Ts-jest: Usage of ... and lodash makes typescript output js file without import and causes undefined error

[asfernandes]

Get this repository: https://github.com/bhouser/jestReactMockTsx

In typescript subdirectory, do:

npm install --save-dev lodash @types/lodash

Replace ParentComponent.tsx with this content:

import * as React from 'react';
import ChildComponent from './ChildComponent';

import * as _ from 'lodash';

function x() {
    return { ..._.isNil };
}

export default function ParentComponent() {
    return (
        <div
            { ...x() }
        >
            <div className="parentComponent">
                <ChildComponent />;
            </div>
        </div>
    );
}

You will see that usage of { ..._.isNil } makes the transformed source to omit the require for ChildComponent.

When you compile the project with tsc, it does it correctly.

I was using this in a real project and it was working. It was abandoned and when I get it again it was full of upgrade issues with react and react-router. After all updates, I'm having this problem.

I tried to downgrade typescript but I still see this with ts-jest.

[kulshekhar]

please create a repo such that git clone, yarn install / npm install & yarn test / npm test reproduces the issue

[asfernandes]

Clone https://github.com/asfernandes/issue-ts-jest-198

npm install && npm test

[kulshekhar]

@asfernandes thanks!

I was able to reproduce this. I'm not sure what's causing this but I'm marking this as a bug because it compiles fine with tsc

[vslinko]

I spent few hours to debug a problem and I've found that the problem is already fixed in https://github.com/Microsoft/TypeScript/pull/15566

[vslinko]

I've checked with [email protected] and yes, it works.

[vslinko]

ref https://github.com/Microsoft/TypeScript/issues/15478

[asfernandes]

But if I didn't did a mistake, I tested with Typescript 2.1 and 2.2 and still saw the bug.

[vslinko]

@asfernandes please try [email protected]

[kulshekhar]

@asfernandes I just tried this with [email protected] and it passed the test.