Describe the Bug

I would like to use a custom webpack typescript config with the define plugin but cannot import package.json. Which tsconfig is taken by angular-builders for the webpack config compilation? I tried adding that file to every webpack config without success.

webpack.config.ts:7:22 - error TS2732: Cannot find module './package.json'. Consider using '--resolveJsonModule' to import module with '.json' extension

7 import * as pkg from './package.json'

Minimal Reproduction

1. Create a start
2. Include @angular-builders/custom-webpack:browser
3. Create a webpack.config.ts
4. Add package.json as a module
5. Run npm run build

https://github.com/muuvmuuv/angular-builders-issues-816

Expected Behavior

A clear and concise description of what you expected to happen.

Screenshots

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Environment

Libs
- @angular/core version: 10.0.10
- @angular-devkit/build-angular version: 0.1000.6
- @angular-builders/custom-webpack version: 10

For Tooling issues:
- Node version: 12.18.0
- Platform: latest macOS

Others:

Additional Context

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