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produce source maps for middlewares (#34409)
This PR will generate source maps for middlewares. It's not under any flag (should it be?) Closes #34523
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packages/next/build/webpack/plugins/middleware-source-maps-plugin.ts
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import { webpack } from 'next/dist/compiled/webpack/webpack' | ||
import type { webpack5 } from 'next/dist/compiled/webpack/webpack' | ||
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/** | ||
* Produce source maps for middlewares. | ||
* Currently we use the same compiler for browser and middlewares, | ||
*/ | ||
export const getMiddlewareSourceMapPlugins = () => { | ||
return [ | ||
new webpack.SourceMapDevToolPlugin({ | ||
filename: '[file].map', | ||
include: [ | ||
// Middlewares are the only ones who have `server/pages/[name]` as their filename | ||
/^server\/pages\//, | ||
// All middleware chunks | ||
/^server\/middleware-chunks\//, | ||
], | ||
}), | ||
new MiddlewareSourceMapsPlugin(), | ||
] | ||
} | ||
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/** | ||
* Produce source maps for middlewares. | ||
* Currently we use the same compiler for browser and middlewares, | ||
* so we can avoid having the custom plugins if the browser source maps | ||
* are emitted. | ||
*/ | ||
class MiddlewareSourceMapsPlugin { | ||
apply(compiler: webpack5.Compiler): void { | ||
const PLUGIN_NAME = 'NextJsMiddlewareSourceMapsPlugin' | ||
compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => { | ||
compilation.hooks.buildModule.tap(PLUGIN_NAME, (module) => { | ||
module.useSourceMap = module.layer === 'middleware' | ||
}) | ||
}) | ||
} | ||
} |
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test/production/generate-middleware-source-maps/index.test.ts
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import { createNext } from 'e2e-utils' | ||
import { NextInstance } from 'test/lib/next-modes/base' | ||
import fs from 'fs-extra' | ||
import path from 'path' | ||
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describe('experimental.middlewareSourceMaps: true', () => { | ||
let next: NextInstance | ||
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beforeAll(async () => { | ||
next = await createNext({ | ||
nextConfig: { | ||
experimental: { | ||
middlewareSourceMaps: true, | ||
}, | ||
}, | ||
files: { | ||
'pages/_middleware.js': ` | ||
export default function middleware() { | ||
return new Response("Hello, world!"); | ||
} | ||
`, | ||
}, | ||
dependencies: {}, | ||
}) | ||
}) | ||
afterAll(() => next.destroy()) | ||
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it('generates a source map', async () => { | ||
const middlewarePath = path.resolve( | ||
next.testDir, | ||
'.next/server/pages/_middleware.js' | ||
) | ||
expect(await fs.pathExists(middlewarePath)).toEqual(true) | ||
expect(await fs.pathExists(`${middlewarePath}.map`)).toEqual(true) | ||
}) | ||
}) | ||
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describe('experimental.middlewareSourceMaps: false', () => { | ||
let next: NextInstance | ||
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beforeAll(async () => { | ||
next = await createNext({ | ||
files: { | ||
'pages/_middleware.js': ` | ||
export default function middleware() { | ||
return new Response("Hello, world!"); | ||
} | ||
`, | ||
}, | ||
dependencies: {}, | ||
}) | ||
}) | ||
afterAll(() => next.destroy()) | ||
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it('does not generate a source map', async () => { | ||
const middlewarePath = path.resolve( | ||
next.testDir, | ||
'.next/server/pages/_middleware.js' | ||
) | ||
expect(await fs.pathExists(middlewarePath)).toEqual(true) | ||
expect(await fs.pathExists(`${middlewarePath}.map`)).toEqual(false) | ||
}) | ||
}) |