Encountering Typescript issues following the transition from npm to pnpm

Currently, I am facing a challenge in migrating an outdated Angular JS project from npm to pnpm. The main issue I am encountering is related to typescript errors, particularly the error message that states:

error TS2339: Property 'mock' does not exist on type 'IAngularStatic'
. With npm, the typescript transpile runs smoothly, and I aim to maintain this efficiency.

Here is a glimpse of my tsconfig.json:

{
  "compilerOptions": {
    "baseUrl": ".",
    "module": "commonjs",
    "target": "ES2017",
    "sourceMap": true,
    "inlineSources": true,
    "allowSyntheticDefaultImports": true
  },
  "exclude":
    [
      "node_modules"
    ]
}

I have attempted to include

import "angular"; import "angular-mocks"
as well as
import "@types/angular"; import "@types/angular-mocks"
, but it resulted in another error:
error TS2686: 'angular' refers to a UMD global, but the current file is a module. Consider adding an import instead.

Additionally, I have experimented with different hoisting options, albeit somewhat haphazardly due to my limited understanding of it.

Any assistance or guidance in the right direction would be greatly appreciated.

Edit: Just for clarification, running the following commands,

rm -rf node_modules
rm package-lock.json pnpm-lock.yaml npm-shrinkwrap.json
npm i --ignore-scripts
tsc

produces no errors (although it is time-consuming); however, executing

rm -rf node_modules
rm package-lock.json pnpm-lock.yaml npm-shrinkwrap.json
pnpm i --ignore-scripts
tsc

quickly generates around 170 tsc errors, most of which are TS2339 errors.

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