Typescript compliation issue - Type 'RequestInit' is not assignable to type 'never'

[YaronRosh]

having compilation issue with the @anthropic-ai/bedrock-sdk, using in node js + ts

../node_modules/@anthropic-ai/bedrock-sdk/client.d.ts:45:5 - error TS2416: Property 'buildRequest' in type 'AnthropicBedrock' is not assignable to the same property in base type 'APIClient'.
  Type '{ (options: FinalRequestOptions<unknown>): { req: RequestInit; url: string; timeout: number; }; (options: FinalRequestOptions<unknown>): { ...; }; }' is not assignable to type '<Req>(options: FinalRequestOptions<Req>) => { req: never; url: string; timeout: number; }'.
    Call signature return types '{ req: RequestInit; url: string; timeout: number; }' and '{ req: never; url: string; timeout: number; }' are incompatible.
      The types of 'req' are incompatible between these types.
        Type 'RequestInit' is not assignable to type 'never'.

45     buildRequest(options: Core.FinalRequestOptions<unknown>): {
       ~~~~~~~~~~~~


Found 1 error in ../node_modules/@anthropic-ai/bedrock-sdk/client.d.ts:45

using
@anthropic-ai/bedrock-sdk: 0.9.2
typescript: 5.2.2

[RobertCraigie]

Can you share your tsconfig? This is likely an issue in your config.

[YaronRosh]

{
  "compilerOptions": {
    "outDir": "dist",
     "incremental": true,
    "sourceMap": true,
    "lib": ["esnext", "dom"],
    "jsx": "react",
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "baseUrl": ".",
    "module": "commonjs",
    "rootDir": ".",
    "target": "es6",
    "noImplicitAny": false,
    "moduleResolution": "Node",
    "allowJs": true,
    "resolveJsonModule": true
  },
  "include": [
    "src",
    "__tests__"
  ],
  "exclude": [
    "node_modules",
    "./_isolated_",
    "./workspaces",
    "**/dist"
  ]
}

[rattrayalex]

Can you try "moduleResolution": "nodeNext" instead of "Node"?

If that presents other challenges for you, you can try adding this line before your first import of the package:

import '@anthropic-ai/sdk/shims/node'

More information here: https://github.com/anthropics/anthropic-sdk-typescript/tree/main/src/_shims#readme

[YaronRosh]

it now fails on something else
with or without the shim
import '@anthropic-ai/sdk/shims/node'

../node_modules/@anthropic-ai/bedrock-sdk/client.d.ts:41:15 - error TS2416: Property 'prepareRequest' in type 'AnthropicBedrock' is not assignable to the same property in base type 'APIClient'.
  Type '(request: RequestInit, { url, options }: { url: string; options: import("/Users/yaronrosh/logzio/gaia-hermes-ws/node_modules/@anthropic-ai/sdk/core").FinalRequestOptions<unknown>; }) => Promise<...>' is not assignable to type '(request: import("/Users/yaronrosh/logzio/gaia-hermes-ws/node_modules/@types/node-fetch/index").RequestInit, { url, options }: { url: string; options: import("/Users/yaronrosh/logzio/gaia-hermes-ws/node_modules/@anthropic-ai/sdk/core").FinalRequestOptions<unknown>; }) => Promise<...>'.
    Types of parameters 'request' and 'request' are incompatible.
      Type 'import("/node_modules/@types/node-fetch/index").RequestInit' is not assignable to type 'RequestInit'.
        Types of property 'body' are incompatible.
          Type 'import("/node_modules/@types/node-fetch/index").BodyInit' is not assignable to type 'BodyInit'.
            Type 'ReadableStream' is not assignable to type 'BodyInit'.
              Type 'ReadableStream' is missing the following properties from type 'ReadableStream<any>': locked, cancel, getReader, pipeThrough, and 3 more.

41     protected prepareRequest(request: RequestInit, { url, options }: {
                 ~~~~~~~~~~~~~~

../node_modules/@anthropic-ai/bedrock-sdk/client.d.ts:45:5 - error TS2416: Property 'buildRequest' in type 'AnthropicBedrock' is not assignable to the same property in base type 'APIClient'.
  Type '(options: FinalRequestOptions<unknown>) => { req: RequestInit; url: string; timeout: number; }' is not assignable to type '<Req>(options: FinalRequestOptions<Req>) => { req: RequestInit; url: string; timeout: number; }'.
    Call signature return types '{ req: RequestInit; url: string; timeout: number; }' and '{ req: RequestInit; url: string; timeout: number; }' are incompatible.
      The types of 'req.body' are incompatible between these types.
        Type 'BodyInit' is not assignable to type 'import("/Users/yaronrosh/logzio/gaia-hermes-ws/node_modules/@types/node-fetch/index").BodyInit'.
          Type 'Blob' is not assignable to type 'BodyInit'.
            Type 'Blob' is missing the following properties from type 'URLSearchParams': append, delete, entries, forEach, and 8 more.

45     buildRequest(options: Core.FinalRequestOptions<unknown>): {
       ~~~~~~~~~~~~

[rattrayalex]

Got it. Does "moduleResolution": "nodeNext"help?

[amosd92]

Answering on behalf of Yaron, it didn't help as well.

[rattrayalex]

hmm… that's surprising. Can you share a codesandbox with minimal repro?