ts-jest seems to cache compiled modules over and over again, creating a memory leak. By forcing a garbage collection, the memory is released which indicates that the garbage collector knows it can be cleaned up, but isn't able to. There is a basline suite of tests using just jest on main
Steps to reproduce the behavior:
git clone [email protected]:willsoto/jest-repro.git (note the branch is ts-jest-memory-leak)npm cinpm run test:force-gc to see memory usage when a garbage collection is forced.
Modules should be cached once for the duration of the test run or allowed to be garbage collected after the test suite has completed.
https://github.com/willsoto/jest-repro/tree/ts-jest-memory-leak
This is the log from the full run, no forced garbage collection: npm test.
❯ TS_JEST_LOG=ts-jest.log npm run test
> [email protected] test jest-repro
> jest --no-cache --runInBand --logHeapUsage ./test
PASS test/with-nest/test10.spec.ts (79 MB heap size)
PASS test/with-nest/test11.spec.ts (97 MB heap size)
PASS test/with-nest/test12.spec.ts (125 MB heap size)
PASS test/with-nest/test1.spec.ts (150 MB heap size)
PASS test/with-nest/test2.spec.ts (176 MB heap size)
PASS test/with-nest/test3.spec.ts (94 MB heap size)
PASS test/with-nest/test4.spec.ts (120 MB heap size)
PASS test/with-nest/test7.spec.ts (145 MB heap size)
PASS test/with-nest/test5.spec.ts (170 MB heap size)
PASS test/with-nest/test6.spec.ts (195 MB heap size)
PASS test/with-nest/test8.spec.ts (220 MB heap size)
PASS test/with-nest/test9.spec.ts (245 MB heap size)
PASS test/force-gc/test12.spec.ts (256 MB heap size)
PASS test/force-gc/test10.spec.ts (277 MB heap size)
PASS test/force-gc/test11.spec.ts (288 MB heap size)
PASS test/force-gc/test7.spec.ts (297 MB heap size)
PASS test/force-gc/test4.spec.ts (306 MB heap size)
PASS test/force-gc/test6.spec.ts (328 MB heap size)
PASS test/force-gc/test1.spec.ts (338 MB heap size)
PASS test/force-gc/test5.spec.ts (347 MB heap size)
PASS test/force-gc/test9.spec.ts (356 MB heap size)
PASS test/force-gc/test8.spec.ts (178 MB heap size)
PASS test/force-gc/test3.spec.ts (188 MB heap size)
PASS test/force-gc/test2.spec.ts (210 MB heap size)
PASS test/without-nest/test10.spec.ts (219 MB heap size)
PASS test/without-nest/test11.spec.ts (228 MB heap size)
PASS test/without-nest/test12.spec.ts (250 MB heap size)
PASS test/without-nest/test1.spec.ts (259 MB heap size)
PASS test/without-nest/test2.spec.ts (268 MB heap size)
PASS test/without-nest/test3.spec.ts (277 MB heap size)
PASS test/without-nest/test4.spec.ts (299 MB heap size)
PASS test/without-nest/test7.spec.ts (308 MB heap size)
PASS test/without-nest/test5.spec.ts (317 MB heap size)
PASS test/without-nest/test6.spec.ts (338 MB heap size)
PASS test/without-nest/test8.spec.ts (348 MB heap size)
PASS test/without-nest/test9.spec.ts (357 MB heap size)
Test Suites: 36 passed, 36 total
Tests: 3600 passed, 3600 total
Snapshots: 0 total
Time: 10.716 s
Ran all test suites matching /.\/test/i.
ts-jest.log
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System:
OS: macOS 10.15.6
CPU: (8) x64 Intel(R) Core(TM) i7-4980HQ CPU @ 2.80GHz
Binaries:
Node: 12.18.3 - ~/.volta/tools/image/node/12.18.3/bin/node
Yarn: 1.22.4 - ~/.volta/tools/image/yarn/1.22.4/bin/yarn
npm: 6.14.5 - ~/.volta/tools/image/npm/6.14.5/bin/npm
npmPackages:
jest: ^26.4.2 => 26.4.2
ts-jest: ^26.3.0 => 26.3.0
typescript: ^4.0.2 => 4.0.2


An interesting observation as I was exploring this was whether or not I was using a custom tsConfig. I'm not sure if this has a meaningful impact on smaller apps, but for large apps the difference is substantial.
When I point ts-jest at a custom tsconfig with an include: [] (an idea I got from this repo), base memory usage goes down significantly but still climbs consistent with a memory leak. When I use whatever the default is, base memory usage increases significantly.
@ahnpnl I am more than willing to work on this issue since this is a big problem once there are hundreds of source files. We've seen heap usage climb to 1.5gb in some cases. If you can point me to possible culprits that would be great.
When I point
ts-jestat a customtsconfigwith aninclude: [](an idea I got from this repo), base memory usage goes down significantly but still climbs consistent with a memory leak. When I use whatever the default is, base memory usage increases significantly.
This has been mentioned in the doc https://kulshekhar.github.io/ts-jest/user/config/isolatedModules
The reason for that is: when specifying include: [], TypeScript LanguageService will do lazy fetch modules which will reduce overhead I/O at start up.
Feel free to pick up this one @willsoto :)
@ahnpnl can you point me to any possible places to start looking?
You can look into this one https://github.com/kulshekhar/ts-jest/blob/master/src/compiler/language-service.ts#L175 . This is the place where I/O overhead appears.
What would you suggest in such case for now, until investigation is happening?
Downgrade to lower version? but then there is no solution right now for projects that started upgrading to typescript v4 ?
The workaround is following the doc https://kulshekhar.github.io/ts-jest/user/config/isolatedModules
If using isolatedModules: true, you should combine with tsc for type checking.
@ahnpnl That does not resolve the problem, it simply reduces growth but does not mitigate it entirely.
After looking into this all day yesterday, we managed to reduce the issue to jest + typescript. You can see a minimal reproduction here where we introduced a minimal transformer that just compiles the TS via transpileModule. The memory leak still exists.

Our working assumption right now is that there is some negative interaction between Jest and TypeScript. Given Jest's history of memory leaks, we assume the fault is on Jest's side but are still working on a minimal reproduction.
Give this information, do you have any other thoughts on this @ahnpnl ?
If transpileModule still produces memory leak, I also think the problem is more in Jest or TypeScript side. I think the issue might be more on Jest side.
Out of curiosity, have you tried with jest CLI flag runInBand @willsoto ? If yes, does it produce the similar leak behavior ?
@ahnpnl You can see in the last screenshot that we are running with --runInBand. All of our tests have been using the following flags for consistency: --no-cache --runInBand --logHeapUsage
I bet my cents on jest 😅
Reported with Jest here. I think this issue should remain open though in case others come looking, if that is okay?
Sure I think that is a good idea 👍
Most helpful comment
Sure I think that is a good idea 👍