bring in functionality needed from two contributors

README.md

@@ -141,7 +141,8 @@ See [server demo](example) and [browser demo](https://github.com/bcherny/json-sc
 | inferStringEnumKeysFromValues | boolean | `false` | Create enums from JSON enums with eponymous keys |
 | format | boolean | `true` | Format code? Set this to `false` to improve performance. |
 | ignoreMinAndMaxItems | boolean | `false` | Ignore maxItems and minItems for `array` types, preventing tuples being generated. |
-| maxItems | number | `20` | Maximum number of unioned tuples to emit when representing bounded-size array types, before falling back to emitting unbounded arrays. Increase this to improve precision of emitted types, decrease it to improve performance, or set it to `-1` to ignore `maxItems`.
+| maxItems | number | `20` | Maximum number of unioned tuples to emit when representing bounded-size array types, before falling back to emitting unbounded arrays. Increase this to improve precision of emitted types, decrease it to improve performance, or set it to `-1` to ignore `maxItems`. |
+| removeOptionalIfDefaultExists | boolean | `false` | Remove the optional modifier when a property has a default value. |
 | strictIndexSignatures | boolean | `false` | Append all index signatures with `\| undefined` so that they are strictly typed. |
 | style | object | `{ bracketSpacing: false,  printWidth: 120,  semi: true,  singleQuote: false,  tabWidth: 2,  trailingComma: 'none',  useTabs: false }` | A [Prettier](https://prettier.io/docs/en/options.html) configuration |
 | unknownAny | boolean | `true` | Use `unknown` instead of `any` where possible |

package.json

@@ -22,6 +22,7 @@
     "test": "npm run pre-test && ava --timeout=300s --verbose",
     "stresstest": "seq 1 10 | xargs -I{} npm test",
     "prepublishOnly": "npm test",
+    "prepare": "npm run build",
     "pre-test": "npm run clean && npm run format-check && npm run build:server",
     "watch": "tsc -w",
     "watch:test": "ava -w"

src/cli.ts

@@ -20,6 +20,7 @@ main(
       'enableConstEnums',
       'format',
       'ignoreMinAndMaxItems',
+      'removeOptionalIfDefaultExists',
       'strictIndexSignatures',
       'unknownAny',
       'unreachableDefinitions',
@@ -190,6 +191,8 @@ Boolean values can be set to false using the 'no-' prefix.
       array types, before falling back to emitting unbounded arrays. Increase
       this to improve precision of emitted types, decrease it to improve
       performance, or set it to -1 to ignore minItems and maxItems.
+  --removeOptionalIfDefaultExists
+      Remove the optional modifier when a property has a default value
   --style.XXX=YYY
       Prettier configuration
   --unknownAny

src/index.ts

@@ -67,6 +67,10 @@ export interface Options {
    * `minItems` and `maxItems`.
    */
   maxItems: number
+  /**
+   * Remove the optional modifier when a property has a default value.
+   */
+  removeOptionalIfDefaultExists: boolean
   /**
    * Append all index signatures with `| undefined` so that they are strictly typed.
    *
@@ -103,6 +107,7 @@ export const DEFAULT_OPTIONS: Options = {
   format: true,
   ignoreMinAndMaxItems: false,
   maxItems: 20,
+  removeOptionalIfDefaultExists: false,
   strictIndexSignatures: false,
   style: {
     bracketSpacing: false,

src/normalizer.ts

@@ -161,6 +161,27 @@ rules.set('Remove maxItems if it is big enough to likely cause OOMs', (schema, _
   }
 })
 
+// NOTE: https://json-schema.org/draft/2020-12#introduction
+//
+// Keywords for Applying Subschemas to Arrays
+// https://json-schema.org/draft/2019-09/draft-handrews-json-schema-02#rfc.section.9.3.1
+// https://json-schema.org/draft/2020-12/json-schema-core#section-10.3.1
+rules.set('Support the `prefixItems` key from draft 2020-12', schema => {
+  if (!isArrayType(schema)) {
+    return
+  }
+
+  if (schema.hasOwnProperty('prefixItems')) {
+    if (schema.hasOwnProperty('items')) {
+      schema.additionalItems = schema.items as any
+      delete schema.items
+    }
+
+    schema.items = schema.prefixItems as any
+    delete schema.prefixItems
+  }
+})
+
 rules.set('Normalize schema.items', (schema, _fileName, options) => {
   if (options.ignoreMinAndMaxItems) {
     return

src/parser.ts

@@ -383,7 +383,7 @@ function parseSchema(
   let asts: TInterfaceParam[] = map(schema.properties, (value, key: string) => ({
     ast: parse(value, options, key, processed, usedNames),
     isPatternProperty: false,
-    isRequired: includes(schema.required || [], key),
+    isRequired: includes(schema.required || [], key) || (options.removeOptionalIfDefaultExists && 'default' in value),
     isUnreachableDefinition: false,
     keyName: key,
   }))
@@ -404,7 +404,10 @@ via the \`patternProperty\` "${key.replace('*/', '*\\/')}".`
         return {
           ast,
           isPatternProperty: !singlePatternProperty,
-          isRequired: singlePatternProperty || includes(schema.required || [], key),
+          isRequired:
+            singlePatternProperty ||
+            includes(schema.required || [], key) ||
+            (options.removeOptionalIfDefaultExists && 'default' in value),
           isUnreachableDefinition: false,
           keyName: singlePatternProperty ? '[k: string]' : key,
         }
@@ -422,7 +425,8 @@ via the \`definition\` "${key}".`
         return {
           ast,
           isPatternProperty: false,
-          isRequired: includes(schema.required || [], key),
+          isRequired:
+            includes(schema.required || [], key) || (options.removeOptionalIfDefaultExists && 'default' in value),
           isUnreachableDefinition: true,
           keyName: key,
         }