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| import { Suspense, Fragment, lazy } from 'react' | |
| import { BailoutToCSR } from './dynamic-bailout-to-csr' | |
| import type { ComponentModule } from './types' | |
| import { PreloadChunks } from './preload-chunks' | |
| // Normalize loader to return the module as form { default: Component } for `React.lazy`. | |
| // Also for backward compatible since next/dynamic allows to resolve a component directly with loader | |
| // Client component reference proxy need to be converted to a module. | |
| function convertModule<P>( | |
| mod: React.ComponentType<P> | ComponentModule<P> | undefined | |
| ): { | |
| default: React.ComponentType<P> | |
| } { | |
| // Check "default" prop before accessing it, as it could be client reference proxy that could break it reference. | |
| // Cases: | |
| // mod: { default: Component } | |
| // mod: Component | |
| // mod: { default: proxy(Component) } | |
| // mod: proxy(Component) | |
| const hasDefault = mod && 'default' in mod | |
| return { | |
| default: hasDefault | |
| ? (mod as ComponentModule<P>).default | |
| : (mod as React.ComponentType<P>), | |
| } | |
| } | |
| const defaultOptions = { | |
| loader: () => Promise.resolve(convertModule(() => null)), | |
| loading: null, | |
| ssr: true, | |
| } | |
| interface LoadableOptions { | |
| loader?: () => Promise<React.ComponentType<any> | ComponentModule<any>> | |
| loading?: React.ComponentType<any> | null | |
| ssr?: boolean | |
| modules?: string[] | |
| } | |
| function Loadable(options: LoadableOptions) { | |
| const opts = { ...defaultOptions, ...options } | |
| const Lazy = lazy(() => opts.loader().then(convertModule)) | |
| const Loading = opts.loading | |
| function LoadableComponent(props: any) { | |
| const fallbackElement = Loading ? ( | |
| <Loading isLoading={true} pastDelay={true} error={null} /> | |
| ) : null | |
| // If it's non-SSR or provided a loading component, wrap it in a suspense boundary | |
| const hasSuspenseBoundary = !opts.ssr || !!opts.loading | |
| const Wrap = hasSuspenseBoundary ? Suspense : Fragment | |
| const wrapProps = hasSuspenseBoundary ? { fallback: fallbackElement } : {} | |
| const children = opts.ssr ? ( | |
| <> | |
| {/* During SSR, we need to preload the CSS from the dynamic component to avoid flash of unstyled content */} | |
| {typeof window === 'undefined' ? ( | |
| <PreloadChunks moduleIds={opts.modules} /> | |
| ) : null} | |
| <Lazy {...props} /> | |
| </> | |
| ) : ( | |
| <BailoutToCSR reason="next/dynamic"> | |
| <Lazy {...props} /> | |
| </BailoutToCSR> | |
| ) | |
| return <Wrap {...wrapProps}>{children}</Wrap> | |
| } | |
| LoadableComponent.displayName = 'LoadableComponent' | |
| return LoadableComponent | |
| } | |
| export default Loadable | |