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mistral-local-dev-loop Configure Mistral AI local development with hot reload, testing, and mocking.
Use when setting up a development environment, configuring test workflows,
or establishing a fast iteration cycle with Mistral AI.
Trigger with phrases like "mistral dev setup", "mistral local development",
"mistral dev environment", "develop with mistral".
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jeremylongshore/claude-code-plugins-plus-skills
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name mistral-local-dev-loop description Configure Mistral AI local development with hot reload, testing, and mocking.
Use when setting up a development environment, configuring test workflows,
or establishing a fast iteration cycle with Mistral AI.
Trigger with phrases like "mistral dev setup", "mistral local development",
"mistral dev environment", "develop with mistral".
allowed-tools Read, Write, Edit, Bash(npm:*), Bash(pnpm:*), Grep version 1.12.0 license MIT author Jeremy Longshore <jeremy@intentsolutions.io> tags ["saas","mistral","testing","workflow"] compatibility Designed for Claude Code, also compatible with Codex and OpenClaw
Mistral AI Local Dev Loop
Overview
Set up a fast, reproducible local development workflow for Mistral AI integrations: project scaffold, environment config, hot reload with tsx, unit tests with Vitest mocking, and integration tests against the live API.
Prerequisites
Completed mistral-install-auth setup
Node.js 18+ with npm/pnpm
MISTRAL_API_KEY set in environment
Instructions
Step 1: Project Structure
my-mistral-project/
├── src/
│ ├── mistral/
│ │ ├── client.ts # Singleton client
│ │ ├── config.ts # Config with Zod validation
│ │ └── types.ts # TypeScript types
│ └── index.ts
├── tests/
│ ├── unit/
│ │ └── mistral.test.ts
│ └── integration/
│ └── mistral.integration.test.ts
├── .env.local # Local secrets (git-ignored)
├── .env.example # Template for team
├── tsconfig.json
├── vitest.config.ts
└── package.json
Step 2: Package Configuration
package.json
{
"type" : "module" ,
"scripts" : {
"dev" : "tsx watch src/index.ts" ,
"build" : "tsc" ,
"test" : "vitest run" ,
"test:watch" : "vitest" ,
"test:integration" : "vitest run tests/integration/" ,
"typecheck" : "tsc --noEmit"
} ,
"dependencies"
:
{
"@mistralai/mistralai"
:
"^1.0.0"
}
,
"devDependencies"
:
{
"@types/node"
:
"^20.0.0"
,
"dotenv"
:
"^16.0.0"
,
"tsx"
:
"^4.0.0"
,
"typescript"
:
"^5.0.0"
,
"vitest"
:
"^1.0.0"
}
}
{
"compilerOptions" : {
"target" : "ES2022" ,
"module" : "NodeNext" ,
"moduleResolution" : "NodeNext" ,
"strict" : true ,
"esModuleInterop" : true ,
"skipLibCheck" : true ,
"outDir" : "dist" ,
"rootDir" : "src"
} ,
"include" : [ "src/**/*" ] ,
"exclude" : [ "node_modules" , "dist" ]
}
Step 3: Environment Setup
cat > .env.example << 'EOF'
MISTRAL_API_KEY=your-api-key-here
MISTRAL_MODEL=mistral-small-latest
LOG_LEVEL=debug
EOF
cp .env.example .env.local
echo '.env.local' >> .gitignore
echo '.env' >> .gitignore
Step 4: Client Module
import { Mistral } from '@mistralai/mistralai' ;
import 'dotenv/config' ;
let instance : Mistral | null = null ;
export function getMistralClient (Mistral {
if (!instance) {
const apiKey = process.env .MISTRAL_API_KEY ;
if (!apiKey) throw new Error ('MISTRAL_API_KEY not set' );
instance = new Mistral ({ apiKey, timeoutMs : 30_000 });
}
return instance;
}
export function resetClient (void {
instance = null ;
}
Step 5: Unit Tests with Mocking import { defineConfig } from 'vitest/config' ;
export default defineConfig ({
test : {
globals : true ,
environment : 'node' ,
include : ['tests/**/*.test.ts' ],
coverage : { provider : 'v8' , reporter : ['text' , 'json' ] },
},
});
tests/unit/mistral.test.ts
import { describe, it, expect, vi, beforeEach } from 'vitest' ;
vi.mock ('@mistralai/mistralai' , () => ({
Mistral : vi.fn ().mockImplementation (() => ({
chat : {
complete : vi.fn ().mockResolvedValue ({
id : 'test-id' ,
model : 'mistral-small-latest' ,
choices : [{
index : 0 ,
message : { role : 'assistant' , content : 'Mocked response' },
finishReason : 'stop' ,
}],
usage : { promptTokens : 10 , completionTokens : 5 , totalTokens : 15 },
}),
stream : vi.fn ().mockImplementation (async function * () {
yield { data : { choices : [{ delta : { content : 'Streamed ' } }] } };
yield { data : { choices : [{ delta : { content : 'response' } }] } };
}),
},
embeddings : {
create : vi.fn ().mockResolvedValue ({
data : [{ embedding : new Array (1024 ).fill (0.1 ) }],
usage : { totalTokens : 5 },
}),
},
models : {
list : vi.fn ().mockResolvedValue ({ data : [{ id : 'mistral-small-latest' }] }),
},
})),
}));
describe ('Mistral Client' , () => {
beforeEach (() => { vi.clearAllMocks (); });
it ('should complete chat' , async () => {
const { Mistral } = await import ('@mistralai/mistralai' );
const client = new Mistral ({ apiKey : 'test' });
const response = await client.chat .complete ({
model : 'mistral-small-latest' ,
messages : [{ role : 'user' , content : 'Test' }],
});
expect (response.choices ?.[0 ]?.message ?.content ).toBe ('Mocked response' );
expect (response.usage ?.totalTokens ).toBe (15 );
});
it ('should generate embeddings' , async () => {
const { Mistral } = await import ('@mistralai/mistralai' );
const client = new Mistral ({ apiKey : 'test' });
const response = await client.embeddings .create ({
model : 'mistral-embed' ,
inputs : ['test text' ],
});
expect (response.data [0 ].embedding ).toHaveLength (1024 );
});
});
Step 6: Integration Test (Live API)
import { describe, it, expect } from 'vitest' ;
import { Mistral } from '@mistralai/mistralai' ;
const apiKey = process.env .MISTRAL_API_KEY ;
describe.skipIf (!apiKey)('Mistral Integration' , () => {
const client = new Mistral ({ apiKey : apiKey! });
it ('should list models' , async () => {
const models = await client.models .list ();
expect (models.data ?.length ).toBeGreaterThan (0 );
}, 10_000 );
it ('should complete chat' , async () => {
const response = await client.chat .complete ({
model : 'mistral-small-latest' ,
messages : [{ role : 'user' , content : 'Reply with "ok"' }],
maxTokens : 10 ,
temperature : 0 ,
});
expect (response.choices ?.[0 ]?.message ?.content ).toBeTruthy ();
}, 15_000 );
it ('should generate embeddings' , async () => {
const response = await client.embeddings .create ({
model : 'mistral-embed' ,
inputs : ['test' ],
});
expect (response.data [0 ].embedding ).toHaveLength (1024 );
}, 10_000 );
});
Output
Working dev environment with hot reload (tsx watch)
Unit tests with full SDK mocking
Integration tests against live API (skip when no key)
Environment variable management with .env.local
Error Handling Error Cause Solution Module not found Missing dependency Run npm install Env not loaded Missing .env.local Copy from .env.example Integration timeout Slow API response Increase test timeout Mock type errors SDK interface changed Update mock to match current SDK
Resources
Next Steps See mistral-sdk-patterns for production-ready code patterns.
