refactor(parsing): don't create ts program for each child on a file, 300% boost !

Author: vogloblinsky

src/app/compiler/dependencies.ts

@@ -144,18 +144,23 @@ export class Dependencies {
 
     private getSourceFileDecorators(srcFile: ts.SourceFile, outputSymbols: Object): void {
 
+        let cleaner = (process.cwd() + path.sep).replace(/\\/g, '/');
+        let file = srcFile.fileName.replace(cleaner, '');
+
+        this.programComponent = ts.createProgram([file], {});
+        let sourceFile = this.programComponent.getSourceFile(file);
+        this.typeCheckerComponent = this.programComponent.getTypeChecker(true);
+
         ts.forEachChild(srcFile, (node: ts.Node) => {
 
             let deps: Deps = <Deps>{};
-            let cleaner = (process.cwd() + path.sep).replace(/\\/g, '/');
-            let file = srcFile.fileName.replace(cleaner, '');
             if (node.decorators) {
                 let visitNode = (visitedNode, index) => {
 
                     let metadata = node.decorators.pop();
                     let name = this.getSymboleName(node);
                     let props = this.findProps(visitedNode);
-                    let IO = this.getComponentIO(file);
+                    let IO = this.getComponentIO(file, sourceFile);
 
                     if (this.isModule(metadata)) {
                         deps = {
@@ -252,7 +257,7 @@ export class Dependencies {
             else if (node.symbol) {
                 if(node.symbol.flags === ts.SymbolFlags.Class) {
                     let name = this.getSymboleName(node);
-                    let IO = this.getComponentIO(file);
+                    let IO = this.getComponentIO(file, sourceFile);
                     deps = {
                         name,
                         file: file,
@@ -270,7 +275,7 @@ export class Dependencies {
                     outputSymbols['classes'].push(deps);
                 }
             } else {
-                let IO = this.getRouteIO(file);
+                let IO = this.getRouteIO(file, sourceFile);
                 if(IO.routes) {
                     let newRoutes;
                     try {
@@ -695,14 +700,10 @@ export class Dependencies {
         return [];
     }
 
-    private getRouteIO(filename: string) {
+    private getRouteIO(filename, sourceFile) {
         /**
          * Copyright https://github.com/ng-bootstrap/ng-bootstrap
          */
-        this.programComponent = ts.createProgram([filename], {});
-        let sourceFile = this.programComponent.getSourceFile(filename);
-        this.typeCheckerComponent = this.programComponent.getTypeChecker(true);
-
         var res = sourceFile.statements.reduce((directive, statement) => {
 
             if (statement.kind === ts.SyntaxKind.VariableStatement) {
@@ -715,14 +716,10 @@ export class Dependencies {
         return res[0] || {};
     }
 
-    private getComponentIO(filename: string) {
+    private getComponentIO(filename: string, sourceFile) {
         /**
          * Copyright https://github.com/ng-bootstrap/ng-bootstrap
          */
-        this.programComponent = ts.createProgram([filename], {});
-        let sourceFile = this.programComponent.getSourceFile(filename);
-        this.typeCheckerComponent = this.programComponent.getTypeChecker(true);
-
         var res = sourceFile.statements.reduce((directive, statement) => {
 
             if (statement.kind === ts.SyntaxKind.ClassDeclaration) {