TypeScript error TS2351 with validator.ts

[clayroach]

jsonforms version 2.1.0
typescript 3.2.2
webpack 4.28.2

ERROR in [blah]/uiproject/node_modules/@jsonforms/core/src/util/validator.ts
ERROR in [blah]/uiproject/node_modules/@jsonforms/core/src/util/validator.ts(5,15):
TS2351: Cannot use 'new' with an expression whose type lacks a call or construct signature.

To Reproduce
Compile project with webpack.

Expected behavior
No error

Proposed solution
Change import from:
import * as AJV from 'ajv';

To:
import Ajv from 'ajv';

[edgarmueller]

Thanks for the report, I guess we should avoid wildcard imports altogether. We'll try to address this issue in the upcoming sprint.

[clayroach]

Weirdly... the issue went away once I blew away the package-lock.json so some other library was causing this issue to manifest itself.

[clayroach]

@edgarmueller - Can you please consider getting this one fixed in the 2.2.0 version? It came back for no good reason whatsoever, and now it is breaking all our builds unless we all individually patching this file.

[edgarmueller]

Alright we'll try to have a look.

[clayroach]

Thanks @edgarmueller. Note that the following is what has resolved the issue, (capital AJV, not Ajv)

import AJV from 'ajv';

[edgarmueller]

@clayroach Could the issue be related to different compiler settings, i.e. do you have allowSyntheticDefaultImports and/or esModuleInpterop set? We opened #1242 and updated our tsconfig (https://github.com/eclipsesource/jsonforms/pull/1242/files#diff-bd08939a7f74f60ccd2a7d92682b57be), which hopefully should then fix your issue.

[edgarmueller]

We have released a pre-release 2.1.1-alpha.3, which contains #1242, i.e. the esModuleInterop flag is now set. Could you give it a try and let us know whether this solves your issue?

[clayroach]

Yes, will do!

[clayroach]

@edgarmueller Looks that resolved it! Thanks.