Increase type safety.

Author: ryukzak

src/api/builder.ts

@@ -369,10 +369,10 @@ export class APIBuilder {
                 complexType: [],
             },
         };
-        const opts = {
+        const opts: MustacheGeneratorOptions = {
             ...defaultMustacheOpts,
             ...Object.fromEntries(Object.entries(userOpts).filter(([_, v]) => v !== undefined)),
-        } as MustacheGeneratorOptions;
+        };
         const generator = writerToGenerator(Mustache.createGenerator(opts));
         this.generators.set(`mustache[${opts.templatePath}]`, generator);
         this.logger.debug(`Configured TypeScript generator (${JSON.stringify(opts, undefined, 2)})`);