},
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state
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)
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},
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},
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ExportDefaultDeclaration(path, state: ConfigState) {
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if (!state.isPrerender) {
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return
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}
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const prev = t.cloneDeep(path.node.declaration)
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// workaround to allow assigning a ClassDeclaration to a variable
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// babel throws error without
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if (prev.type.endsWith('Declaration')) {
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prev.type = prev.type.replace(/Declaration$/, 'Expression') as any
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}
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path.insertBefore([
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t.variableDeclaration('const', [
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t.variableDeclarator(t.identifier(pageComponentVar), prev as any),
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]),
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t.assignmentExpression(
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'=',
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t.memberExpression(
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t.identifier(pageComponentVar),
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t.identifier(prerenderId)
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),
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t.booleanLiteral(true)
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),
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])
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path.node.declaration = t.identifier(pageComponentVar)
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},
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},
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}
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}
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