refactor(utilities): add a getConstConfig utility

getConstConfig permit to get an exported const string value from a module.ts file

see angular#3452

Author: nlm-pro

packages/angular-cli/blueprints/component/index.js

@@ -7,7 +7,7 @@ const getFiles = Blueprint.prototype.files;
 const stringUtils = require('ember-cli-string-utils');
 const astUtils = require('../../utilities/ast-utils');
 const NodeHost = require('@angular-cli/ast-tools').NodeHost;
-const ts = require('typescript');
+const getConstConfig = require('../../utilities/get-const-config').default;
 
 module.exports = {
   description: '',
@@ -38,20 +38,8 @@ module.exports = {
 
     this.dynamicPath = parsedPath;
 
-    var modulePrefix = '';
+    var modulePrefix = getConstConfig(this.project, this.dynamicPath.dir, 'ModulePrefix');
 
-    // TODO : make it generic and move it to utilities
-    try {
-      let pathToModule = findParentModule(this.project, this.dynamicPath.dir);
-      astUtils.getSourceNodes(astUtils.getSource(pathToModule))
-        .last(node => (node.flags & ts.NodeFlags.Export) !== 0 && node.getText().indexOf('ModulePrefix') > -1)
-        .subscribe(node => {
-          modulePrefix = /= ?['"]([\w-]+)["']/.exec(node.getText())[1];
-        });
-    } catch(e) {
-      console.log(`there isn't any module for this component\n\t`);
-    }
-   
     var defaultPrefix = '';
     if (this.project.ngConfig &&
         this.project.ngConfig.apps[0] &&

packages/angular-cli/blueprints/directive/index.js

@@ -6,7 +6,7 @@ const findParentModule = require('../../utilities/find-parent-module').default;
 const NodeHost = require('@angular-cli/ast-tools').NodeHost;
 const Blueprint = require('../../ember-cli/lib/models/blueprint');
 const getFiles = Blueprint.prototype.files;
-const ts = require('typescript');
+const getConstConfig = require('../../utilities/get-const-config').default;
 
 
 module.exports = {
@@ -34,19 +34,7 @@ module.exports = {
 
     this.dynamicPath = parsedPath;
 
-    var modulePrefix = '';
-
-    // TODO : make it generic and move it to utilities
-    try {
-      let pathToModule = findParentModule(this.project, this.dynamicPath.dir);
-      astUtils.getSourceNodes(astUtils.getSource(pathToModule))
-        .last(node => (node.flags & ts.NodeFlags.Export) !== 0 && node.getText().indexOf('ModulePrefix') > -1)
-        .subscribe(node => {
-          modulePrefix = /= ?['"]([\w-]+)["']/.exec(node.getText())[1];
-        });
-    } catch(e) {
-      console.log(`there isn't any module for this directive\n\t`);
-    }
+    var modulePrefix = getConstConfig(this.project, this.dynamicPath.dir, 'ModulePrefix');
 
     var defaultPrefix = '';
     if (this.project.ngConfig &&

packages/angular-cli/utilities/get-const-config.ts

@@ -0,0 +1,24 @@
+import findParentModule from './find-parent-module';
+import * as astUtils from './ast-utils';
+import * as ts from 'typescript';
+
+export default function getConstConfig(project: any, dir: string, identifier: string): string {
+    let modulePrefix = '';
+    try {
+        let pathToModule = findParentModule(project, dir);
+        console.log(pathToModule);
+
+        astUtils.getSourceNodes(astUtils.getSource(pathToModule))
+            .last((node: ts.Node) => {
+                // tslint:disable-next-line:no-bitwise
+                return (node.flags & ts.NodeFlags.Export) !== 0
+                    && node.getText().includes(identifier);
+            })
+            .subscribe((node: ts.Node) => {
+                modulePrefix = /= ?['"]([\w-]+)["']/.exec(node.getText())[1];
+            });
+    } catch (e) {
+        console.log(`no const configuration found for ${identifier} in the parent module\n\t`);
+    }
+    return modulePrefix;
+}