jest-diff error running "npm run webpack:prod"

[ecirilo]

Describe the bug
Doing an npm run webpack:prod in server folder of a generated app shows the import errors:

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts(10,13)
TS1005: '=' expected.

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts(10,34)
TS1005: ';' expected.

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts(11,1)
TS1128: Declaration or statement expected.

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts(11,13)
TS1005: ';' expected.

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/index.d.ts(11,52)
TS1005: ';' expected.

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/diffLines.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/diffLines.d.ts(8,13)
TS1005: '=' expected.

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/diffLines.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/diffLines.d.ts(8,34)
TS1005: ';' expected.

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/printDiffs.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/printDiffs.d.ts(8,13)
TS1005: '=' expected.

ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/printDiffs.d.ts
[tsl] ERROR in /Users/elder/Programming/oomenu/backoffice/server/node_modules/jest-diff/build/printDiffs.d.ts(8,57)
TS1005: ';' expected.

To Reproduce
Steps to reproduce the behavior:

1. Go to server folder
2. Run npm run webpack:prod

Expected behavior
Have the production bundle built with webpack

Desktop (please complete the following information):

• OS: macOs 10.15.4

Additional context
jhipster-nodejs v1.0.2

[ghost]

Hi!! Thanks for the interest!
This is a new bug of jest: jestjs/jest#9714 (comment)
I have just fixed that with the following steps:

• Update in your server package.json the jest and @types/jest to 25.2.3 version
• Add in your webpack.server.prod.config.ts the following section:

  externals: {
        '@nestjs/microservices': 'nestjs/microservices',
        'cache-manager': 'cache-manager',
        'fastify-swagger': 'fastify-swagger',
	'aws-sdk': 'aws-sdk',
    },

These steps resolve that. I'm starting a branch on the generator.