Source: https://tanstack.com/db/latest/docs/reference/interfaces/Context

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On this page

• Interface: Context

• Properties

• baseSchema

• fromSourceName

• hasJoins?

• joinTypes?

• result?

• schema

• singleResult?

Context

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Interface: Context
==================

Defined in: packages/db/src/query/builder/types.ts:35

Context - The central state container for query builder operations

This interface tracks all the information needed to build and type-check queries:

Schema Management:

• baseSchema: The original tables/collections from the from() clause
• schema: Current available tables (expands with joins, contracts with subqueries)

Query State:

• fromSourceName: Which table was used in from() - needed for optionality logic
• hasJoins: Whether any joins have been added (affects result type inference)
• joinTypes: Maps table aliases to their join types for optionality calculations

Result Tracking:

• result: The final shape after select() - undefined until select is called

The context evolves through the query builder chain:

1. from() sets baseSchema and schema to the same thing
2. join() expands schema and sets hasJoins/joinTypes
3. select() sets result to the projected shape

Properties
---------- ### baseSchema

ts

baseSchema: ContextSchema;


baseSchema: ContextSchema;

Defined in: packages/db/src/query/builder/types.ts:37

---

### fromSourceName

ts

fromSourceName: string;


fromSourceName: string;

Defined in: packages/db/src/query/builder/types.ts:41

---

### hasJoins?

ts

optional hasJoins: boolean;


optional hasJoins: boolean;

Defined in: packages/db/src/query/builder/types.ts:43

---

### joinTypes?

ts

optional joinTypes: Record<string, "inner" | "left" | "right" | "full" | "outer" | "cross">;


optional joinTypes: Record<string, "inner" | "left" | "right" | "full" | "outer" | "cross">;

Defined in: packages/db/src/query/builder/types.ts:45

---

### result?

ts

optional result: any;


optional result: any;

Defined in: packages/db/src/query/builder/types.ts:50

---

### schema

ts

schema: ContextSchema;


schema: ContextSchema;

Defined in: packages/db/src/query/builder/types.ts:39

---

### singleResult?

ts

optional singleResult: boolean;


optional singleResult: boolean;

Defined in: packages/db/src/query/builder/types.ts:52

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