effect-schema

# Effect Schema

Master type-safe data validation and transformation with @effect/schema. This
skill covers schema definition, parsing, encoding, and advanced schema patterns
for building robust data pipelines.

## Basic Schema Types

### Primitive Schemas

```typescript
import { Schema } from "@effect/schema"

// Primitive types
const StringSchema = Schema.String
const NumberSchema = Schema.Number
const BooleanSchema = Schema.Boolean
const BigIntSchema = Schema.BigInt
const SymbolSchema = Schema.Symbol

// Special types
const UndefinedSchema = Schema.Undefined
const VoidSchema = Schema.Void
const NullSchema = Schema.Null
const UnknownSchema = Schema.Unknown
const AnySchema = Schema.Any
```

### Literal Values

```typescript
import { Schema } from "@effect/schema"

// String literal
const HelloSchema = Schema.Literal("hello")

// Number literal
const FortyTwoSchema = Schema.Literal(42)

// Boolean literal
const TrueSchema = Schema.Literal(true)

// Multiple literals (union)
const StatusSchema = Schema.Literal("pending", "approved", "rejected")
```

## Struct Schemas

### Basic Struct

```typescript
import { Schema } from "@effect/schema"

// Define user schema
const UserSchema = Schema.Struct({
  id: Schema.String,
  name: Schema.String,
  age: Schema.Number,
  email: Schema.String
})

// Infer TypeScript type
type User = Schema.Schema.Type<typeof UserSchema>
// { id: string; name: string; age: number; email: string }
```

### Optional Fields

```typescript
import { Schema } from "@effect/schema"

const PersonSchema = Schema.Struct({
  name: Schema.String,
  age: Schema.Number,
  email: Schema.optional(Schema.String),
  phone: Schema.optional(Schema.String)
})

type Person = Schema.Schema.Type<typeof PersonSchema>
// { name: string; age: number; email?: string; phone?: string }
```

### Nested Schemas

```typescript
import { Schema } from "@effect/schema"

const AddressSchema = Schema.Struct({
  street: Schema.String,
  city: Schema.String,
  zipCode: Schema.String