[BUG] Error: Cannot find module 'tslib'

[LukasHeimann]

Describe the bug

Hi! First of all: Thank you for providing this great library.
With the update to the latest patch version of fast-csv, I started to get some error messages when trying to import the library:

Error: Cannot find module 'tslib'
     at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
     at Function.Module._load (internal/modules/cjs/loader.js:562:25)
     at Module.require (internal/modules/cjs/loader.js:692:17)
     at require (internal/modules/cjs/helpers.js:25:18)
     at Object.<anonymous> xxx/node_modules/@fast-csv/format/build/src/index.js:4:17)
     at Module._compile (internal/modules/cjs/loader.js:778:30)
     at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
     at Module.load (internal/modules/cjs/loader.js:653:32)
     at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
     at Function.Module._load (internal/modules/cjs/loader.js:585:3)

I assume, this is down to the following change in your tsconfig: 6668006#diff-17d19956339a21e53394cda05f5a6cc3R9

You added "importHelpers": true which will (as I found out) Import emit helpers from 'tslib'. Yet, tslib is not defined as a dependency, so I assume this compiler option emits some code that fails at runtime if the dependency is not present.

Parsing or Formatting?

• Formatting
• Parsing

To Reproduce

I'll update with a mwe, currently building one

Expected behavior

Importing the library should be possible without having to require tslib myself explicitly.

Desktop (please complete the following information):

• OS: Windows
• OS Version 10
• Node Version 10.18.1

(But also my Jenkins, which runs on Linux, but I don't know exact version there)

[LukasHeimann]

Minimal Working Example

Failure: https://github.com/LukasHeimann/fast-csv-bug --> just run npm i and node index.js
Working: https://github.com/LukasHeimann/fast-csv-bug/tree/working --> additionally imported tslib, though that should not be necessary in this very simple js-only project

[camillehe1992]

@LukasHeimann I met the same issue, and your solution works for me 👍thanks

[mannyvergel]

Also encountered this issue all of a sudden. Added tslib, but is there a way around this?

[EndersonPro]

@LukasHeimann Thanks, your solution work for me.

[doug-martin]

@LukasHeimann thank you for the bug report!

I have published a new version v4.1.5 which reverts the tsconfig changes. I apologize for the oversight.

I tested this out with a local repo and was able to run as expected. Let me know if you run into any more issues.

[LukasHeimann]

@doug-martin Stuff like this happens... Thank you for fixing this so fast! :)

[troyschneringer]

I continue to see this issue when running my app in GAE. I've even tried to add tslib explicitly as a dependency. Got any advice on how to figure this one out?

[doug-martin]

@troyschneringer what version is listed in your package-lock.json?

[troyschneringer]

dependency from package.json

"fast-csv": "^4.1.6"

relevant entries from yarn.lock

fast-csv@^4.1.6:
  version "4.1.6"
  resolved "https://registry.yarnpkg.com/fast-csv/-/fast-csv-4.1.6.tgz#a98fee885e492fd01aa618d61b59125d621b5c57"
  integrity sha512-Q6xhnJnsYws0Nr+P0KUbMBzrLIqdRjm5AsKkNffoK+/dDYikS73ybb3yroif/jRGRPK+6AtmrWgVi+dTelHdug==
  dependencies:
    "@fast-csv/format" "4.1.5"
    "@fast-csv/parse" "4.1.6"
    "@types/node" "^14.0.1"

"@fast-csv/[email protected]":
  version "4.1.5"
  resolved "https://registry.yarnpkg.com/@fast-csv/format/-/format-4.1.5.tgz#f4c21591f0b0cba728240dcb8b0caa7f28fd0f44"
  integrity sha512-SBwdUOJlFPvjlAuCxZeYrw5GGKdznXL/2PNldxewVNYVvM3r7yWix1N5Zrx1BpHYW/1J14k9An1fdWYNzt8zoQ==
  dependencies:
    lodash.escaperegexp "^4.1.2"
    lodash.isboolean "^3.0.3"
    lodash.isequal "^4.5.0"
    lodash.isfunction "^3.0.9"
    lodash.isnil "^4.0.0"

"@fast-csv/[email protected]":
  version "4.1.6"
  resolved "https://registry.yarnpkg.com/@fast-csv/parse/-/parse-4.1.6.tgz#43575fbc4f528062ab7a6a903a60b908f3e36af9"
  integrity sha512-ThLkqP4jhrKBoMqWtJt1GdLWzG4ZO4+r1+hNtk/9H2eAiNFmhsBpanjudAV9Sz1iihai4iLRJ3Q68WPe1IgySA==
  dependencies:
    lodash.escaperegexp "^4.1.2"
    lodash.groupby "^4.6.0"
    lodash.isfunction "^3.0.9"
    lodash.isnil "^4.0.0"
    lodash.isundefined "^3.0.1"
    lodash.uniq "^4.5.0"

tslib@^1.10.0, tslib@^1.8.1, tslib@^1.9.0:
  version "1.10.0"
  resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.10.0.tgz#c3c19f95973fb0a62973fb09d90d961ee43e5c8a"
  integrity sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==

Stack Trace from GAE

A 2020-05-19T15:54:39.544231Z     '/workspace/dist/index.js' 
A 2020-05-19T15:54:39.544212Z     '/workspace/dist/src/app.js', 
A 2020-05-19T15:54:39.544200Z     '/workspace/dist/src/compositionRoot.js', 
A 2020-05-19T15:54:39.544187Z     '/workspace/dist/src/services/index.js', 
A 2020-05-19T15:54:39.544174Z     '/workspace/dist/src/services/reportService.js', 
A 2020-05-19T15:54:39.544160Z     '/workspace/node_modules/fast-csv/build/src/index.js', 
A 2020-05-19T15:54:39.544145Z     '/workspace/node_modules/@fast-csv/format/build/src/index.js', 
A 2020-05-19T15:54:39.544130Z   requireStack: [ 
A 2020-05-19T15:54:39.544116Z   code: 'MODULE_NOT_FOUND', 
A 2020-05-19T15:54:39.544100Z     at Function.Module._load (internal/modules/cjs/loader.js:899:14) { 
A 2020-05-19T15:54:39.544071Z     at Module.load (internal/modules/cjs/loader.js:1000:32) 
A 2020-05-19T15:54:39.544057Z     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10) 
A 2020-05-19T15:54:39.544044Z     at Module._compile (internal/modules/cjs/loader.js:1156:30) 
A 2020-05-19T15:54:39.544029Z     at Object.<anonymous> (/workspace/node_modules/fast-csv/build/src/index.js:3:16) 
A 2020-05-19T15:54:39.543997Z     at require (internal/modules/cjs/helpers.js:77:18) 
A 2020-05-19T15:54:39.543986Z     at Module.require (internal/modules/cjs/loader.js:1042:19) 
A 2020-05-19T15:54:39.543973Z     at Function.Module._load (internal/modules/cjs/loader.js:899:14) 
A 2020-05-19T15:54:39.543958Z     at Module.load (internal/modules/cjs/loader.js:1000:32) 
A 2020-05-19T15:54:39.543942Z     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10) 
A 2020-05-19T15:54:39.543926Z     at Module._compile (internal/modules/cjs/loader.js:1156:30) 
A 2020-05-19T15:54:39.543910Z     at Object.<anonymous> (/workspace/node_modules/@fast-csv/format/build/src/index.js:4:17) 
A 2020-05-19T15:54:39.543893Z     at require (internal/modules/cjs/helpers.js:77:18) 
A 2020-05-19T15:54:39.543878Z     at Module.require (internal/modules/cjs/loader.js:1042:19) 
A 2020-05-19T15:54:39.543862Z     at Function.Module._load (internal/modules/cjs/loader.js:862:27) 
A 2020-05-19T15:54:39.543844Z     at Function.Module._resolveFilename (internal/modules/cjs/loader.js:980:15) 
A 2020-05-19T15:54:39.543825Z - /workspace/dist/index.js 
A 2020-05-19T15:54:39.543810Z - /workspace/dist/src/app.js 
A 2020-05-19T15:54:39.543797Z - /workspace/dist/src/compositionRoot.js 
A 2020-05-19T15:54:39.543783Z - /workspace/dist/src/services/index.js 
A 2020-05-19T15:54:39.543768Z - /workspace/dist/src/services/reportService.js 
A 2020-05-19T15:54:39.543748Z - /workspace/node_modules/fast-csv/build/src/index.js 
A 2020-05-19T15:54:39.543734Z - /workspace/node_modules/@fast-csv/format/build/src/index.js 
A 2020-05-19T15:54:39.543720Z Require stack: 
A 2020-05-19T15:54:39.543711Z Error: Cannot find module 'tslib' 

[troyschneringer]

Looks like I may have been running into a caching issue with GAE and node. Running

gcloud beta app deploy --no-cache

solved the issue for me on version 4.2.0. Thanks for your quick responses and fixes.