Support for angular 9

[filipefreitas82]

After updating angular to version 9 we get this error:

ERROR in node_modules/json-typescript-mapper/index.ts:187:13 - error TS2536: Type 'string' cannot be used to index type 'T'.

187 instance[key] = decoratorMetaData.customConverter.fromJson(json[decoratorMetaData.name || key]);

[decline]

This is because Angular 9 now requires a higher typescript version. I also faced this error when I migrated Angular to the latest 8.2 version.

Setting typescript back from "typescript": "~3.5.3" to "typescript": "~3.4.5" fixed it for me, but of course this is not a long-term solution...

I think about abandoning the json-typescript-mapper package completely since it doesn't seem to be maintained anymore 🙁

[filipefreitas82]

@decline
For us downgrading typescript is not an option since angular 9 doesn't support those versions.
We ended up forking this package and fixed the compile error. The solution is far from ideal because we lost the class mapping in some cases.

[jonghshin]

I'm having the same issue, and this is not fixed yet.
I'm using Angular 10.