[Bug]: Left side of comma operator is unused and has no side effect (v27.1.3)

[flo-sch]

Version

27.1.3

Steps to reproduce

Reproduction steps:

1. Clone my repository at https://github.com/flo-sch/ts-jest-27-1-3-issue-reproduction-global-teardown
2. Follow the instructions in README.md to both get started and reproduce the bug

The setup is a bit complicated since the tests are backed by a postgresql database, hopefully the instructions are clear enough

Expected behavior

Updating ts-jest from v27.1.2 to v27.1.3 should not break my tests

Actual behavior

Something in v27.1.3 make my tests fail with an error message

Debug log

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pattern."},"The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation":{"category":1,"code":2404,"key":"The_left_hand_side_of_a_for_in_statement_cannot_use_a_type_annotation_2404","message":"The left-hand side of a 'for...in' statement cannot use a type annotation."},"The_left_hand_side_of_a_for_in_statement_may_not_be_an_optional_property_access":{"category":1,"code":2780,"key":"The_left_hand_side_of_a_for_in_statement_may_not_be_an_optional_property_access_2780","message":"The left-hand side of a 'for...in' statement may not be an optional property access."},"The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access":{"category":1,"code":2406,"key":"The_left_hand_side_of_a_for_in_statement_must_be_a_variable_or_a_property_access_2406","message":"The left-hand side of a 'for...in' statement must be a variable or a property 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type."},"The_left_hand_side_of_an_assignment_expression_may_not_be_an_optional_property_access":{"category":1,"code":2779,"key":"The_left_hand_side_of_an_assignment_expression_may_not_be_an_optional_property_access_2779","message":"The left-hand side of an assignment expression may not be an optional property access."},"The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access":{"category":1,"code":2364,"key":"The_left_hand_side_of_an_assignment_expression_must_be_a_variable_or_a_property_access_2364","message":"The left-hand side of an assignment expression must be a variable or a property access."},"The_left_hand_side_of_an_in_expression_must_be_a_private_identifier_or_of_type_any_string_number_or_symbol":{"category":1,"code":2360,"key":"The_left_hand_side_of_an_in_expression_must_be_a_private_identifier_or_of_type_any_string_number_or__2360","message":"The left-hand side of an 'in' expression must be a private identifier or of type 'any', 'string', 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Additional context

Hi,

I am running integration tests on a Fastify server application backed by a postgresql database, within a https://nx.dev monorepository workspace.

While the jest setup seems a bit flaky to me, tests successfully run using ts-jest 27.1.2.

Migrating to 27.1.3 however make them fail with the following message (as illustrated in the repository branch):

[TSError: apps/example-app-integration/jest/globalTeardown.ts:5:13 - error TS2695: Left side of comma operator is unused and has no side effects.

I am not fully sure if ts-jest in itself is the problem, perhaps it is how I register my global scripts, but cannot figure out what the issue is, technically 😅

Environment

System:
  OS: macOS 12.1
  CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
Binaries:
  Node: 16.13.2 - ~/.nvm/versions/node/v16.13.2/bin/node
  Yarn: 1.22.17 - /usr/local/bin/yarn
  npm: 8.3.1 - ~/.nvm/versions/node/v16.13.2/bin/npm
npmPackages:
  jest: ^27.5 => 27.5.1

[yannbriancon]

Hello @flo-sch
I have the same issue, did you find any solution?

[flo-sch]

Hi @yannbriancon, I locked the version of ts-jest to 27.1.2 for now unfortunately since I am without solution at the moment.

I hope it gets fixed in the future

[ahnpnl]

I'd recommend to stay on 27.1.2 since 27.1.3 doesn't contain anything important. We are likely going to change internal ts-jest in v28 which will likely fix this issue.

Besides, it would be more helpful if your repo can be smaller so we can get a chance to test this bug without complex setup with postgresql.

[flo-sch]

Alright thanks for the notice :)

Just hope v28 will not contain too many breaking changes, but looking forward to try it out

[alko89]

I'm having the same issue in globalTeardown, globalSetup works fine. I've updated jest and ts-jest to v28 and get the same error.

[sashatrn]

I have this issue with 28.0.7. I workarounded it by using plain JS for globalTeardown instead of TS.

[mkuklis]

I see the same issue with v29.0.1 with globalSetup

[florian-besser]

Seeing the same problem with v29.0.3 and globalSetup. Was working fine pre v29