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Original file line number | Diff line number | Diff line change |
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import MagicString from 'magic-string' | ||
import { ResolvedConfig } from '..' | ||
import { Plugin } from '../plugin' | ||
|
||
/** | ||
* This plugin hooks into Node's module resolution algorithm at runtime, | ||
* so that SSR builds can benefit from `resolve.dedupe` like they do | ||
* in development. | ||
*/ | ||
export function ssrRequireHookPlugin(config: ResolvedConfig): Plugin | null { | ||
if (config.command !== 'build' || !config.resolve.dedupe?.length) { | ||
return null | ||
} | ||
return { | ||
name: 'vite:ssr-require-hook', | ||
transform(code, id) { | ||
const moduleInfo = this.getModuleInfo(id) | ||
if (moduleInfo?.isEntry) { | ||
const s = new MagicString(code) | ||
s.prepend( | ||
`;(${dedupeRequire.toString()})(${JSON.stringify( | ||
config.resolve.dedupe | ||
)});\n` | ||
) | ||
return { | ||
code: s.toString(), | ||
map: s.generateMap({ | ||
source: id | ||
}) | ||
} | ||
} | ||
} | ||
} | ||
} | ||
|
||
type NodeResolveFilename = ( | ||
request: string, | ||
parent: NodeModule, | ||
isMain: boolean, | ||
options?: Record<string, any> | ||
) => string | ||
|
||
/** Respect the `resolve.dedupe` option in production SSR. */ | ||
function dedupeRequire(dedupe: string[]) { | ||
const Module = require('module') as { _resolveFilename: NodeResolveFilename } | ||
const resolveFilename = Module._resolveFilename | ||
Module._resolveFilename = function (request, parent, isMain, options) { | ||
if (request[0] !== '.' && request[0] !== '/') { | ||
const parts = request.split('/') | ||
const pkgName = parts[0][0] === '@' ? parts[0] + '/' + parts[1] : parts[0] | ||
if (dedupe.includes(pkgName)) { | ||
// Use this module as the parent. | ||
parent = module | ||
} | ||
} | ||
return resolveFilename!(request, parent, isMain, options) | ||
} | ||
} | ||
|
||
export function hookNodeResolve( | ||
getResolver: (resolveFilename: NodeResolveFilename) => NodeResolveFilename | ||
): () => void { | ||
const Module = require('module') as { _resolveFilename: NodeResolveFilename } | ||
const prevResolver = Module._resolveFilename | ||
Module._resolveFilename = getResolver(prevResolver) | ||
return () => { | ||
Module._resolveFilename = prevResolver | ||
} | ||
} |
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