rsnext/packages/next/build/webpack/loaders/next-middleware-loader.ts
Naoyuki Kanezawa 7c103fac7d
fix process polyfill on middleware (#34426)
Fixes the problem that global `process` variable has only the `env` field.
Also fixed the issue that the `env` field is empty when the `process` module is used as the value of the variable (which happens when the module is contained in a dependency of application).

## Bug

- [ ] Related issues linked using `fixes #number`
- [x] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`
2022-02-18 08:39:30 +00:00

37 lines
1.1 KiB
TypeScript

import { stringifyRequest } from '../stringify-request'
export type MiddlewareLoaderOptions = {
absolutePagePath: string
page: string
}
export default function middlewareLoader(this: any) {
const { absolutePagePath, page }: MiddlewareLoaderOptions = this.getOptions()
const stringifiedPagePath = stringifyRequest(this, absolutePagePath)
return `
import { adapter } from 'next/dist/server/web/adapter'
// The condition is true when the "process" module is provided
if (process !== global.process) {
// prefer local process but global.process has correct "env"
process.env = global.process.env;
global.process = process;
}
var mod = require(${stringifiedPagePath})
var handler = mod.middleware || mod.default;
if (typeof handler !== 'function') {
throw new Error('The Middleware "pages${page}" must export a \`middleware\` or a \`default\` function');
}
export default function (opts) {
return adapter({
...opts,
page: ${JSON.stringify(page)},
handler,
})
}
`
}