error TS1086: An accessor cannot be declared in an ambient context

[tvaher]

Related issues

Here is quite similar problem, but solution is not suitable in this case (update to typescript 3.8.2).
#667

[REQUIRED] Version info

node:

12.6.0

firebase-functions:

3.0.0

firebase-tools:

7.0.2

firebase-admin:
8.0.0

[REQUIRED] Test case

Run command:
ng serve

Error described occurs (see log).

[REQUIRED] Steps to reproduce

I updated firebase-tools from version 7.0.2 to 8.9.0 and also typescript to version 3.8.2 and managed to upload function to firestore. Then I run ng serve and got following error:
ERROR in functions/node_modules/firebase-functions/lib/apps.d.ts(26,13): error TS1086: An accessor cannot be declared in an ambient context.

[REQUIRED] Expected behavior

At this moment I can't use newer version of typescript because Angular version and dependencies. I downgraded firebase-tools back to 7.0.2 and typescript back to 3.4.5, but error still exists, when trying to compile and serve. Is there somekind of solution for this.

[REQUIRED] Actual behavior

When running again ng -serve, error appears. Error points to functions/node_modules/ -libraries.

ERROR in functions/node_modules/firebase-functions/lib/apps.d.ts(26,13): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/apps.d.ts(33,21): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(64,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(77,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(111,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(125,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(132,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(139,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(148,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(161,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(170,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/function-builder.d.ts(176,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(41,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(76,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(116,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(150,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(163,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(176,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(212,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(233,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(255,9): error TS1086: An accessor cannot be declared in an ambient context.
functions/node_modules/firebase-functions/lib/handler-builder.d.ts(268,9): error TS1086: An accessor cannot be declared in an ambient context.

Were you able to successfully deploy your functions?

Function was deployed successfully, but error occurs despite downgrading typescript and firebase-tools.

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[tvaher]

Only way was to update Angular, Angular dependencies, typescript and firebase-tools carefully. I'll close this issue.