Add toJSON methods to every type

README.md

@@ -16,7 +16,7 @@ npm install standardschema --save
 ## Usage
 
 ```ts
-import { fromJSON, AnyType, IntegerType, StringType, ... } from 'standardschema'
+import { fromJSON } from 'standardschema'
 
 const model = fromJSON({
   '@type': 'Object',
@@ -29,7 +29,7 @@ const model = fromJSON({
   ]
 })
 
-model.isAssignable(new IntegerType()) //=> false
+model.isAssignable(fromJSON({ '@type': 'Integer' })) //=> false
 ```
 
 ## License

src/index.spec.ts

@@ -2,8 +2,6 @@ import {
   AnyType,
   StringType,
   IntegerType,
-  ObjectType,
-  ListType,
   fromJSON,
   FloatType
 } from './index'

src/index.ts

@@ -1,4 +1,4 @@
-import { prop } from 'functools'
+import { prop, invoke } from 'functools'
 import { zip, map } from 'iterative'
 
 export class AnyType {
@@ -10,6 +10,10 @@ export class AnyType {
     return new UnknownType()
   }
 
+  toJSON () {
+    return { '@type': 'Any' }
+  }
+
   static fromJSON(data: any) {
     return new AnyType()
   }
@@ -20,6 +24,10 @@ export class UnknownType extends AnyType {
     return other instanceof UnknownType
   }
 
+  toJSON () {
+    return { '@type': 'Unknown' }
+  }
+
   static fromJSON(data: any) {
     return new UnknownType()
   }
@@ -30,6 +38,10 @@ export class NullType extends AnyType {
     return other instanceof NullType
   }
 
+  toJSON () {
+    return { '@type': 'Null' }
+  }
+
   static fromJSON(data: any) {
     return new NullType()
   }
@@ -40,6 +52,10 @@ export class BooleanType extends AnyType {
     return other instanceof BooleanType
   }
 
+  toJSON () {
+    return { '@type': 'Boolean' }
+  }
+
   static fromJSON(data: any) {
     return new BooleanType()
   }
@@ -50,6 +66,10 @@ export class StringType extends AnyType {
     return other instanceof StringType
   }
 
+  toJSON () {
+    return { '@type': 'String' }
+  }
+
   static fromJSON(data: any) {
     return new StringType()
   }
@@ -60,6 +80,10 @@ export class NumberType extends AnyType {
     return other instanceof NumberType
   }
 
+  toJSON () {
+    return { '@type': 'Number' }
+  }
+
   static fromJSON(data: any) {
     return new NumberType()
   }
@@ -70,6 +94,10 @@ export class IntegerType extends NumberType {
     return other instanceof IntegerType
   }
 
+  toJSON () {
+    return { '@type': 'Integer' }
+  }
+
   static fromJSON(data: any) {
     return new IntegerType()
   }
@@ -80,6 +108,10 @@ export class FloatType extends NumberType {
     return other instanceof FloatType
   }
 
+  toJSON () {
+    return { '@type': 'Float' }
+  }
+
   static fromJSON(data: any) {
     return new FloatType()
   }
@@ -100,6 +132,10 @@ export class ListType<T extends AnyType> extends AnyType {
     return this.items // TODO: Enable out-of-bounds indexes with min/max items.
   }
 
+  toJSON () {
+    return { '@type': 'List', items: this.items.toJSON() }
+  }
+
   static fromJSON(data: any) {
     return new ListType(fromJSON(data.items))
   }
@@ -117,6 +153,15 @@ export class PropertyType<V extends AnyType> extends UnknownType {
     return this.value.isAssignable(other.value)
   }
 
+  toJSON () {
+    return {
+      '@type': 'Property',
+      key: this.key,
+      value: this.value.toJSON(),
+      required: this.required
+    }
+  }
+
   static fromJSON(data: any) {
     return new PropertyType(
       String(data.key),
@@ -161,6 +206,13 @@ export class ObjectType extends AnyType {
     return super.getProperty(key)
   }
 
+  toJSON() {
+    return {
+      '@type': 'Object',
+      properties: Array.from(map(this.properties.values(), invoke('toJSON')))
+    }
+  }
+
   static fromJSON(data: any) {
     return new ObjectType(data.properties.map(fromJSON))
   }
@@ -171,6 +223,10 @@ export class DateType extends AnyType {
     return other instanceof DateType
   }
 
+  toJSON() {
+    return { '@type': 'Date' }
+  }
+
   static fromJSON(data: any) {
     return new DateType()
   }
@@ -181,6 +237,10 @@ export class DateTimeType extends DateType {
     return other instanceof DateTimeType
   }
 
+  toJSON() {
+    return { '@type': 'DateTime' }
+  }
+
   static fromJSON(data: any) {
     return new DateTimeType()
   }