Add diagnostics

Author: Victorystick

index.js

@@ -1,4 +1,4 @@
-var typescript = require( 'typescript' );
+var ts = require( 'typescript' );
 var createFilter = require( 'rollup-pluginutils' ).createFilter;
 
 var assign = Object.assign || function ( target, source ) {
@@ -9,25 +9,57 @@ var assign = Object.assign || function ( target, source ) {
 	return target;
 };
 
-module.exports = function ( options ) {
+function goodErrors ( diagnostic ) {
+	// All errors except `Cannot compile modules into 'es6' when targeting 'ES5' or lower.`
+	return diagnostic.code !== 1204;
+}
+
+module.exports = function typescript ( options ) {
 	options = assign( {}, options || {} );
 
-	var filter = createFilter( options.include, options.exclude );
+	var filter = createFilter( options.include || [ '*.ts+(|x)', '**/*.ts+(|x)' ], options.exclude );
 	delete options.include;
 	delete options.exclude;
 
+	options = assign( {
+		target: ts.ScriptTarget.ES5,
+		module: ts.ModuleKind.ES6,
+		sourceMap: true
+	}, options );
+
 	return {
 		transform: function ( code, id ) {
 			if ( !filter( id ) ) return null;
 
-			var transformed = typescript.transpileModule( code, {
-				compilerOptions: assign( {
-					target: typescript.ScriptTarget.ES5,
-					module: typescript.ModuleKind.ES6,
-					sourceMap: true
-				}, options )
+			var transformed = ts.transpileModule( code, {
+				reportDiagnostics: true,
+				compilerOptions: options
+			});
+
+			var diagnostics = transformed.diagnostics.filter( goodErrors );
+			var fatalError = false;
+
+			diagnostics.forEach(function ( diagnostic ) {
+				var message = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
+
+				if ( diagnostic.file ) {
+					var pos = diagnostic.file.getLineAndCharacterOfPosition( diagnostic.start );
+
+					console.error( diagnostic.file.fileName +
+						'(' + (pos.line + 1) + ',' + (pos.character + 1) + '): error ES' +
+						diagnostic.code + ': ' + message );
+				} else {
+					console.error( 'Error: ' + message );
+				}
+
+				if ( diagnostic.category === ts.DiagnosticCategory.Error ) {
+					fatalError = true;
+				}
 			});
 
+			if ( fatalError ) {
+				throw new Error( 'There were TypeScript errors transpiling "' + id + '"' );
+			}
 
 			return {
 				code: transformed.outputText,