Optional chaining and nullish coalescing not working anymore

[linjie997]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

Is this a regression?

Yes, the previous version in which this bug was not present was: 9.1.0

Description

After upgrading from 9.1.0 to 9.1.1, optional chaining and nullish coalescing are not working anymore.
At a first glance it looks like a downgrade of typescript version?

🔬 Minimal Reproduction

https://stackblitz.com/edit/angular-bt9hvm

🔥 Exception or Error

Error in src/app/app.component.ts (20:30)
Expression expected.

🌍 Your Environment

  "dependencies": {
    "@angular/animations": "^9.1.2",
    "@angular/common": "~9.1.2",
    "@angular/compiler": "~9.1.2",
    "@angular/core": "^9.1.2",
    "@angular/forms": "~9.1.2",
    "@angular/platform-browser": "~9.1.2",
    "@angular/platform-browser-dynamic": "~9.1.2",
    "@angular/router": "~9.1.2",
    "core-js": "^3.6.4",
    "rxjs": "~6.5.5",
    "tslib": "^1.10.0",
    "zone.js": "^0.10.3"
  },

  "devDependencies": {
    "@angular-devkit/build-angular": "~0.901.1",
    "@angular/cli": "^9.1.1",
    "@angular/compiler-cli": "~9.1.2",
    "@angular/language-service": "~9.1.2",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^12.11.1",
    "codelyzer": "~4.5.0",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~3.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.11.0",
    "typescript": "~3.7.5"
  }

Anything else relevant?
May related to #17320.

From my understanding, Angular still uses typescript 3.7+ (from this comment), so this should be working.

[alan-agius4]

Hi @linjie997, I download the StackBlitz project and tried to run locally. I wasn't able to reproduce the error.

Seems to me that StackBlitz might be using a TypeScript version which is different from the one specified in the package.json.

Mind opening an issue here: https://github.com/stackblitz/core/issues

Thanks.

[destus90]

@linjie997
This rather looks like the StackBlitz issue stackblitz/core#483 (comment)

[linjie997]

Hi, first of all thank you for your fast responses.
This was indeed a StackBlitz issue.

Second, I was facing the same issue locally on another project. At the end of the day, I deleted the whole project folder, fresh cloned from my git repository and it's working correctly. I guess there was something "dirty" with my node modules which caused this issue.

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