Do not write build info if there are no files to emit

sheetalkamat · sheetalkamat · commit bb4872b06391 · 2019-10-15T08:37:23.000-07:00
diff --git a/src/compiler/builder.ts b/src/compiler/builder.ts
@@ -251,6 +251,9 @@ namespace ts {
             state.seenAffectedFiles = createMap<true>();
         }
 
+        state.emittedBuildInfo = !state.changedFilesSet.size &&
+            !state.affectedFilesPendingEmit;
+
         return state;
     }
 
diff --git a/tests/baselines/reference/tsc/incremental/incremental-declaration-doesnt-change/when-passing-filename-for-buildinfo-on-commandline.js b/tests/baselines/reference/tsc/incremental/incremental-declaration-doesnt-change/when-passing-filename-for-buildinfo-on-commandline.js
@@ -3,4 +3,3 @@
 exitCode:: 0
 
 
-//// [/src/project/.tsbuildinfo] file written with same contents

Original file line number	Diff line number	Diff line change
`@@ -251,6 +251,9 @@ namespace ts {`
`251`	`251`	`state.seenAffectedFiles = createMap<true>();`
`252`	`252`	`}`
`253`	`253`
	`254`	`+ state.emittedBuildInfo = !state.changedFilesSet.size &&`
	`255`	`+ !state.affectedFilesPendingEmit;`
	`256`	`+`
`254`	`257`	`return state;`
`255`	`258`	`}`
`256`	`259`
Original file line number	Diff line number	Diff line change
`@@ -3,4 +3,3 @@`
`3`	`3`	`exitCode:: 0`
`4`	`4`
`5`	`5`
`6`		`-//// [/src/project/.tsbuildinfo] file written with same contents`