Type error in `rest-api/helpers.ts`

[fjcalzado]

An error is preveting the pending pull requests to pass travis integration successfully. It seems a type error in rest-api/helpers.ts. See full trace below:

ERROR in [at-loader] ./src/rest-api/helpers.ts:12:14 
    TS2322: Type '{ method: string; mode: RequestMode; credentials: RequestCredentials; headers: { 'Accept': string...' is not assignable to type 'Partial<RequestInit>'.
  Types of property 'headers' are incompatible.
    Type '{ 'Accept': string; 'Content-Type': string; }' is not assignable to type 'Headers | string[][]'.
      Type '{ 'Accept': string; 'Content-Type': string; }' is not assignable to type 'string[][]'.
        Property 'length' is missing in type '{ 'Accept': string; 'Content-Type': string; }'.

[brauliodiez]

@nasdan can you take a look?

[fjcalzado]

The weird thing is that it passes local compilation (build and also build:prod) successfully, no errors. However, typescript screams the error in VS Code:

Does the travis build do something different ?

[brauliodiez]

I think it's an issue with typings if you wipe node_modules and reinstall it will fail.

@crsanti experienced a.similar issue in other project.

Quick work around fix versions remove the "gorrito" ;)

[fjcalzado]

Typescript@2.6.1 seems to be the problem, travis is resolving to that version while locally targets to typescript@2.4.2. Same package.json but different versions installed 😣.

[brauliodiez]

We have to upate.typescript to latest stable then try to fix

[nasdan]

Yes, it's about typescript update. To solve It:

headers: new Headers({
    'Accept': 'application/json',
    'Content-Type': 'application/json',
  }),

In method base