feat: An ability to create context in Sparky (#962)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "fuse-box",
-  "version": "3.0.0-next.26",
+  "version": "3.0.0-next.27",
   "description": "Fuse-Box a bundler that does it right",
   "typings": "index.d.ts",
   "main": "index.js",

src/Utils.ts

@@ -189,6 +189,17 @@ export function hashString(text: string) {
     let data = hash >>> 0;
     return data.toString(16);
 }
+export function isClass(obj) {
+    const isCtorClass = obj.constructor
+        && obj.constructor.toString().substring(0, 5) === 'class'
+    if (obj.prototype === undefined) {
+        return isCtorClass
+    }
+    const isPrototypeCtorClass = obj.prototype.constructor
+        && obj.prototype.constructor.toString
+        && obj.prototype.constructor.toString().substring(0, 5) === 'class'
+    return isCtorClass || isPrototypeCtorClass
+}
 
 export function fastHash(text: string) {
     let hash = 0;

src/index.ts

@@ -43,6 +43,7 @@ export { OptimizeJSPlugin } from "./plugins/OptimizeJSPlugin";
 export { Fluent } from "./arithmetic/Fluent";
 export { FuseBox } from "./core/FuseBox";
 export { Sparky } from "./sparky/Sparky";
+export { SparkyContext } from './sparky/SparkyContext';
 export { CLI } from "./cli/Cli";
 export { CSSModules } from "./plugins/stylesheet/CSSModules";
 export { CopyPlugin } from "./plugins/CopyPlugin";

src/sparky/Sparky.ts

@@ -4,6 +4,7 @@ import { SparkyFilePatternOptions } from "./SparkyFilePattern";
 import { each } from "realm-utils";
 import { WorkFlowContext } from "../core/WorkflowContext";
 import { Log } from "../Log";
+import { SparkyContext, SparkyContextClass, SparkyCurrentContext } from './SparkyContext';
 
 const context = new WorkFlowContext();
 context.doLog = process.env.SPARKY_LOG !== 'false';
@@ -39,6 +40,13 @@ export class Sparky {
         return this;
     }
 
+    public static context(target:
+        () => { [key: string]: any } |
+            (new () => any) |
+            { [key: string]: any }): SparkyContextClass {
+        return SparkyContext(target);
+    }
+
     public static src(glob: string | string[], opts?: SparkyFilePatternOptions): SparkFlow {
         const flow = new SparkFlow();
         let globs = Array.isArray(glob) ? glob : [glob]
@@ -66,7 +74,7 @@ export class Sparky {
             // resolve waterfal dependencies
             each(task.waterfallDependencies, name => this.resolve(name))
         ]).then(() => {
-            return this.execute(task.fn());
+            return this.execute(task.fn(SparkyCurrentContext));
         });
     }
 

src/sparky/SparkyContext.ts

@@ -0,0 +1,23 @@
+import { utils } from "realm-utils";
+import { isClass } from '../Utils';
+export let SparkyCurrentContext;
+
+export class SparkyContextClass {
+    constructor(public target: any) {}
+}
+export function SparkyContext(
+    target:
+        () => { [key: string]: any } |
+            (new () => any) |
+            { [key: string]: any }
+) {
+    if (utils.isPlainObject(target)) {
+        SparkyCurrentContext = target;
+    } else if (isClass(target)) {
+        const Class: any = target;
+        SparkyCurrentContext = new Class();
+    } else if (utils.isFunction(target)) {
+        SparkyCurrentContext = target();
+    }
+    return new SparkyContextClass(SparkyCurrentContext);
+}

src/sparky/index.ts

@@ -0,0 +1,7 @@
+import { Sparky } from './Sparky';
+import { SparkyContext } from './SparkyContext';
+
+export const src = Sparky.src;
+export const watch = Sparky.watch;
+export const task = Sparky.task;
+export const context = SparkyContext;