Import with props (#95)

* initial commit. all tests pass

* bump version

package.json

@@ -1,6 +1,6 @@
 {
   "name": "stated-js",
-  "version": "0.1.47",
+  "version": "0.1.48",
   "license": "Apache-2.0",
   "description": "JSONata embedded in JSON",
   "main": "./dist/src/index.js",

src/TemplateProcessor.ts

@@ -679,9 +679,9 @@ export default class TemplateProcessor {
 
     public static NOOP = Symbol('NOOP');
 
-    private getImport = (metaInfo: MetaInfo):(templateToImport:string)=>Promise<symbol> => { //we provide the JSON Pointer that targets where the imported content will go
-        //import the template to the location pointed to by jsonPtr
-        return async (importMe) => {
+    private getImport = (metaInfo: MetaInfo):(templateToImport:string, mergeMe?:object)=>Promise<symbol> => { //we provide the JSON Pointer that targets where the imported content will go
+        //import the template to the location pointed to by jsonPtr. `mergeMe` is like props merges into the imported object before the object is loaded into the template
+        return async (importMe:any, mergeMe?:object) => {
             let resp;
             const parsedUrl = this.parseURL(importMe);
             if (parsedUrl) { //remote download
@@ -714,7 +714,8 @@ export default class TemplateProcessor {
             if (resp === undefined) {
                 throw new Error(`Import failed for '${importMe}' at '${metaInfo.jsonPointer__}'`);
             }
-            await this.setContentInTemplate(resp, metaInfo);
+            const template = mergeMe?{...resp, ...mergeMe}:resp;
+            await this.setContentInTemplate(template, metaInfo);
             return TemplateProcessor.NOOP;
         }
     }

src/test/TemplateProcessor.test.js

@@ -5678,6 +5678,22 @@ test("test fibonacci", async () => {
     }
 });
 
+test("test import with props", async () => {
+    const tp = new TemplateProcessor({
+        a:42,
+        b: "${$import({'c':'doink','d':'boink', 'e':42},{'e':-1, 'f':'nice props'})}"
+    });
+    try {
+        await tp.initialize();
+        expect(tp.output).toEqual({
+            a:42,
+            b: {'c':'doink','d':'boink', 'e':-1, 'f':'nice props'}
+        });
+    } finally {
+        await tp.close();
+    }
+});
+