Don't crash on no args

RyanCavanaugh · RyanCavanaugh · commit 449d60cdffdf · 2018-06-05T14:14:16.000-07:00
diff --git a/src/compiler/tsc.ts b/src/compiler/tsc.ts
@@ -49,7 +49,7 @@ namespace ts {
     }
 
     export function executeCommandLine(args: string[]): void {
-        if ((args[0].toLowerCase() === "--build") || (args[0].toLowerCase() === "-b")) {
+        if (args.length > 0 && ((args[0].toLowerCase() === "--build") || (args[0].toLowerCase() === "-b"))) {
             return performBuild(createCompilerHost({}), createDiagnosticReporter(sys), args.slice(1), sys);
         }
 

Original file line number	Diff line number	Diff line change
`@@ -49,7 +49,7 @@ namespace ts {`
`49`	`49`	`}`
`50`	`50`
`51`	`51`	`export function executeCommandLine(args: string[]): void {`
`52`		`- if ((args[0].toLowerCase() === "--build") \|\| (args[0].toLowerCase() === "-b")) {`
	`52`	`+ if (args.length > 0 && ((args[0].toLowerCase() === "--build") \|\| (args[0].toLowerCase() === "-b"))) {`
`53`	`53`	`return performBuild(createCompilerHost({}), createDiagnosticReporter(sys), args.slice(1), sys);`
`54`	`54`	`}`
`55`	`55`