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TypeScript Academy · Lesson

End-to-End Type Safety: Schema First Workflow

Maintain a single source of truth from schema to client.

What Is Schema-First?

Schema-first means the GraphQL schema is the single source of truth. Frontend types, backend resolvers, and API contracts all derive from it — preventing any layer from drifting out of sync.

# The workflow:
# 1. Define schema (.graphql or SDL)
# 2. Generate server resolver types
# 3. Generate client operation types
# 4. Both sides automatically stay in sync

Defining the Schema

Write your GraphQL schema in SDL (.graphql files) and commit it to the repo as the contract between client and server.

# schema.graphql
type User {
  id: ID!
  name: String!
  email: String!
}

type Query {
  user(id: ID!): User
}

All lessons in this course

  1. GraphQL Schema to TypeScript Types
  2. Typed Resolvers with GraphQL Code Generator
  3. Typed GraphQL Client with Apollo and urql
  4. End-to-End Type Safety: Schema First Workflow
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