refactor(@angular-devkit/architect): remove builder option generic json constraint

The `json.JsonObject` generic constraint did not force the options type to be a valid JSON object but required all builders to add the `json.JsonObject` type to all builder option types when calling `createBuilder`.

Author: clydin

etc/api/angular_devkit/architect/src/index.d.ts

@@ -26,7 +26,7 @@ export interface BuilderContext {
     validateOptions<T extends json.JsonObject = json.JsonObject>(options: json.JsonObject, builderName: string): Promise<T>;
 }
 
-export interface BuilderHandlerFn<A extends json.JsonObject> {
+export interface BuilderHandlerFn<A> {
     (input: A, context: BuilderContext): BuilderOutputLike;
 }
 
@@ -60,7 +60,7 @@ export interface BuilderRun {
     stop(): Promise<void>;
 }
 
-export declare function createBuilder<OptT extends json.JsonObject, OutT extends BuilderOutput = BuilderOutput>(fn: BuilderHandlerFn<OptT>): Builder<OptT>;
+export declare function createBuilder<OptT = json.JsonObject, OutT extends BuilderOutput = BuilderOutput>(fn: BuilderHandlerFn<OptT>): Builder<OptT & json.JsonObject>;
 
 export declare function fromAsyncIterable<T>(iterable: AsyncIterable<T>): Observable<T>;
 

packages/angular_devkit/architect/src/api.ts

@@ -305,7 +305,7 @@ async function handleAsyncIterator<T>(
 /**
  * A builder handler function. The function signature passed to `createBuilder()`.
  */
-export interface BuilderHandlerFn<A extends json.JsonObject> {
+export interface BuilderHandlerFn<A> {
   /**
    * Builders are defined by users to perform any kind of task, like building, testing or linting,
    * and should use this interface.

packages/angular_devkit/architect/src/create-builder.ts

@@ -28,11 +28,11 @@ import { scheduleByName, scheduleByTarget } from './schedule-by-name';
 
 // tslint:disable-next-line: no-big-function
 export function createBuilder<
-  OptT extends json.JsonObject,
+  OptT = json.JsonObject,
   OutT extends BuilderOutput = BuilderOutput,
 >(
   fn: BuilderHandlerFn<OptT>,
-): Builder<OptT> {
+): Builder<OptT & json.JsonObject> {
   const cjh = experimental.jobs.createJobHandler;
   const handler = cjh<json.JsonObject, BuilderInput, OutT>((options, context) => {
     const scheduler = context.scheduler;