Handle emptymatched files list (fixes #1863) (#1933)

src/runner.ts

@@ -190,7 +190,7 @@ export class Runner {
             // remove single quotes which break matching on Windows when glob is passed in single quotes
             .map(Runner.trimSingleQuotes)
             .map((file: string) => glob.sync(file, { ignore: ignorePatterns, nodir: true }))
-            .reduce((a: string[], b: string[]) => a.concat(b));
+            .reduce((a: string[], b: string[]) => a.concat(b), []);
 
         try {
             this.processFiles(onComplete, files, program);

test/executable/executableTests.ts

@@ -80,7 +80,8 @@ describe("Executable", function (this: Mocha.ISuiteCallbackContext) {
             execCli(["-c", "test/config/tslint-extends-package-no-mod.json", "src/test.ts"], (err) => {
                 assert.isNull(err, "process should exit without an error");
                 done();
-            });        });
+            });
+        });
 
         it("exits with code 1 if config file is invalid", (done) => {
             execCli(["-c", "test/config/tslint-invalid.json", "src/test.ts"], (err, stdout, stderr) => {
@@ -211,6 +212,14 @@ describe("Executable", function (this: Mocha.ISuiteCallbackContext) {
                     done();
                 });
         });
+
+        it("exits with code 0 if `tsconfig.json` is passed but it includes no ts files", (done) => {
+            execCli(["-c", "test/files/tsconfig-no-ts-files/tslint.json", "--project", "test/files/tsconfig-no-ts-files/tsconfig.json"],
+                (err) => {
+                    assert.isNull(err, "process should exit without an error");
+                    done();
+                });
+        });
     });
 
     describe("--init flag", () => {

test/files/tsconfig-no-ts-files/tsconfig.json

@@ -0,0 +1,5 @@
+{
+    "include": [
+        "*"
+    ]
+}

test/files/tsconfig-no-ts-files/tslint.json

@@ -0,0 +1,5 @@
+{
+    "extends": [
+        "tslint:latest"
+    ]
+}