ts-jest-es2017-debugger-repro

Repro repo for debugger issue with TS compilerOptions.target "es2017" and ts-jest@20.0.x

Note: A temporary fix is in this commit, while the permanent fix is in this one

Steps to reproduce:

yarn or npm install to install dependencies
npm run test to build and run tests, notice that coverage is 100%
Open the project in VSCode, go to Debug and run "Debug Tests"
Notice that the build task runs and debugger stops one line after debugger; statement as shown in the screen recording below

Tested with:

Name		Name	Last commit message	Last commit date
Latest commit History 12 Commits
.vscode		.vscode
src		src
.gitignore		.gitignore
.travis.yml		.travis.yml
README.md		README.md
package.json		package.json
screenRecording.gif		screenRecording.gif
tsconfig.json		tsconfig.json

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