Invalid TypeScript generated for maps with long integer keys with forceLong=long

[roboslone]

Original proto:

message Message {
    map<uint64, double> field = 1;
}

Options:

  - enumsAsLiterals=true
  - env=browser
  - forceLong=long
  - oneof=unions
  - outputServices=nice-grpc,outputServices=generic-definitions
  - unrecognizedEnum=false
  - useDate=false

Generated code:

export interface Message {
  field: { [key: Long]: number }; // TS1268: An index signature parameter type must be 'string', 'number', 'symbol', or a template literal type.
}

[stephenh]

Hi @roboslone , I believe this is a duplicate of #708 ? There is a suggested approach in that issue if you'd like to take a crack at fixing this. Thanks!

[roboslone]

Yep, definitely a duplicate.