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flight-types-plugin.ts
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flight-types-plugin.ts
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import path from 'path'
import { webpack, sources } from 'next/dist/compiled/webpack/webpack'
import { WEBPACK_LAYERS } from '../../../lib/constants'
const PLUGIN_NAME = 'FlightTypesPlugin'
interface Options {
dir: string
appDir: string
dev: boolean
isEdgeServer: boolean
}
function createTypeGuardFile(
fullPath: string,
relativePath: string,
options: {
type: 'layout' | 'page'
}
) {
return `// File: ${fullPath}
import * as entry from '${relativePath}'
type TEntry = typeof entry
check<IEntry, TEntry>(entry)
type PageParams = Record<string, string>
interface PageProps {
params: any
searchParams?: any
}
interface LayoutProps {
children: React.ReactNode
params: any
}
export type PageComponent = (props: PageProps) => React.ReactNode | Promise<React.ReactNode>
export type LayoutComponent = (props: LayoutProps) => React.ReactNode | Promise<React.ReactNode>
interface IEntry {
${
options.type === 'layout'
? `default: LayoutComponent`
: `default: PageComponent`
}
config?: {}
generateStaticParams?: (params?: PageParams) => any[] | Promise<any[]>
revalidate?: RevalidateRange<TEntry> | false
dynamic?: 'auto' | 'force-dynamic' | 'error' | 'force-static'
dynamicParams?: boolean
fetchCache?: 'auto' | 'force-no-store' | 'only-no-store' | 'default-no-store' | 'default-cache' | 'only-cache' | 'force-cache'
preferredRegion?: 'auto' | 'home' | 'edge'
${options.type === 'page' ? "runtime?: 'nodejs' | 'experimental-edge'" : ''}
}
// =============
// Utility types
type RevalidateRange<T> = T extends { revalidate: any } ? NonNegative<T['revalidate']> : never
type Impossible<K extends keyof any> = { [P in K]: never }
function check<Base, T extends Base>(_mod: T & Impossible<Exclude<keyof T, keyof Base>>): void {}
// https://github.com/sindresorhus/type-fest
type Numeric = number | bigint
type Zero = 0 | 0n
type Negative<T extends Numeric> = T extends Zero ? never : \`\${T}\` extends \`-\${string}\` ? T : never
type NonNegative<T extends Numeric> = T extends Zero ? T : Negative<T> extends never ? T : '__invalid_negative_number__'
`
}
export class FlightTypesPlugin {
dir: string
appDir: string
dev: boolean
isEdgeServer: boolean
constructor(options: Options) {
this.dir = options.dir
this.appDir = options.appDir
this.dev = options.dev
this.isEdgeServer = options.isEdgeServer
}
apply(compiler: webpack.Compiler) {
const assetPrefix = this.dev ? '..' : this.isEdgeServer ? '..' : '../..'
const handleModule = (_mod: webpack.Module, assets: any) => {
if (_mod.layer !== WEBPACK_LAYERS.server) return
const mod: webpack.NormalModule = _mod as any
if (!mod.resource) return
if (!mod.resource.startsWith(this.appDir + path.sep)) return
if (!/\.(js|jsx|ts|tsx|mjs)$/.test(mod.resource)) return
const IS_LAYOUT = /[/\\]layout\.[^./\\]+$/.test(mod.resource)
const IS_PAGE = !IS_LAYOUT && /[/\\]page\.[^.]+$/.test(mod.resource)
const relativePathToApp = path.relative(this.appDir, mod.resource)
const relativePathToRoot = path.relative(this.dir, mod.resource)
const typePath = path.join(
'types',
'app',
relativePathToApp.replace(/\.(js|jsx|ts|tsx|mjs)$/, '.ts')
)
const relativeImportPath = path
.join(
path.relative(typePath, ''),
relativePathToRoot.replace(/\.(js|jsx|ts|tsx|mjs)$/, '')
)
.replace(/\\/g, '/')
const assetPath = assetPrefix + '/' + typePath.replace(/\\/g, '/')
if (IS_LAYOUT) {
assets[assetPath] = new sources.RawSource(
createTypeGuardFile(mod.resource, relativeImportPath, {
type: 'layout',
})
) as unknown as webpack.sources.RawSource
} else if (IS_PAGE) {
assets[assetPath] = new sources.RawSource(
createTypeGuardFile(mod.resource, relativeImportPath, {
type: 'page',
})
) as unknown as webpack.sources.RawSource
}
}
compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {
compilation.hooks.processAssets.tap(
{
name: PLUGIN_NAME,
stage: webpack.Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE_HASH,
},
(assets) => {
for (const entrypoint of compilation.entrypoints.values()) {
for (const chunk of entrypoint.chunks) {
compilation.chunkGraph.getChunkModules(chunk).forEach((mod) => {
handleModule(mod, assets)
})
}
}
}
)
})
}
}