feat: avoid symbol refs

README.md

@@ -30,6 +30,7 @@ Usage: typescript-json-schema <path-to-typescript-files-or-tsconfig> <type>
 
 Options:
   --refs                Create shared ref definitions.                               [boolean] [default: true]
+  --avoidSymbolRefs     Avoids making refs to type names with symbols.               [boolean] [default: false]
   --aliasRefs           Create shared ref definitions for the type aliases.          [boolean] [default: false]
   --topRef              Create a top-level ref definition.                           [boolean] [default: false]
   --titles              Creates titles in the output schema.                         [boolean] [default: false]

api.md

@@ -891,6 +891,17 @@ export interface MyObject {
 ```
 
 
+## [generic-objects](./test/programs/generic-objects)
+
+```ts
+type MyObject<Key extends string, Value> = {
+    [K in Key]: Value
+}
+
+export type TheObject = MyObject<'foo'|'bar', 'baz'|'bar'>
+```
+
+
 ## [generic-recursive](./test/programs/generic-recursive)
 
 ```ts

test/programs/generic-object-index/main.ts

@@ -0,0 +1,3 @@
+import type { Simplify, Foo } from './types'
+
+export type MyObject = Simplify<Foo>

test/programs/generic-object-index/schema.json

@@ -0,0 +1,17 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "definitions": {
+        "MyObject": {
+            "type": "object",
+            "properties": {
+                "a": {
+                    "type": "number",
+                    "const": 1
+                }
+            },
+            "required": [
+                "a"
+            ]
+        }
+    }
+}

test/programs/generic-object-index/types.ts

@@ -0,0 +1,4 @@
+export type Simplify<T extends object> = {
+    [K in keyof T]: T[K]
+} & {}
+export type Foo = { a: 1 }

test/schema.test.ts

@@ -300,6 +300,10 @@ describe("schema", () => {
     describe("generics", () => {
         assertSchema("generic-simple", "MyObject");
         assertSchema("generic-arrays", "MyObject");
+        assertSchema("generic-object-index", "*", {
+            topRef: true,
+            avoidSymbolRefs: true,
+        });
         assertSchema("generic-multiple", "MyObject");
         assertSchema("generic-multiargs", "MyObject");
         assertSchema("generic-anonymous", "MyObject");

typescript-json-schema-cli.ts

@@ -8,6 +8,8 @@ export function run() {
     var args = require("yargs")
         .usage(helpText)
         .demand(2)
+        .boolean("avoidSymbolRefs").default("avoidSymbolRefs", defaultArgs.avoidSymbolRefs)
+            .describe("avoidSymbolRefs", "Avoids making refs to type names with symbols.")
         .boolean("refs").default("refs", defaultArgs.ref)
             .describe("refs", "Create shared ref definitions.")
         .boolean("aliasRefs").default("aliasRefs", defaultArgs.aliasRef)
@@ -56,6 +58,7 @@ export function run() {
         .argv;
 
     exec(args._[0], args._[1], {
+        avoidSymbolRefs: args.avoidSymbolRefs,
         ref: args.refs,
         aliasRef: args.aliasRefs,
         topRef: args.topRef,

typescript-json-schema.ts

@@ -37,6 +37,7 @@ const NUMERIC_INDEX_PATTERN = "^[0-9]+$";
 
 export function getDefaultArgs(): Args {
     return {
+        avoidSymbolRefs: false,
         ref: true,
         aliasRef: false,
         topRef: false,
@@ -67,6 +68,7 @@ export type ValidationKeywords = {
 };
 
 export type Args = {
+    avoidSymbolRefs: boolean;
     ref: boolean;
     aliasRef: boolean;
     topRef: boolean;
@@ -1320,8 +1322,10 @@ export class JsonSchemaGenerator {
             }
         }
 
+        const avoidRef = this.args.avoidSymbolRefs && /[^\d\w_]/.test(fullTypeName);
+        asRef = asRef && !avoidRef;
         // Handle recursive types
-        if (!isRawType || !!typ.aliasSymbol) {
+        if (!avoidRef && (!isRawType || !!typ.aliasSymbol)) {
             if (this.recursiveTypeRef.has(fullTypeName) && !forceNotRef) {
                 asRef = true;
             } else {