Merge pull request #5643 from Microsoft/lambdaSourceMap

Fix sourcemap emit for the labda expression that is on another line

Author: sheetalkamat

src/compiler/emitter.ts

@@ -5003,8 +5003,10 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                     increaseIndent();
                     writeLine();
                     emitLeadingComments(node.body);
+                    emitStart(body);
                     write("return ");
                     emit(body);
+                    emitEnd(body);
                     write(";");
                     emitTrailingComments(node.body);
 

tests/baselines/reference/sourceMapValidationLambdaSpanningMultipleLines.js

@@ -0,0 +1,54 @@
+===================================================================
+JsFile: sourceMapValidationLambdaSpanningMultipleLines.js
+mapUrl: sourceMapValidationLambdaSpanningMultipleLines.js.map
+sourceRoot: 
+sources: sourceMapValidationLambdaSpanningMultipleLines.ts
+===================================================================
+-------------------------------------------------------------------
+emittedFile:tests/cases/compiler/sourceMapValidationLambdaSpanningMultipleLines.js
+sourceFile:sourceMapValidationLambdaSpanningMultipleLines.ts
+-------------------------------------------------------------------
+>>>(function (item) {
+1 >
+2 >^
+3 > ^^^^^^^^^^
+4 >           ^^^^
+5 >               ^^->
+1 >
+2 >(
+3 > (
+4 >           item: string
+1 >Emitted(1, 1) Source(1, 1) + SourceIndex(0)
+2 >Emitted(1, 2) Source(1, 2) + SourceIndex(0)
+3 >Emitted(1, 12) Source(1, 3) + SourceIndex(0)
+4 >Emitted(1, 16) Source(1, 15) + SourceIndex(0)
+---
+>>>    return item;
+1->^^^^
+2 >    ^^^^^^^
+3 >           ^^^^
+1->) =>
+  >    
+2 >    
+3 >           item
+1->Emitted(2, 5) Source(2, 5) + SourceIndex(0)
+2 >Emitted(2, 12) Source(2, 5) + SourceIndex(0)
+3 >Emitted(2, 16) Source(2, 9) + SourceIndex(0)
+---
+>>>});
+1 >
+2 >^
+3 > ^
+4 >  ^
+5 >   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1 >
+2 >item
+3 > 
+  > )
+4 >  
+1 >Emitted(3, 1) Source(2, 5) + SourceIndex(0)
+2 >Emitted(3, 2) Source(2, 9) + SourceIndex(0)
+3 >Emitted(3, 3) Source(3, 2) + SourceIndex(0)
+4 >Emitted(3, 4) Source(3, 2) + SourceIndex(0)
+---
+>>>//# sourceMappingURL=sourceMapValidationLambdaSpanningMultipleLines.js.map

tests/baselines/reference/sourceMapValidationLambdaSpanningMultipleLines.js.map

@@ -0,0 +1,8 @@
+=== tests/cases/compiler/sourceMapValidationLambdaSpanningMultipleLines.ts ===
+((item: string) =>
+>item : Symbol(item, Decl(sourceMapValidationLambdaSpanningMultipleLines.ts, 0, 2))
+
+    item
+>item : Symbol(item, Decl(sourceMapValidationLambdaSpanningMultipleLines.ts, 0, 2))
+
+)

tests/baselines/reference/sourceMapValidationLambdaSpanningMultipleLines.sourcemap.txt

@@ -0,0 +1,10 @@
+=== tests/cases/compiler/sourceMapValidationLambdaSpanningMultipleLines.ts ===
+((item: string) =>
+>((item: string) =>    item) : (item: string) => string
+>(item: string) =>    item : (item: string) => string
+>item : string
+
+    item
+>item : string
+
+)

tests/baselines/reference/sourceMapValidationLambdaSpanningMultipleLines.symbols

@@ -0,0 +1,4 @@
+// @sourcemap: true
+((item: string) =>
+    item
+)