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snowflake-local-dev-loop Configure Snowflake local development with testing, mocking, and fast iteration.
Use when setting up dev environment, writing tests against Snowflake,
or establishing a fast iteration cycle with SnowSQL and dev warehouses.
Trigger with phrases like "snowflake dev setup", "snowflake local development",
"snowflake dev environment", "develop with snowflake", "snowflake testing".
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Zip 다운로드 다운로드 중... name snowflake-local-dev-loop description Configure Snowflake local development with testing, mocking, and fast iteration.
Use when setting up dev environment, writing tests against Snowflake,
or establishing a fast iteration cycle with SnowSQL and dev warehouses.
Trigger with phrases like "snowflake dev setup", "snowflake local development",
"snowflake dev environment", "develop with snowflake", "snowflake testing".
allowed-tools Read, Write, Edit, Bash(npm:*), Bash(pnpm:*), Grep version 1.5.0 license MIT author Jeremy Longshore <jeremy@intentsolutions.io> tags ["saas","data-warehouse","analytics","snowflake"] compatibility Designed for Claude Code
Snowflake Local Dev Loop
Overview
Set up a fast, reproducible local development workflow for Snowflake with separate dev warehouses, mocked tests, and SnowSQL for rapid iteration.
Prerequisites
Completed snowflake-install-auth setup
Node.js 18+ or Python 3.9+
A dedicated dev warehouse (e.g., DEV_WH_XS) with auto-suspend
Instructions
Step 1: Create Dev-Specific Snowflake Objects
CREATE WAREHOUSE IF NOT EXISTS DEV_WH_XS
WAREHOUSE_SIZE = 'XSMALL'
AUTO_SUSPEND = 60
AUTO_RESUME = TRUE
INITIALLY_SUSPENDED = TRUE ;
CREATE DATABASE IF NOT EXISTS DEV_DB;
CREATE SCHEMA IF NOT EXISTS DEV_DB.SANDBOX;
GRANT USAGE ON WAREHOUSE DEV_WH_XS TO ROLE DEV_ROLE;
GRANT ALL ON DATABASE DEV_DB TO ROLE DEV_ROLE;
Step 2: Project Structure
my-snowflake-project/
├── src/
│ ├── snowflake/
│ │ ├── connection.ts # Connection wrapper with connectAsync
│ │ ├── queries.ts # Typed query functions
│ │ └── types.ts # Row type definitions
│ └── index.ts
├── tests/
│ ├── unit/
│ │ └── queries.test.ts # Mocked — no Snowflake needed
│ └── integration/
│ └── snowflake.test.ts # Requires SNOWFLAKE_* env vars
├── sql/
│ ├── migrations/ # Versioned DDL scripts
│ │ ├── V001__create_users.sql
│ │ └── V002__add_orders.sql
│ └── seeds/
│ └── dev-data.sql # Sample data for dev
├── .env.local # Local secrets (git-ignored)
├── .env.example # Template for team
└── package.json
Step 3: Connection Wrapper with Async/Await
import snowflake from 'snowflake-sdk' ;
snowflake.configure ({ logLevel : 'WARN' });
export function createSnowflakeConnection (return snowflake.createConnection ({
account : process.env .SNOWFLAKE_ACCOUNT !,
username : process.env .SNOWFLAKE_USER !,
password : process.env .SNOWFLAKE_PASSWORD !,
warehouse : process.env .SNOWFLAKE_WAREHOUSE || 'DEV_WH_XS' ,
database : process.env .SNOWFLAKE_DATABASE || 'DEV_DB' ,
schema : process.env .SNOWFLAKE_SCHEMA || 'SANDBOX' ,
role : process.env .SNOWFLAKE_ROLE || 'DEV_ROLE' ,
});
}
export function executeQuery (
conn : snowflake.Connection ,
sqlText : string ,
binds ?: any []
): Promise <any []> {
return new Promise ((resolve, reject ) => {
conn.execute ({
sqlText,
binds,
complete : (err, stmt, rows ) => {
if (err) reject (err);
else resolve (rows || []);
},
});
});
}
export function connectAsync (
conn : snowflake.Connection
): Promise <snowflake.Connection > {
return new Promise ((resolve, reject ) => {
conn.connect ((err, conn ) => {
if (err) reject (err);
else resolve (conn);
});
});
}
Step 4: Unit Tests with Mocked Snowflake
import { describe, it, expect, vi, beforeEach } from 'vitest' ;
vi.mock ('snowflake-sdk' , () => ({
default : {
configure : vi.fn (),
createConnection : vi.fn (() => ({
connect : vi.fn ((cb ) => cb (null , { getId : () => 'mock-id' })),
execute : vi.fn (({ sqlText, complete } ) => {
if (sqlText.includes ('CURRENT_WAREHOUSE' )) {
complete (null , {}, [{ WAREHOUSE : 'DEV_WH_XS' }]);
} else if (sqlText.includes ('SELECT' )) {
complete (null , {}, [
{ ID : 1 , NAME : 'Alice' },
{ ID : 2 , NAME : 'Bob' },
]);
} else {
complete (null , { getNumUpdatedRows : () => 1 }, []);
}
}),
destroy : vi.fn ((cb ) => cb (null )),
})),
},
}));
import { createSnowflakeConnection, executeQuery, connectAsync } from '../../src/snowflake/connection' ;
describe ('Snowflake Queries' , () => {
it ('should connect and execute a query' , async () => {
const conn = createSnowflakeConnection ();
await connectAsync (conn);
const rows = await executeQuery (conn, 'SELECT * FROM USERS' );
expect (rows).toHaveLength (2 );
expect (rows[0 ].NAME ).toBe ('Alice' );
});
});
Step 5: Integration Tests (Against Real Snowflake)
import { describe, it, expect, beforeAll, afterAll } from 'vitest' ;
import { createSnowflakeConnection, connectAsync, executeQuery } from '../../src/snowflake/connection' ;
describe.skipIf (!process.env .SNOWFLAKE_ACCOUNT )('Snowflake Integration' , () => {
let conn : any ;
beforeAll (async () => {
conn = createSnowflakeConnection ();
await connectAsync (conn);
await executeQuery (conn, `
CREATE TEMPORARY TABLE test_users (
id INTEGER AUTOINCREMENT, name VARCHAR(100)
)
` );
});
afterAll (async () => {
conn?.destroy (() => {});
});
it ('should insert and query data' , async () => {
await executeQuery (conn,
'INSERT INTO test_users (name) VALUES (?)' , ['TestUser' ]
);
const rows = await executeQuery (conn, 'SELECT * FROM test_users' );
expect (rows.length ).toBeGreaterThan (0 );
expect (rows[0 ].NAME ).toBe ('TestUser' );
});
});
Step 6: SnowSQL for Quick Iteration
brew install --cask snowflake-snowsql
cat >> ~/.snowsql/config << 'EOF'
[connections.dev]
accountname = myorg-myaccount
username = my_user
dbname = DEV_DB
schemaname = SANDBOX
warehousename = DEV_WH_XS
rolename = DEV_ROLE
EOF
snowsql -c dev -q "SELECT COUNT(*) FROM my_table"
snowsql -c dev -f sql/migrations/V001__create_users.sql
Error Handling Error Cause Solution 000606: No active warehouseDev warehouse suspended Set AUTO_RESUME = TRUE on warehouse Module not found: snowflake-sdkNot installed Run npm install snowflake-sdk Tests timeoutWarehouse resuming from suspend Increase test timeout to 30s, or pre-warm 002003: Object does not existWrong database/schema context Check .env.local DB and SCHEMA values
Resources
Next Steps See snowflake-sdk-patterns for production-ready code patterns.
