TS1086 An accessor cannot be declared in ambient context

Question

I have a thousands of this error after initial implementation nad typing in terminal ng serve my-app of and i can t resolve it  This is first time for me when i have problem like this inside angular with typescript Errors looks like this      ERROR in         node modules  angular flex-layout core typings base base2 d ts 24 19   - error TS1086  An accessor cannot be declared in an ambient context   24     protected get parentElement    HTMLElement   null                                           node modules  angular flex-layout core typings base base2 d ts 26 19       - error TS1086  An accessor cannot be declared in an ambient context   26     protected get nativeElement    HTMLElement                                           node modules  angular flex-layout core typings base base2 d ts 28 9       - error TS1086  An accessor cannot be declared in an ambient context   28     get activatedValue    string                                  node modules  angular flex-layout core typings base base2 d ts 29 9       - error TS1086  An accessor cannot be declared in an ambient context   29     set activatedValue value  string                                   node modules  angular flex-layout core typings breakpoints break-point-registry d ts 20 9       - error TS1086  An accessor cannot be declared in an ambient context                Does somebody know a reason  I can t test my app until I fix it   Update 1  Okay  i make it forward  Most of errors is gone  but i have few ones now  for example first of them      ERROR in src app main main component ts 143 63 - error TS2322  Type    string   undefined  is not assignable to type  string     Type    undefined  is not assignable to type  string        143     this fileService add   isFolder  true  name  folder name    parent  this currentRoot   this currentRoot id    root        Code looks like this   main component ts   currentRoot  MpFileElement   new MpFileElement            addFolder folder    name  string              this fileService add   isFolder  true  name  folder name  parent       this currentRoot   this currentRoot id    root              this updateFileElementQuery                file service ts   import   Injectable   from   angular core    import   v4   from  uuid   import   MpFileElement   from     models mp-file-element model   import   Observable   from  rxjs internal Observable   import   BehaviorSubject   from  rxjs    export interface IFileService       add fileElement  MpFileElement       delete id  string       update id  string  update  Partial lt MpFileElement gt        queryInFolder folderId  string   Observable lt MpFileElement   gt       get id  string   MpFileElement      Injectable   export class MpFileService implements IFileService        constructor          private map   new Map lt string  MpFileElement gt         private querySubject  BehaviorSubject lt MpFileElement   gt        add fileElement  MpFileElement            fileElement id   v4            this map set fileElement id  this clone fileElement            return fileElement             delete id  string            this map delete id              update id  string  update  Partial lt MpFileElement gt             let element   this map get id           element   Object assign element  update           this map set element id  element             queryInFolder folderId  string            const result  MpFileElement                 this map forEach element   gt                if  element parent     folderId                    result push this clone element                                     if   this querySubject                this querySubject   new BehaviorSubject result             else               this querySubject next result                     return this querySubject asObservable               get id  string            return this map get id              clone element  MpFileElement            return JSON parse JSON stringify element

User · Answer

Setting  skipLibCheck   true in tsconfig json solved my problem   compilerOptions          skipLibCheck   true

User · Answer

I ve updated typescript and tslint versions and removed packages I wasn t using  This solved the problem for me  As others pointed here  it seems to be an issue with different TypeScript versions where the generated typings from some library aren t compatible with your TypeScript version

User · Answer

In my case  mismatch of version of two libraries   I am using angular 7 0 0 and installed     swimlane ngx-dnd     8 0 0    and this caused the problem  Reverting this library to     swimlane ngx-dnd    6 0 0    worked for me

User · Answer

Looks like you have recently installed flex-layout package  Try removing this package folder from your node modules folder and reinstalling previous version of this package   Recently  2 days before current date   angular released latest angular-cli version  v9 0 1  due to which many packages are updated to support this latest cli version  In your case you might have old cli version and when you installed this package it was downloaded for latest cli version by default  So try downgrading your package version  Worked for me atleast   Also  dont forget to downgrade the version of your package in package json file

User · Answer

I think that your problem was emerged from typescript and module version mismatch This issue is very similar to your question and answers are very satisfying

User · Answer

Quick solution  Update package json   devDependencies                typescript     3 7 4        In tsconfig json                  angularCompilerOptions                         disableTypeScriptVersionCheck   true           then remove node modules folder and reinstall with      npm install   For more visit here

User · Answer

The best way to overcome on this issue is that  just remove node modules and package-lock json file and further install npm with npm i it solved my problem

User · Answer

try   ng update  angular core  angular cli   Then  just to sync material  run    ng update  angular material

User · Answer

I had this same issue  and these 2 commands saved my life  My underlying problem is that I am always messing up with global install and local install  Maybe you are facing a similar issue  and hopefully running these commands will solve your problem too   ng update --next  angular cli --force npm install typescript latest

User · Answer

If it s just a library that s causing this  this will avoid the problem just fine  Typescript can be a pain on the neck sometimes so set this value on your tsconfig json file   quot compilerOptions quot          quot skipLibCheck quot   true

User · Answer

I got the same issue when adding  angular flex-layout to my Angular 8 project now with    npm install  angular flex-layout --save     This since now that command installed the major 9th version of the flex-layout package  Instead of upgrading everything else to the last version  I solved it by installing the last 8th major version of the package instead    npm install  angular flex-layout 8 0 0-beta 27 --save

User · Answer

I had this error when i deleted several components while the server was on after running the ng serve command   Although i deleted the references from the routes component and module  it didnt solve the problem  Then i followed these steps   Ended the server Restored those files Ran the ng serve command  at this point it solved the error  Ended the server Deleted the components which previously led to the error Ran the ng serve command  At this point no error as well

User · Answer

I was working on a fresh project and got the similar type of problem  I just ran ng update --all and my problem was solved

User · Answer

In my case downgrading  angular animations worked  if you can afford to do that  run the command   npm i  angular animations 6 1 10   Or use another version that might work for you from the Versions tab here  https   www npmjs com package  angular animations

[angular] TS1086: An accessor cannot be declared in ambient context

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