Add support for comments in tsconfig.json, fix ivogabe#210

Author: ivogabe

lib/main.ts

@@ -271,7 +271,12 @@ module compile {
 				tsConfigFileName = fileNameOrSettings;
 				// load file and strip BOM, since JSON.parse fails to parse if there's a BOM present
 				let tsConfigText = fs.readFileSync(fileNameOrSettings).toString();
-				tsConfigContent = JSON.parse(tsConfigText.replace(/^\uFEFF/, ''));
+				const typescript = (settings && settings.typescript) || ts;
+				const tsConfig = tsApi.parseTsConfig(typescript, tsConfigFileName, tsConfigText);
+				tsConfigContent = tsConfig.config || {};
+				if (tsConfig.error) {
+					console.log(tsConfig.error.messageText);
+				}
 				let newSettings: any = {};
 				if (tsConfigContent.compilerOptions) {
 					for (const key of Object.keys(tsConfigContent.compilerOptions)) {

lib/tsapi.ts

@@ -11,6 +11,23 @@ export interface TypeScript15 {
 	flattenDiagnosticMessageText(messageText: string | DiagnosticMessageChain15, newLine: string): string;
 	transpile(input: string, compilerOptions?: ts.CompilerOptions, fileName?: string, diagnostics?: ts.Diagnostic[]): string;
 }
+export interface TypeScript17 {
+	parseConfigFileTextToJson(fileName: string, jsonText: string): {
+        config?: any;
+        error?: ts.Diagnostic;
+    };
+}
+
+export function parseTsConfig(typescript: TypeScript14 | TypeScript15 | TypeScript17, fileName: string, content: string) {
+	if ('parseConfigFileTextToJson' in typescript) {
+		return (<TypeScript17> typescript).parseConfigFileTextToJson(fileName, content);
+	} else {
+		return {
+			config: JSON.parse(content.replace(/^\uFEFF/, ''))
+		};
+	}
+}
+	
 
 /*
  * In TS1.6+ ts.createProgram has an extra argument, `oldProgram`.