ERROR in TypeError: Cannot read property 'flags' of undefined

🐞 bug report

Affected Package

Unknown，Just upgrade form 9.1.4 to 9.1.5.

Is this a regression?

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

Description

ERROR in TypeError: Cannot read property ‘flags’ of undefined

🔬 Minimal Reproduction

🔥 Exception or Error

Compiling primeng/toast : es2015 as esm2015
Compiling primeng/togglebutton : es2015 as esm2015
Compiling primeng/toolbar : es2015 as esm2015
Compiling primeng/tree : es2015 as esm2015
Compiling primeng/tristatecheckbox : es2015 as esm2015

chunk {main} main.js, main.js.map (main) 1.97 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 661 bytes [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 6.15 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 1.51 MB [initial] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 339 kB [initial] [rendered]
Date: 2020-05-08T02:31:39.787Z - Hash: ce73c7a432145f234c81 - Time: 10711ms

ERROR in TypeError: Cannot read property 'flags' of undefined
    at resolveAlias (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:36513:37)
    at checkAliasSymbol (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:64502:26)
    at checkImportBinding (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:64534:13)
    at checkImportDeclaration (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:64552:29)
    at checkSourceElementWorker (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:64961:28)
    at checkSourceElement (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:64800:17)
    at Object.forEach (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:317:30)
    at checkSourceFileWorker (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:65123:20)
    at checkSourceFile (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:65091:13)
    at getDiagnosticsWorker (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:65179:17)
    at Object.getDiagnostics (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:65165:24)
    at F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:98703:85
    at runWithCancellationToken (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:98665:24)
    at getBindAndCheckDiagnosticsForFileNoCache (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:98691:20)
    at getAndCacheDiagnostics (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:98956:26)
    at getBindAndCheckDiagnosticsForFile (F:\sodic2020\UI\node_modules\typescript\lib\typescript.js:98688:20)

** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **

🌍 Your Environment

Angular Version:

Angular CLI: 9.1.4
Node: 12.16.1
OS: win32 x64

Angular: 9.1.5
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.4
@angular-devkit/build-angular     0.901.4
@angular-devkit/build-optimizer   0.901.4
@angular-devkit/build-webpack     0.901.4
@angular-devkit/core              9.1.4
@angular-devkit/schematics        9.1.4
@angular/cli                      9.1.4
@ngtools/webpack                  9.1.4
@schematics/angular               9.1.4
@schematics/update                0.901.4
rxjs                              6.5.5
typescript                        3.8.3
webpack                           4.42.0

Anything else relevant?

[petebacondarwin]

We have just released 9.1.6 which should not have this problem. Please test.

[magicdict]

Run: npm install @angular/core@9.1.4 @angular/animations@9.1.4 @angular/common@9.1.4 @angular/forms@9.1.4 @angular/platform-browser@9.1.4 @angular/router@9.1.4 @angular/platform-browser-dynamic@9.1.4 @angular/compiler@9.1.4 @angular/compiler-cli@9.1.4 @angular/language-service@9.1.4

ng build

From: https://stackoverflow.com/a/61671596/5157008

just rollback，wait for fix