export LanguageName type and predicates

packages/quicktype-core/src/index.ts

@@ -21,7 +21,7 @@ export { Ref, JSONSchemaType, JSONSchemaAttributes } from "./input/JSONSchemaInp
 export { RenderContext } from "./Renderer";
 export { Option, OptionDefinition, getOptionValues, OptionValues } from "./RendererOptions";
 export { TargetLanguage, MultiFileRenderResult } from "./TargetLanguage";
-export { all as defaultTargetLanguages, languageNamed } from "./language/All";
+export { all as defaultTargetLanguages, languageNamed, isLanguageName } from "./language/All";
 export {
     MultiWord,
     Sourcelike,
@@ -81,6 +81,7 @@ export { StringTypes } from "./attributes/StringTypes";
 export { removeNullFromUnion, matchType, nullableFromUnion } from "./TypeUtils";
 export { ConvenienceRenderer } from "./ConvenienceRenderer";
 export { uriTypeAttributeKind } from "./attributes/URIAttributes";
+export { type LanguageName, type LanguageDisplayName } from "./types";
 
 export { CJSONTargetLanguage, CJSONRenderer, cJSONOptions } from "./language/CJSON";
 export { CPlusPlusTargetLanguage, CPlusPlusRenderer, cPlusPlusOptions } from "./language/CPlusPlus";

packages/quicktype-core/src/language/All.ts

@@ -27,7 +27,7 @@ import { PhpTargetLanguage } from "./Php";
 import { TypeScriptEffectSchemaTargetLanguage } from "./TypeScriptEffectSchema";
 import { ElixirTargetLanguage } from "./Elixir";
 
-import type { LanguageName, LanguageNameMap } from "../types";
+import type { LanguageDisplayName, LanguageName, LanguageNameMap } from "../types";
 
 export const all = [
     new CJSONTargetLanguage(),
@@ -72,3 +72,16 @@ export function languageNamed<Name extends LanguageName>(
 
     return foundLanguage as LanguageNameMap[Name];
 }
+
+export function isLanguageName(maybeName: string): maybeName is LanguageName {
+    if (all.some(lang => (lang.names as readonly string[]).includes(maybeName))) {
+        return true;
+    }
+    return false;
+}
+export function isLanguageDisplayName(maybeName: string): maybeName is LanguageDisplayName {
+    if (all.some(lang => lang.displayName === maybeName)) {
+        return true;
+    }
+    return false;
+}