undici/lib/fetch/headers.js: Unexpected token (300:44)

Bug Description

Getting this error on serverless project.

Error: Parsing file .../test_server/node_modules/undici/lib/fetch/headers.js: Unexpected token (300:44)
      at Deps.parseDeps (.../test_server/node_modules/module-deps/index.js:519:15)
      at getDeps (.../test_server/node_modules/module-deps/index.js:447:44)
      at .../test_server/node_modules/module-deps/index.js:430:38
      at ConcatStream.<anonymous> (.../test_server/node_modules/concat-stream/index.js:37:43)
      at ConcatStream.emit (node:events:532:35)
      at ConcatStream.emit (node:domain:475:12)
      at finishMaybe (.../test_server/node_modules/readable-stream/lib/_stream_writable.js:630:14)
      at endWritable (.../test_server/node_modules/readable-stream/lib/_stream_writable.js:638:3)
      at ConcatStream.Writable.end (.../test_server/node_modules/readable-stream/lib/_stream_writable.js:594:41)
      at DuplexWrapper.onend (.../test_server/node_modules/readable-stream/lib/_stream_readable.js:577:10)
      at Object.onceWrapper (node:events:639:28)
      at DuplexWrapper.emit (node:events:532:35)
      at DuplexWrapper.emit (node:domain:475:12)
      at endReadableNT (.../test_server/node_modules/readable-stream/lib/_stream_readable.js:1010:12)
      at processTicksAndRejections (node:internal/process/task_queues:83:21)

Reproducible By

Here is an example repository for the issue: https://github.com/BRoy98/undici-serverless

Note: It happens only when serverless-plugin-optimize is being used to optimize the handlers.

Steps to reproduce:

• Clone the repository
• Install dependencies: yarn install
• Invoke the function: yarn invoke

To disable the optimize plugin, uncomment #L10 on serverless.yml: https://github.com/BRoy98/undici-serverless/blob/b15fb3ad50c1a2f81d1391636bc06a1794684622/serverless.yml#L10

Expected Behavior

Should run without error.

Environment

Tested on: MacOS monterey 12.4 (21F79) and Ubuntu Latest (github actions) Node v16.14.0 and Node v14.19.3

[jimmywarting]

think that acorn/detective should be updated to support ?? will help more ppl that use ?? elsewhere that don’t just use undici

[avanelli]

??= assignment converted