[initial-value-templates] Allow templates to specify parameters schema

packages/@sanity/initial-value-templates/src/Template.ts

@@ -1,10 +1,13 @@
+import {TemplateParameter} from './TemplateParameters'
+
 export interface Template {
   id: string
   title: string
   description?: string
   schemaType: string
   icon?: Function
   value: {[key: string]: any}
+  parameters?: TemplateParameter[]
 }
 
 export class TemplateBuilder {
@@ -63,7 +66,7 @@ export class TemplateBuilder {
   }
 
   serialize(): Template {
-    const {id, title, description, schemaType, value, icon} = this.spec
+    const {id, title, description, schemaType, value, icon, parameters} = this.spec
     if (!id) {
       throw new Error('Template is missing required "id"')
     }
@@ -80,7 +83,7 @@ export class TemplateBuilder {
       throw new Error(`Template with ID "${id}" is missing required "value"`)
     }
 
-    return {id, title, description, schemaType, value, icon}
+    return {id, title, description, schemaType, value, icon, parameters}
   }
 
   clone(withSpec?: Partial<Template>) {

packages/@sanity/initial-value-templates/src/TemplateParameters.ts

@@ -0,0 +1,25 @@
+export type TemplateParameter = FieldDefinition | ArrayFieldDefinition
+
+export interface TypeTarget {
+  type: string
+}
+
+export interface ReferenceTarget {
+  type: 'reference'
+  to: TypeTarget | TypeTarget[]
+}
+
+export interface FieldDefinition {
+  name: string
+  type: string
+  title?: string
+  description?: string
+  options?: {[key: string]: any}
+}
+
+export type ReferenceFieldDefinition = FieldDefinition & ReferenceTarget
+
+export type ArrayFieldDefinition = FieldDefinition & {
+  type: 'array'
+  of: (ReferenceTarget | TypeTarget)[]
+}