diff --git a/packages/angular_devkit/architect/node/node-modules-architect-host.ts b/packages/angular_devkit/architect/node/node-modules-architect-host.ts
index 9e78000ea783..f723611891de 100644
--- a/packages/angular_devkit/architect/node/node-modules-architect-host.ts
+++ b/packages/angular_devkit/architect/node/node-modules-architect-host.ts
@@ -143,7 +143,11 @@ export class WorkspaceNodeModulesArchitectHost implements ArchitectHost<NodeModu
   }
 
   async loadBuilder(info: NodeModulesBuilderInfo): Promise<Builder> {
-    const builder = (await import(info.import)).default;
+    // f1 const is a temporary workaround for a TS bug with UMDs.
+    // See microsoft/TypeScript#36780. Should be removed when
+    // https://github.com/bazelbuild/rules_typescript/pull/492 goes in.
+    const f1 = info.import;
+    const builder = (await import(f1)).default;
     if (builder[BuilderSymbol]) {
       return builder;
     }
diff --git a/packages/angular_devkit/architect/testing/testing-architect-host.ts b/packages/angular_devkit/architect/testing/testing-architect-host.ts
index c7d901f3906b..d5fd05479a37 100644
--- a/packages/angular_devkit/architect/testing/testing-architect-host.ts
+++ b/packages/angular_devkit/architect/testing/testing-architect-host.ts
@@ -36,7 +36,11 @@ export class TestingArchitectHost implements ArchitectHost {
     this._builderMap.set(builderName, { builderName, description, optionSchema });
   }
   async addBuilderFromPackage(packageName: string) {
-    const packageJson = await import(packageName + '/package.json');
+    // f1 const is a temporary workaround for a TS bug with UMDs.
+    // See microsoft/TypeScript#36780. Should be removed when
+    // https://github.com/bazelbuild/rules_typescript/pull/492 goes in.
+    const f1 = packageName + '/package.json';
+    const packageJson = await import(f1);
     if (!('builders' in packageJson)) {
       throw new Error('Invalid package.json, builders key not found.');
     }
@@ -56,8 +60,13 @@ export class TestingArchitectHost implements ArchitectHost {
       const b = builders[builderName];
       // TODO: remove this check as v1 is not supported anymore.
       if (!b.implementation) { continue; }
-      const handler = (await import(builderJsonPath + '/../' + b.implementation)).default;
-      const optionsSchema = await import(builderJsonPath + '/../' + b.schema);
+      // f2 and f3 consts are a temporary workaround for a TS bug with UMDs.
+      // See microsoft/TypeScript#36780. Should be removed when
+      // https://github.com/bazelbuild/rules_typescript/pull/492 goes in.
+      const f2 = builderJsonPath + '/../' + b.implementation;
+      const handler = (await import(f2)).default;
+      const f3 = builderJsonPath + '/../' + b.schema;
+      const optionsSchema = await import(f3);
       this.addBuilder(`${packageJson.name}:${builderName}`, handler, b.description, optionsSchema);
     }
   }