> ## Documentation Index
> Fetch the complete documentation index at: https://wb-21fd5541-docs-2516.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# op

> TypeScript SDK reference

export const GitHubLink = ({url, compact = false}) => <a href={url} target="_blank" rel="noopener noreferrer" className={compact ? "source-link" : "github-source-link"}>
    {compact ? "View source" : <>
    <svg width="20" height="20" viewBox="0 0 24 24" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
      <path d="M12 0C5.37 0 0 5.37 0 12c0 5.31 3.435 9.795 8.205 11.385.6.105.825-.255.825-.57 0-.285-.015-1.23-.015-2.235-3.015.555-3.795-.735-4.035-1.41-.135-.345-.72-1.41-1.23-1.695-.42-.225-1.02-.78-.015-.795.945-.015 1.62.87 1.845 1.23 1.08 1.815 2.805 1.305 3.495.99.105-.78.42-1.305.765-1.605-2.67-.3-5.46-1.335-5.46-5.925 0-1.305.465-2.385 1.23-3.225-.12-.3-.54-1.53.12-3.18 0 0 1.005-.315 3.3 1.23.96-.27 1.98-.405 3-.405s2.04.135 3 .405c2.295-1.56 3.3-1.23 3.3-1.23.66 1.65.24 2.88.12 3.18.765.84 1.23 1.905 1.23 3.225 0 4.605-2.805 5.625-5.475 5.925.435.375.81 1.095.81 2.22 0 1.605-.015 2.895-.015 3.3 0 .315.225.69.825.57A12.02 12.02 0 0024 12c0-6.63-5.37-12-12-12z" />
    </svg>
    GitHub source
      </>}
  </a>;

## Call Signature

```ts theme={null}
op<T>(fn: T, options?: object): Op<T>
```

<GitHubLink url="https://github.com/wandb/weave/blob/7c9efdc9fe05ffcaf2430dd652ef9bc5b3ffdfaa/sdks/node/src/op.ts#L392" />

### Type Parameters

<ParamField path="T" type="extends (...args) => any" />

### Parameters

<ParamField path="fn" type="T" required />

<ParamField path="options" type="object">
  <Expandable title="properties" defaultOpen>
    <ParamField path="attributes" type="Record<string, any>">
      Default attributes applied to every call this op creates. Integrations set
      this to stamp `attributes.integration` provenance. Merged beneath `kind`/
      `color`, which take precedence on key collision.
    </ParamField>

    <ParamField path="bindThis" type="WeaveObject">
      See [`WeaveObject`](../classes/weaveobject).
    </ParamField>

    <ParamField path="callDisplayName" type="(...args) => string" />

    <ParamField path="isDecorator" type="boolean" />

    <ParamField path="name" type="string" />

    <ParamField path="opColor" type="string">
      Custom color for the operation in the UI
    </ParamField>

    <ParamField path="opKind" type="string">
      The kind of operation (e.g., 'llm', 'agent', 'tool', 'search') for UI categorization
    </ParamField>

    <ParamField path="originalFunction" type="T" />

    <ParamField path="parameterNames" type="&#x22;useParam0Object&#x22; | string[]" />

    <ParamField path="shouldAdoptThis" type="boolean" />

    <ParamField path="streamReducer" type="object">
      Full type: `{ finalizeFn: (state) => void; initialStateFn: () => any; reduceFn: (state, chunk) => any; }`

      <Expandable title="properties" defaultOpen>
        <ParamField path="finalizeFn" type="(state) => void" required />

        <ParamField path="initialStateFn" type="() => any" required />

        <ParamField path="reduceFn" type="(state, chunk) => any" required />
      </Expandable>
    </ParamField>

    <ParamField path="summarize" type="(result) => Record<string, any>" />
  </Expandable>
</ParamField>

### Returns

[`Op`](../type-aliases/op)\<`T`>

## Call Signature

```ts theme={null}
op<T>(thisArg: any, fn: T, options?: object): Op<T>
```

### Type Parameters

<ParamField path="T" type="extends (...args) => any" />

### Parameters

<ParamField path="thisArg" type="any" required />

<ParamField path="fn" type="T" required />

<ParamField path="options" type="object">
  <Expandable title="properties" defaultOpen>
    <ParamField path="attributes" type="Record<string, any>">
      Default attributes applied to every call this op creates. Integrations set
      this to stamp `attributes.integration` provenance. Merged beneath `kind`/
      `color`, which take precedence on key collision.
    </ParamField>

    <ParamField path="bindThis" type="WeaveObject">
      See [`WeaveObject`](../classes/weaveobject).
    </ParamField>

    <ParamField path="callDisplayName" type="(...args) => string" />

    <ParamField path="isDecorator" type="boolean" />

    <ParamField path="name" type="string" />

    <ParamField path="opColor" type="string">
      Custom color for the operation in the UI
    </ParamField>

    <ParamField path="opKind" type="string">
      The kind of operation (e.g., 'llm', 'agent', 'tool', 'search') for UI categorization
    </ParamField>

    <ParamField path="originalFunction" type="T" />

    <ParamField path="parameterNames" type="&#x22;useParam0Object&#x22; | string[]" />

    <ParamField path="shouldAdoptThis" type="boolean" />

    <ParamField path="streamReducer" type="object">
      Full type: `{ finalizeFn: (state) => void; initialStateFn: () => any; reduceFn: (state, chunk) => any; }`

      <Expandable title="properties" defaultOpen>
        <ParamField path="finalizeFn" type="(state) => void" required />

        <ParamField path="initialStateFn" type="() => any" required />

        <ParamField path="reduceFn" type="(state, chunk) => any" required />
      </Expandable>
    </ParamField>

    <ParamField path="summarize" type="(result) => Record<string, any>" />
  </Expandable>
</ParamField>

### Returns

[`Op`](../type-aliases/op)\<`T`>

## Call Signature

```ts theme={null}
op(target: object, propertyKey: string | symbol, descriptor: TypedPropertyDescriptor<any>): TypedPropertyDescriptor<any>
```

### Parameters

<ParamField path="target" type="object" required />

<ParamField path="propertyKey" type="string | symbol" required />

<ParamField path="descriptor" type="TypedPropertyDescriptor<any>" required />

### Returns

`TypedPropertyDescriptor`\<`any`>

## Call Signature

```ts theme={null}
op<T>(value: T, context: object): Op<T>
```

### Type Parameters

<ParamField path="T" type="extends (...args) => any" />

### Parameters

<ParamField path="value" type="T" required />

<ParamField path="context" type="object" required>
  <Expandable title="properties" defaultOpen>
    <ParamField path="access" type="{ get: Function; has: boolean; }">
      <Expandable title="properties" defaultOpen>
        <ParamField path="get" required />

        <ParamField path="has" required />
      </Expandable>
    </ParamField>

    <ParamField path="class" type="Function" />

    <ParamField path="kind" type="&#x22;method&#x22;" required />

    <ParamField path="metadata" type="any" />

    <ParamField path="name" type="string | symbol" required />

    <ParamField path="private" type="boolean" />

    <ParamField path="static" type="boolean" />

    <ParamField path="addInitializer" />
  </Expandable>
</ParamField>

### Returns

[`Op`](../type-aliases/op)\<`T`>

## Call Signature

```ts theme={null}
op(options: Partial<OpOptions<any>>): MethodDecorator
```

### Parameters

<ParamField path="options" type="Partial<OpOptions<any>>" required />

### Returns

`MethodDecorator`