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dynamic.tsx
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dynamic.tsx
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import React from 'react'
import Loadable from './loadable'
const isServerSide = typeof window === 'undefined'
export type LoaderComponent<P = {}> = Promise<
React.ComponentType<P> | { default: React.ComponentType<P> }
>
export type Loader<P = {}> = (() => LoaderComponent<P>) | LoaderComponent<P>
export type LoaderMap = { [mdule: string]: () => Loader<any> }
export type LoadableGeneratedOptions = {
webpack?(): any
modules?(): LoaderMap
}
export type LoadableBaseOptions<P = {}> = LoadableGeneratedOptions & {
loading?: ({
error,
isLoading,
pastDelay,
}: {
error?: Error | null
isLoading?: boolean
pastDelay?: boolean
retry?: () => void
timedOut?: boolean
}) => JSX.Element | null
loader?: Loader<P> | LoaderMap
loadableGenerated?: LoadableGeneratedOptions
ssr?: boolean
}
export type LoadableSuspenseOptions = {
suspense?: boolean
}
export type LoadableOptions<P = {}> = LoadableBaseOptions<P>
export type DynamicOptions<P = {}> =
| LoadableBaseOptions<P>
| LoadableSuspenseOptions
export type LoadableFn<P = {}> = (
opts: LoadableOptions<P> | LoadableSuspenseOptions
) => React.ComponentType<P>
export type LoadableComponent<P = {}> = React.ComponentType<P>
export function noSSR<P = {}>(
LoadableInitializer: LoadableFn<P>,
loadableOptions: LoadableBaseOptions<P>
): React.ComponentType<P> {
// Removing webpack and modules means react-loadable won't try preloading
delete loadableOptions.webpack
delete loadableOptions.modules
// This check is necessary to prevent react-loadable from initializing on the server
if (!isServerSide) {
return LoadableInitializer(loadableOptions)
}
const Loading = loadableOptions.loading!
// This will only be rendered on the server side
return () => (
<Loading error={null} isLoading pastDelay={false} timedOut={false} />
)
}
export default function dynamic<P = {}>(
dynamicOptions: DynamicOptions<P> | Loader<P>,
options?: DynamicOptions<P>
): React.ComponentType<P> {
let loadableFn: LoadableFn<P> = Loadable
let loadableOptions: LoadableOptions<P> = {
// A loading component is not required, so we default it
loading: ({ error, isLoading, pastDelay }) => {
if (!pastDelay) return null
if (process.env.NODE_ENV === 'development') {
if (isLoading) {
return null
}
if (error) {
return (
<p>
{error.message}
<br />
{error.stack}
</p>
)
}
}
return null
},
}
// Support for direct import(), eg: dynamic(import('../hello-world'))
// Note that this is only kept for the edge case where someone is passing in a promise as first argument
// The react-loadable babel plugin will turn dynamic(import('../hello-world')) into dynamic(() => import('../hello-world'))
// To make sure we don't execute the import without rendering first
if (dynamicOptions instanceof Promise) {
loadableOptions.loader = () => dynamicOptions
// Support for having import as a function, eg: dynamic(() => import('../hello-world'))
} else if (typeof dynamicOptions === 'function') {
loadableOptions.loader = dynamicOptions
// Support for having first argument being options, eg: dynamic({loader: import('../hello-world')})
} else if (typeof dynamicOptions === 'object') {
loadableOptions = { ...loadableOptions, ...dynamicOptions }
}
// Support for passing options, eg: dynamic(import('../hello-world'), {loading: () => <p>Loading something</p>})
loadableOptions = { ...loadableOptions, ...options }
const suspenseOptions = loadableOptions as LoadableSuspenseOptions
if (!process.env.__NEXT_CONCURRENT_FEATURES) {
// Error if react root is not enabled and `suspense` option is set to true
if (!process.env.__NEXT_REACT_ROOT && suspenseOptions.suspense) {
// TODO: add error doc when this feature is stable
throw new Error(
`Invalid suspense option usage in next/dynamic. Read more: https://nextjs.org/docs/messages/invalid-dynamic-suspense`
)
}
}
if (suspenseOptions.suspense) {
return loadableFn(suspenseOptions)
}
// coming from build/babel/plugins/react-loadable-plugin.js
if (loadableOptions.loadableGenerated) {
loadableOptions = {
...loadableOptions,
...loadableOptions.loadableGenerated,
}
delete loadableOptions.loadableGenerated
}
// support for disabling server side rendering, eg: dynamic(import('../hello-world'), {ssr: false})
if (typeof loadableOptions.ssr === 'boolean') {
if (!loadableOptions.ssr) {
delete loadableOptions.ssr
return noSSR(loadableFn, loadableOptions)
}
delete loadableOptions.ssr
}
return loadableFn(loadableOptions)
}