Type error to do with BaseLanguageModel and CallOptions

[5-tom]

Introduced here I believe: #3709

0.0.203 is a working version.

Stack trace:

node_modules/@langchain/core/dist/language_models/base.d.ts:122:31 - error TS2420: Class 'BaseLanguageModel<RunOutput, CallOptions>' incorrectly implements interface 'BaseLanguageModelInterface<RunOutput, CallOptions>'.
  Property 'CallOptions' is missing in type 'BaseLanguageModel<RunOutput, CallOptions>' but required in type 'BaseLanguageModelInterface<RunOutput, CallOptions>'.

122 export declare abstract class BaseLanguageModel<RunOutput = any, CallOptions extends BaseLanguageModelCallOptions = BaseLanguageModelCallOptions> extends BaseLangChain<BaseLanguageModelInput, RunOutput, CallOptions> implements BaseLanguageModelParams, BaseLanguageModelInterface<RunOutput, CallOptions> {
                                  ~~~~~~~~~~~~~~~~~

  node_modules/@langchain/core/dist/language_models/base.d.ts:104:62
    104 export interface BaseLanguageModelInterface<RunOutput = any, CallOptions extends BaseLanguageModelCallOptions = BaseLanguageModelCallOptions> extends RunnableInterface<BaseLanguageModelInput, RunOutput, CallOptions> {
                                                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    'CallOptions' is declared here.


Found 1 error in node_modules/@langchain/core/dist/language_models/base.d.ts:122

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[YarivLevy81]

I'm having the same issue, can't use latest version. any workaround besides of using 0.0.203?

[vinayr]

Workaround: Add "skipLibCheck": true to your tsconfig.json

{
  "compilerOptions": {
    .....
    "skipLibCheck": true,
  }
}

[mieslep]

having same problem, using workaround. FYI @jacoblee93 something strange going on here...

[jacoblee93]

Thanks for the heads up and sorry for missing this - the workaround is good but is there a code example/package.json/tsconfig.json that I can use to repro this?

If you have multiple packages installed do the instructions here fix it?

https://js.langchain.com/docs/get_started/installation#installing-integration-packages

[jacoblee93]

@mieslep perhaps?

[5-tom]

Thanks for the heads up and sorry for missing this - the workaround is good but is there a code example/package.json/tsconfig.json that I can use to repro this?

If you have multiple packages installed do the instructions here fix it?

https://js.langchain.com/docs/get_started/installation#installing-integration-packages

I've had no luck following the linked instructions. Here's what you can use to reproduce the errors:

package.json

{
	"type": "module",
	"scripts": {
		"broken": "tsc -m nodenext main.ts",
		"works": "tsc -m nodenext --skipLibCheck main.ts"
	},
	"dependencies": {
		"@langchain/openai": "latest"
	},
	"devDependencies": {
		"typescript": "latest"
	}
}

main.ts

import { ChatOpenAI } from "@langchain/openai";

[jacoblee93]

How about a tsconfig.json` file @5-tom?

And it doesn't look like you have langchain installed?

Edit: Never mind, I am able to repro with tsc.

I see:

node_modules/@langchain/core/dist/language_models/base.d.ts:130:31 - error TS2420: Class 'BaseLanguageModel<RunOutput, CallOptions>' incorrectly implements interface 'BaseLanguageModelInterface<RunOutput, CallOptions>'.
  Property 'CallOptions' is missing in type 'BaseLanguageModel<RunOutput, CallOptions>' but required in type 'BaseLanguageModelInterface<RunOutput, CallOptions>'.

130 export declare abstract class BaseLanguageModel<RunOutput = any, CallOptions extends BaseLanguageModelCallOptions = BaseLanguageModelCallOptions> extends BaseLangChain<BaseLanguageModelInput, RunOutput, CallOptions> implements BaseLanguageModelParams, BaseLanguageModelInterface<RunOutput, CallOptions> {
                                  ~~~~~~~~~~~~~~~~~

  node_modules/@langchain/core/dist/language_models/base.d.ts:104:62
    104 export interface BaseLanguageModelInterface<RunOutput = any, CallOptions extends BaseLanguageModelCallOptions = BaseLanguageModelCallOptions> extends RunnableInterface<BaseLanguageModelInput, RunOutput, CallOptions> {
                                                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    'CallOptions' is declared here.

node_modules/@langchain/core/dist/utils/stream.d.ts:1:18 - error TS2320: Interface 'IterableReadableStreamInterface<T>' cannot simultaneously extend types 'ReadableStream<T>' and 'AsyncGenerator<T, any, unknown>'.
  Named property '[Symbol.asyncIterator]' of types 'ReadableStream<T>' and 'AsyncGenerator<T, any, unknown>' are not identical.

1 export interface IterableReadableStreamInterface<T> extends ReadableStream<T>, AsyncGenerator<T> {
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

node_modules/@langchain/core/dist/utils/stream.d.ts:9:5 - error TS2425: Class 'ReadableStream<T>' defines instance member property '[Symbol.asyncIterator]', but extended class 'IterableReadableStream<T>' defines it as instance member function.

9     [Symbol.asyncIterator](): this;
      ~~~~~~~~~~~~~~~~~~~~~~

[jacoblee93]

I think #3953 fixes this! Can you try locking your core version to 0.1.11?

I was occasionally able to repro another typing bug caused by a polyfill overriding a global stream in that OpenAI's SDK uses. Please reopen another issue if you see this.