`TS2354 This syntax requires an imported helper but module 'tslib' cannot be found.` #12

bluetech · 2017-04-18T13:24:12Z

I see that the code has some references to tslib and importHelpers so I assume this should work transparently. If not, I'll be happy to know what is missing.

Here is how to reproduce:

Installed packages:

$ npm ls --depth=0
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
└── [email protected]

tsconfig.json:

{
    "compilerOptions": {
        "target": "es5"
    }
}

rollup.config.js:

import typescript from 'rollup-plugin-typescript2';

export default {
	entry: './main.ts',

	plugins: [
		typescript()
	]
}

main.ts:

import {Foo} from './module';

console.log("HERE" + Foo);

And module.ts:

export class Foo {}

export class Bar extends Foo {}

When running rollup as follows:

./node_modules/.bin/rollup -c rollup.config.js

I get this error:

🚨   rpt2: module.ts (3,18): semantic error TS2354 This syntax requires an imported helper but module 'tslib' cannot be found.
module.ts

I think this is because the extends syntax requires an __extends helper from tslib, but typescript can't find tslib.

Expected result is that the required helpers become part of the bundle.

Thanks.

The text was updated successfully, but these errors were encountered:

ezolenko · 2017-04-18T15:58:13Z

This is definitely supposed to work transparently (and works for me in my own projects). I'll try your exact setup, thanks.

ezolenko · 2017-04-19T15:49:37Z

Looks like you need "moduleResolution": "node" in tsconfig, otherwise typescript can't find tslib in node_modules.

Not sure if that could pose problems on non-node setups, but I haven't heard anything to that effect yet.

bluetech · 2017-04-19T16:49:57Z

Indeed, with "moduleResolution": "node", it works as expected. Reading https://www.typescriptlang.org/docs/handbook/module-resolution.html, I think "node" is a better fit for me, so I'll just use it. May I suggest mentioning/recommending it in the README?

I see that you opened #14 for the "classic" case, so I'll close this. Thanks!

ezolenko/rollup-plugin-typescript2#12

hueitan · 2019-09-19T15:18:53Z

Not sure anyone else facing the same problem as mine.

I was having this problem rollup/rollup-plugin-typescript#109, therefore I switch to this repo, but then I'm getting this tslib error.

as the tsconfig is already "moduleResolution": "node"

ezolenko · 2019-09-19T15:55:06Z

If you post your tsconfig, rollup config and package.json, somebody might spot something amiss.

giniedp · 2019-09-28T10:22:59Z

@hueitan i faced the same issue while already having "moduleResolution": "node". Fixed it by adding "tslib": "^1.10.0" to my devDependencies.

hueitan · 2019-10-01T10:55:50Z

adding tslib as the dependencies work to me as well. although not the pretty solution

ezolenko · 2019-10-01T16:12:24Z

tslib is already a dependency of rollup-plugin-typescript2, how does it end up missing on your system?

Do you use npm install or something else?

giniedp · 2019-10-01T17:08:47Z

in my case i am using yarn. Deleting the yarn.lock and reinstalling fresh, i do not need an explicit mention of tslib in the package.json

I can reproduce it in the following repo:

https://github.com/giniedp/tweak-ui

git clone [email protected]:giniedp/tweak-ui.git
cd tweak-ui
git checkout v0.1.0

now edit the package.json and remove tslib. Then do

yarn install
yarn run build

you should run into

This syntax requires an imported helper named '__spreadArrays', but module 'tslib' has no exported member '__spreadArrays'

now delete the yarn.lock and then

yarn install
yarn run build

runs fine.

ezolenko/rollup-plugin-typescript2#12 (comment)

imnickvaughn · 2019-10-04T17:10:12Z

This was fixed with this

@hueitan i faced the same issue while already having "moduleResolution": "node". Fixed it by adding "tslib": "^1.10.0" to my devDependencies.

Fixed! Mine was in regular dependencies.

vishnu-85 · 2020-01-19T17:49:21Z

Fixed it by adding "tslib": "^1.10.0" to my dependencies.

Seanmclem · 2020-04-28T20:10:47Z

npm i tslib -D

worked for me too

mesqueeb · 2020-05-17T01:33:20Z

Like @ezolenko says: While npm i tslib -D works, this should not be used as the solution, because:

tslib is already a dependency of rollup-plugin-typescript2, how does it end up missing on your system?

Do you use npm install or something else?

What worked in my case and is the better solution is to delete package-lock and node_modules and reinstall.

rm -rf ./node_modules
rm -rf ./package-lock.json
npm i

Yangsou · 2020-05-21T03:19:29Z

@hueitan i faced the same issue while already having "moduleResolution": "node". Fixed it by adding "tslib": "^1.10.0" to my devDependencies.

Thank you, It's so helpful

caroso1222 · 2020-07-07T13:13:45Z

None of the proposed solutions worked for me. Upgrading rollup-plugin-typescript2 did the trick.

npm i [email protected]

It turns out rollup was using [email protected] even when I had ^1.10.0 in devDependencies. I realized rollup-plugin-typescript2 was overriding the tslib version. I was using v0.20.1; upgraded to v0.27.1.

zimejin · 2020-07-19T18:18:43Z

Weird behavior, But restarting VS code worked for me. I didn't have the issue previously, it just came up after doing an package install.

irodger · 2020-11-30T20:57:32Z

Fixed it by adding "tslib": "^1.10.0" to my dependencies.

Thanks. Just added to peerDependencies and it works well for me, do not need to install

yehonadav · 2021-04-01T20:49:56Z

I had this error:

semantic error TS2343: This syntax requires an imported helper named '__spreadArray' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.

Fixed it by adding "tslib": "^2.1.0" to my dependencies.

aman2talk · 2021-04-16T06:06:22Z

You can simply upgrade your tslib version. I did mine from [email protected] to tslib@^2.2.0 which is the latest one by the time and it fixed my "__spreadArray" issue.

- to fix module 'tslib' cannot be found error - ref: ezolenko/rollup-plugin-typescript2#12

* chore: add .yarnrc.yml * chore: add yarn-berry.cjs * chore: install packages with yarn berry * chore: ignore yarn related files * chore: remove package-lock.json * chore: enable Plug'n'Play * chore: enable vscode integrations - ref: https://yarnpkg.com/getting-started/editor-sdks * chore: enable Yarn's Typescript plugin - helps manage `@types/*` dependencies automatically - ref: https://github.com/yarnpkg/berry/tree/master/packages/plugin-typescript * chore: upgrade rollup-plugin-typescript2(v0.30.0), add tslib - to fix module 'tslib' cannot be found error - ref: ezolenko/rollup-plugin-typescript2#12 * chore: install yarn pnpify * test: fix "cannot find global" ts error * chore: remove .yarn/install-state.gz * ci: apply yarn to CI workflow scripts * docs: update CONTRIBUTING to use yarn berry * ci: update CI workflow to not use actions-yarn - 퍼포먼스가 30초 vs 2초로 너무 파멸적으로 차이나기 때문에 배제했습니다. * docs: fix typo in CONTRIBUTING * chore: add yarn files, dir to .npmignore * chore: install amplitude-js with yarn * test: remove unnecessary global

…/rollup-plugin-typescript2/issues/12\#issuecomment-536173372

ezolenko mentioned this issue Apr 19, 2017

Imported helper support requires "moduleResolution": "node" in tsconfig #14

Closed

bluetech closed this as completed Apr 19, 2017

jasonkuhrt added a commit to jasonkuhrt/forto that referenced this issue Sep 20, 2018

fix: weird tslib error on object spread operator

53e65e3

ezolenko/rollup-plugin-typescript2#12

victorhqc added a commit to victorhqc/touchbar-electron-renderer that referenced this issue Oct 4, 2019

build: fix package-lock

0061081

ezolenko/rollup-plugin-typescript2#12 (comment)

onursumer mentioned this issue May 1, 2020

Fix jitpack build cBioPortal/cbioportal-frontend#3189

Merged

3 tasks

birtles mentioned this issue Jun 11, 2020

module 'tslib' cannot be found when importing from a sibling directory #231

Closed

brandon-leapyear mentioned this issue Nov 18, 2020

[Case Study] Can't find tslib with rollup-plugin-typescript2 yarnpkg/berry#2140

Closed

IronSean mentioned this issue May 18, 2021

tslib import issues in #12 are still rampant #270

Closed

vince19972 mentioned this issue Jun 25, 2021

[deps] add tslib to fix rollup build error stakefish/stakefish-ui-legacy#32

Merged

s-ong-c mentioned this issue Jul 10, 2021

Chore: yarn berry 마이그레이션 Lubycon/lubycon-utils#8

Merged

xanf mentioned this issue Aug 26, 2021

chore(deps): bump vue to 3.2 vuejs/test-utils#889

Merged

greatSumini added a commit to greatSumini/react-analytics-provider that referenced this issue Aug 28, 2021

chore: upgrade rollup-plugin-typescript2(v0.30.0), add tslib

897222a

- to fix module 'tslib' cannot be found error - ref: ezolenko/rollup-plugin-typescript2#12

agilgur5 added the scope: dependencies Issues or PRs about updating a dependency label May 2, 2022

agilgur5 added kind: support Asking for support with something or a specific use case scope: docs Documentation could be improved. Or changes that only affect docs labels May 21, 2022

agilgur5 changed the title ~~This syntax requires an imported helper but module 'tslib' cannot be found.~~ TS2354 This syntax requires an imported helper but module 'tslib' cannot be found. May 22, 2022

agilgur5 mentioned this issue May 26, 2022

TS2354 error: module 'tslib' cannot be found -- use moduleResolution: "node" #29

Closed

agilgur5 added solution: tsc behavior This is tsc's behavior as well, so this is not a bug with this plugin and removed solution: tsc behavior This is tsc's behavior as well, so this is not a bug with this plugin labels Jun 21, 2022

apperside referenced this issue in apperside/react-query-typed-api Jan 2, 2023

added tslib dev lib because of this issue https://github.com/ezolenko…

66b34d8

…/rollup-plugin-typescript2/issues/12\#issuecomment-536173372

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`TS2354 This syntax requires an imported helper but module 'tslib' cannot be found.` #12

`TS2354 This syntax requires an imported helper but module 'tslib' cannot be found.` #12

bluetech commented Apr 18, 2017 •

edited by agilgur5

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ezolenko commented Apr 18, 2017 •

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ezolenko commented Apr 19, 2017 •

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bluetech commented Apr 19, 2017

hueitan commented Sep 19, 2019 •

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ezolenko commented Sep 19, 2019

giniedp commented Sep 28, 2019

hueitan commented Oct 1, 2019

ezolenko commented Oct 1, 2019 •

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giniedp commented Oct 1, 2019

imnickvaughn commented Oct 4, 2019 •

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vishnu-85 commented Jan 19, 2020 •

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Seanmclem commented Apr 28, 2020 •

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mesqueeb commented May 17, 2020 •

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Yangsou commented May 21, 2020

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zimejin commented Jul 19, 2020

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yehonadav commented Apr 1, 2021 •

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aman2talk commented Apr 16, 2021 •

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TS2354 This syntax requires an imported helper but module 'tslib' cannot be found. #12

TS2354 This syntax requires an imported helper but module 'tslib' cannot be found. #12

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bluetech commented Apr 18, 2017 • edited by agilgur5 Loading

ezolenko commented Apr 18, 2017 • edited Loading

ezolenko commented Apr 19, 2017 • edited by agilgur5 Loading

bluetech commented Apr 19, 2017

hueitan commented Sep 19, 2019 • edited Loading

ezolenko commented Sep 19, 2019

giniedp commented Sep 28, 2019

hueitan commented Oct 1, 2019

ezolenko commented Oct 1, 2019 • edited Loading

giniedp commented Oct 1, 2019

imnickvaughn commented Oct 4, 2019 • edited by agilgur5 Loading

vishnu-85 commented Jan 19, 2020 • edited by agilgur5 Loading

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aman2talk commented Apr 16, 2021 • edited by agilgur5 Loading

`TS2354 This syntax requires an imported helper but module 'tslib' cannot be found.` #12

`TS2354 This syntax requires an imported helper but module 'tslib' cannot be found.` #12

bluetech commented Apr 18, 2017 •

edited by agilgur5

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ezolenko commented Apr 18, 2017 •

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ezolenko commented Apr 19, 2017 •

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hueitan commented Sep 19, 2019 •

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ezolenko commented Oct 1, 2019 •

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imnickvaughn commented Oct 4, 2019 •

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vishnu-85 commented Jan 19, 2020 •

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Seanmclem commented Apr 28, 2020 •

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mesqueeb commented May 17, 2020 •

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caroso1222 commented Jul 7, 2020 •

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irodger commented Nov 30, 2020 •

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yehonadav commented Apr 1, 2021 •

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aman2talk commented Apr 16, 2021 •

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