[API reference](https://evolu.dev/docs/api-reference) › [@evolu/sqlite-wasm](https://evolu.dev/docs/api-reference/sqlite-wasm) › [c-api](https://evolu.dev/docs/api-reference/sqlite-wasm/c-api) › sqlite3\_index\_constraint\_usage\_layout

```ts
const sqlite3_index_constraint_usage_layout: {
  members: {
    argvIndex: {
      offset: 0;
      signature: "i";
    };
    omit: {
      offset: 4;
      signature: "C";
    };
  };
  sizeof: 8;
};
```

Defined in: [packages/sqlite-wasm/src/Constants.ts:777](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L777)

The layout of `sqlite3_index_constraint_usage` in this wasm build.

## Type Declaration

| Name                                    | Type                                                                                                           | Default value | Defined in                                                                                                                                                             |
| --------------------------------------- | -------------------------------------------------------------------------------------------------------------- | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| <a id="property-members"></a> `members` | \{ `argvIndex`: \{ `offset`: `0`; `signature`: `"i"`; \}; `omit`: \{ `offset`: `4`; `signature`: `"C"`; \}; \} | -             | [packages/sqlite-wasm/src/Constants.ts:779](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L779) |
| `members.argvIndex`                     | \{ `offset`: `0`; `signature`: `"i"`; \}                                                                       | -             | [packages/sqlite-wasm/src/Constants.ts:780](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L780) |
| `members.argvIndex.offset`              | `0`                                                                                                            | `0`           | [packages/sqlite-wasm/src/Constants.ts:780](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L780) |
| `members.argvIndex.signature`           | `"i"`                                                                                                          | `"i"`         | [packages/sqlite-wasm/src/Constants.ts:780](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L780) |
| `members.omit`                          | \{ `offset`: `4`; `signature`: `"C"`; \}                                                                       | -             | [packages/sqlite-wasm/src/Constants.ts:781](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L781) |
| `members.omit.offset`                   | `4`                                                                                                            | `4`           | [packages/sqlite-wasm/src/Constants.ts:781](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L781) |
| `members.omit.signature`                | `"C"`                                                                                                          | `"C"`         | [packages/sqlite-wasm/src/Constants.ts:781](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L781) |
| <a id="property-sizeof"></a> `sizeof`   | `8`                                                                                                            | `8`           | [packages/sqlite-wasm/src/Constants.ts:778](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/sqlite-wasm/src/Constants.ts#L778) |