feat(server-core): add fastReloadEnabled option to CompilerApi

Author: Mikhail Astashkevich

packages/cubejs-backend-shared/src/env.ts

@@ -1963,6 +1963,9 @@ const variables: Record<string, (...args: any) => any> = {
 
     return undefined;
   },
+  fastReloadEnabled: () => get('CUBEJS_FAST_RELOAD_ENABLED')
+    .default('false')
+    .asBoolStrict(),
 };
 
 type Vars = typeof variables;

packages/cubejs-server-core/src/core/CompilerApi.js

@@ -53,7 +53,7 @@ export class CompilerApi {
       compilerVersion = JSON.stringify(compilerVersion);
     }
 
-    if (this.options.devServer) {
+    if (this.options.devServer || this.options.fastReloadEnabled) {
       const files = await this.repository.dataSchemaFiles();
       compilerVersion += `_${crypto.createHash('md5').update(JSON.stringify(files)).digest('hex')}`;
     }

packages/cubejs-server-core/src/core/server.ts

@@ -712,6 +712,7 @@ export class CubejsServerCore {
         sqlCache: this.options.sqlCache,
         standalone: this.standalone,
         allowNodeRequire: options.allowNodeRequire,
+        fastReloadEnabled: getEnv('fastReloadEnabled'),
       },
     );
   }