SPFx 1.18 scaffolded with --use-heft does not compile because of missing @types/heft-jest package

[ltdu]

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

Windows

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• SPFx 1.18 rc1
• Node.js v16.20.2
• pnpm 7.32.5

Describe the bug / error

New SPFx v1.18 project scaffolded with --use-heft uses TS configuration, which requires @types/heft-jest package. Trying to build such project results in following error message:

PS C:\Solutions\Experiments\spfx-1.18-rc1-patched> pnpm build

> spfx-1-18-rc-1-patched@0.0.1 build C:\Solutions\Experiments\spfx-1.18-rc1-patched
> heft test --clean

 ---- build started ----
[build:clean] Deleted 1 file and 3 folders
[build:sass] Generating sass typings...
[build:sass] Generated sass typings
[build:typescript] Using TypeScript version 4.7.4
[build:typescript] Encountered 1 TypeScript issue:
[build:typescript] Error: Cannot find type definition file for 'heft-jest'.
[build:typescript]   The file is in the program because:
[build:typescript]     Entry point of type library 'heft-jest' specified in compilerOptions
[build:lint] Using ESLint version 8.7.0
....

Steps to reproduce

1. Create new project with --use-heft

pnpm --package yo@latest --package @microsoft/generator-sharepoint@next dlx yo @microsoft/sharepoint@next --skip-install --package-manager pnpm --use-heft 

2. Follow series of question to build your SPFx project of choice (I used simple WebPart with React)
3. Install dependencies

pnpm install

4. Build project

pnpm run build

Note: currently build does not work without some additional work (see: #9073)

Expected behavior

It should be possible to build new project without any additional steps and error messages. At the moment it is required to add this dependency manually:

pnpm add @types/heft-jest --save-dev

Thank you for reporting this issue. We will be triaging your incoming issue as soon as possible.

[AJIXuMuK]

@ltdu please, see the comment in #9073

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