diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 1b5726bdc7b..4b2bde6089c 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -556,12 +556,14 @@ namespace ts {
             emitHelpers(bundle);
             emitSyntheticTripleSlashReferencesIfNeeded(bundle);
 
-            const pos = getTextPosWithWriteLine();
             for (const prepend of bundle.prepends) {
                 writeLine();
+                const pos = getTextPosWithWriteLine();
                 print(EmitHint.Unspecified, prepend, /*sourceFile*/ undefined);
+                if (bundleFileInfo) bundleFileInfo.push({ pos, end: writer.getTextPos(), kind: BundleFileSectionKind.Prepend, fileName: (prepend as UnparsedSource).fileName });
             }
 
+            const pos = getTextPosWithWriteLine();
             for (const sourceFile of bundle.sourceFiles) {
                 print(EmitHint.SourceFile, sourceFile, sourceFile);
             }
diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index cc8a50087c8..0d07434c0e4 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -2675,6 +2675,7 @@ namespace ts {
 
             const sections = textOrInputFiles.buildInfo ? mapPathOrType === "js" ? textOrInputFiles.buildInfo.js : textOrInputFiles.buildInfo.dts : undefined;
             if (sections) {
+                let setPos = false;
                 for (const section of sections) {
                     switch (section.kind) {
                         case BundleFileSectionKind.Prologue:
@@ -2698,9 +2699,13 @@ namespace ts {
                         case BundleFileSectionKind.Lib:
                             (libReferenceDirectives || (libReferenceDirectives = [])).push({ pos: -1, end: -1, fileName: section.fileName });
                             break;
+                        case BundleFileSectionKind.Prepend:
                         case BundleFileSectionKind.Text:
-                            // For now just set node.pos to this
-                            node.pos = section.pos;
+                            if (!setPos) {
+                                // For now just set node.pos to this
+                                node.pos = section.pos;
+                                setPos = true;
+                            }
                             break;
                         default:
                             Debug.assertNever(section);
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index f117d881bd8..ad1d48fd252 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -5440,6 +5440,7 @@ namespace ts {
         Reference = "reference",
         Type = "type",
         Lib = "lib",
+        Prepend = "prepend",
         Text = "text",
         // internal comments?
     }
@@ -5472,6 +5473,12 @@ namespace ts {
         fileName: string;
     }
 
+    /*@internal*/
+    export interface BundleFilePrepend extends BundleFileSectionBase {
+        kind: BundleFileSectionKind.Prepend;
+        fileName: string;
+    }
+
     /*@internal*/
     export interface BundleFileText extends BundleFileSectionBase {
         kind: BundleFileSectionKind.Text;
@@ -5479,7 +5486,7 @@ namespace ts {
 
     /*@internal*/
     export type BundleFileSection = BundleFilePrologue | BundleFileEmitHelpers |
-        BundleFileHasNoDefaultLib | BundleFileReference | BundleFileText;
+        BundleFileHasNoDefaultLib | BundleFileReference | BundleFilePrepend | BundleFileText;
 
     /*@internal*/
     export type BundleFileInfo = BundleFileSection[];
diff --git a/tests/baselines/reference/outFile-baseline-sectioned-sourcemaps.js b/tests/baselines/reference/outFile-baseline-sectioned-sourcemaps.js
index bbfad6ac703..643796c0699 100644
--- a/tests/baselines/reference/outFile-baseline-sectioned-sourcemaps.js
+++ b/tests/baselines/reference/outFile-baseline-sectioned-sourcemaps.js
@@ -724,6 +724,18 @@ sourceFile:../first_part3.ts
   "js": [
     {
       "pos": 0,
+      "end": 150,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 152,
+      "end": 478,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 480,
       "end": 516,
       "kind": "text"
     }
@@ -731,6 +743,18 @@ sourceFile:../first_part3.ts
   "dts": [
     {
       "pos": 0,
+      "end": 199,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 201,
+      "end": 344,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 346,
       "end": 365,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-emitHelpers-in-all-projects.js b/tests/baselines/reference/outFile-emitHelpers-in-all-projects.js
index fb7aee7d13a..fe20d4ab36e 100644
--- a/tests/baselines/reference/outFile-emitHelpers-in-all-projects.js
+++ b/tests/baselines/reference/outFile-emitHelpers-in-all-projects.js
@@ -1151,6 +1151,18 @@ class second2 extends second1 { }
     },
     {
       "pos": 599,
+      "end": 1043,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 1045,
+      "end": 1673,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 1675,
       "end": 2005,
       "kind": "text"
     }
@@ -1158,6 +1170,18 @@ class second2 extends second1 { }
   "dts": [
     {
       "pos": 0,
+      "end": 268,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 270,
+      "end": 485,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 487,
       "end": 575,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-emitHelpers-in-only-one-dependency-project.js b/tests/baselines/reference/outFile-emitHelpers-in-only-one-dependency-project.js
index 1175dbca11a..aac0dab4949 100644
--- a/tests/baselines/reference/outFile-emitHelpers-in-only-one-dependency-project.js
+++ b/tests/baselines/reference/outFile-emitHelpers-in-only-one-dependency-project.js
@@ -943,6 +943,18 @@ class second2 extends second1 { }
     },
     {
       "pos": 599,
+      "end": 749,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 751,
+      "end": 1379,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 1381,
       "end": 1417,
       "kind": "text"
     }
@@ -950,6 +962,18 @@ class second2 extends second1 { }
   "dts": [
     {
       "pos": 0,
+      "end": 199,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 201,
+      "end": 416,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 418,
       "end": 437,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-multiple-emitHelpers-in-all-projects.js b/tests/baselines/reference/outFile-multiple-emitHelpers-in-all-projects.js
index f8f1ce796df..40ac51c1550 100644
--- a/tests/baselines/reference/outFile-multiple-emitHelpers-in-all-projects.js
+++ b/tests/baselines/reference/outFile-multiple-emitHelpers-in-all-projects.js
@@ -1594,6 +1594,18 @@ secondsecond_part2Spread(...[10, 20, 30]);
     },
     {
       "pos": 1277,
+      "end": 1933,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 1935,
+      "end": 2779,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 2781,
       "end": 3323,
       "kind": "text"
     }
@@ -1601,6 +1613,18 @@ secondsecond_part2Spread(...[10, 20, 30]);
   "dts": [
     {
       "pos": 0,
+      "end": 332,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 334,
+      "end": 615,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 617,
       "end": 769,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-multiple-emitHelpers-in-different-projects.js b/tests/baselines/reference/outFile-multiple-emitHelpers-in-different-projects.js
index 4898a6cffa4..aba4e4427b0 100644
--- a/tests/baselines/reference/outFile-multiple-emitHelpers-in-different-projects.js
+++ b/tests/baselines/reference/outFile-multiple-emitHelpers-in-different-projects.js
@@ -1170,6 +1170,18 @@ class second2 extends second1 { }
     },
     {
       "pos": 1277,
+      "end": 1639,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 1641,
+      "end": 2269,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 2271,
       "end": 2519,
       "kind": "text"
     }
@@ -1177,6 +1189,18 @@ class second2 extends second1 { }
   "dts": [
     {
       "pos": 0,
+      "end": 263,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 265,
+      "end": 480,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 482,
       "end": 565,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-multiple-prologues-in-all-projects.js b/tests/baselines/reference/outFile-multiple-prologues-in-all-projects.js
index 80ce35e472d..c16fdc80276 100644
--- a/tests/baselines/reference/outFile-multiple-prologues-in-all-projects.js
+++ b/tests/baselines/reference/outFile-multiple-prologues-in-all-projects.js
@@ -913,6 +913,18 @@ class C {
     },
     {
       "pos": 62,
+      "end": 212,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 214,
+      "end": 540,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 542,
       "end": 578,
       "kind": "text"
     }
@@ -920,6 +932,18 @@ class C {
   "dts": [
     {
       "pos": 0,
+      "end": 199,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 201,
+      "end": 344,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 346,
       "end": 365,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-multiple-prologues-in-different-projects.js b/tests/baselines/reference/outFile-multiple-prologues-in-different-projects.js
index faa2092aaec..4e0e4516b0d 100644
--- a/tests/baselines/reference/outFile-multiple-prologues-in-different-projects.js
+++ b/tests/baselines/reference/outFile-multiple-prologues-in-different-projects.js
@@ -845,6 +845,18 @@ class C {
     },
     {
       "pos": 46,
+      "end": 196,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 198,
+      "end": 524,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 526,
       "end": 562,
       "kind": "text"
     }
@@ -852,6 +864,18 @@ class C {
   "dts": [
     {
       "pos": 0,
+      "end": 199,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 201,
+      "end": 344,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 346,
       "end": 365,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-shebang-in-all-projects.js b/tests/baselines/reference/outFile-shebang-in-all-projects.js
index 093a4c1563c..4ea347f8fca 100644
--- a/tests/baselines/reference/outFile-shebang-in-all-projects.js
+++ b/tests/baselines/reference/outFile-shebang-in-all-projects.js
@@ -772,6 +772,18 @@ namespace N {
   "js": [
     {
       "pos": 33,
+      "end": 183,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 185,
+      "end": 511,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 513,
       "end": 549,
       "kind": "text"
     }
@@ -779,6 +791,18 @@ namespace N {
   "dts": [
     {
       "pos": 33,
+      "end": 232,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 234,
+      "end": 377,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 379,
       "end": 398,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-shebang-in-only-one-dependency-project.js b/tests/baselines/reference/outFile-shebang-in-only-one-dependency-project.js
index 00b8eece4f0..62256b137b0 100644
--- a/tests/baselines/reference/outFile-shebang-in-only-one-dependency-project.js
+++ b/tests/baselines/reference/outFile-shebang-in-only-one-dependency-project.js
@@ -745,6 +745,18 @@ namespace N {
   "js": [
     {
       "pos": 35,
+      "end": 185,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 187,
+      "end": 513,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 515,
       "end": 551,
       "kind": "text"
     }
@@ -752,6 +764,18 @@ namespace N {
   "dts": [
     {
       "pos": 35,
+      "end": 234,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 236,
+      "end": 379,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 381,
       "end": 400,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-strict-in-all-projects.js b/tests/baselines/reference/outFile-strict-in-all-projects.js
index ea188b9f883..2a54bb6e1fb 100644
--- a/tests/baselines/reference/outFile-strict-in-all-projects.js
+++ b/tests/baselines/reference/outFile-strict-in-all-projects.js
@@ -786,6 +786,18 @@ sourceFile:../first_part3.ts
     },
     {
       "pos": 15,
+      "end": 165,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 167,
+      "end": 493,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 495,
       "end": 531,
       "kind": "text"
     }
@@ -793,6 +805,18 @@ sourceFile:../first_part3.ts
   "dts": [
     {
       "pos": 0,
+      "end": 199,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 201,
+      "end": 344,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 346,
       "end": 365,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-strict-in-one-dependency.js b/tests/baselines/reference/outFile-strict-in-one-dependency.js
index fbd04d5f03c..327a3da4d57 100644
--- a/tests/baselines/reference/outFile-strict-in-one-dependency.js
+++ b/tests/baselines/reference/outFile-strict-in-one-dependency.js
@@ -756,6 +756,18 @@ sourceFile:../first_part3.ts
     },
     {
       "pos": 15,
+      "end": 165,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 167,
+      "end": 493,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 495,
       "end": 531,
       "kind": "text"
     }
@@ -763,6 +775,18 @@ sourceFile:../first_part3.ts
   "dts": [
     {
       "pos": 0,
+      "end": 199,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 201,
+      "end": 344,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 346,
       "end": 365,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-triple-slash-refs-in-all-projects.js b/tests/baselines/reference/outFile-triple-slash-refs-in-all-projects.js
index 56f37f9c3c8..0c6bdf10d85 100644
--- a/tests/baselines/reference/outFile-triple-slash-refs-in-all-projects.js
+++ b/tests/baselines/reference/outFile-triple-slash-refs-in-all-projects.js
@@ -875,6 +875,18 @@ declare class secondsecond_part1 { }
   "js": [
     {
       "pos": 0,
+      "end": 198,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 200,
+      "end": 577,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 579,
       "end": 663,
       "kind": "text"
     }
@@ -900,6 +912,18 @@ declare class secondsecond_part1 { }
     },
     {
       "pos": 160,
+      "end": 410,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 412,
+      "end": 609,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 611,
       "end": 681,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-triple-slash-refs-in-one-project.js b/tests/baselines/reference/outFile-triple-slash-refs-in-one-project.js
index 8fb60cacdfb..aaa174dcd86 100644
--- a/tests/baselines/reference/outFile-triple-slash-refs-in-one-project.js
+++ b/tests/baselines/reference/outFile-triple-slash-refs-in-one-project.js
@@ -803,6 +803,18 @@ declare class secondsecond_part1 { }
   "js": [
     {
       "pos": 0,
+      "end": 150,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 152,
+      "end": 529,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 531,
       "end": 567,
       "kind": "text"
     }
@@ -816,6 +828,18 @@ declare class secondsecond_part1 { }
     },
     {
       "pos": 57,
+      "end": 256,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 258,
+      "end": 455,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 457,
       "end": 476,
       "kind": "text"
     }
diff --git a/tests/baselines/reference/outFile-when-final-project-is-not-composite-but-uses-project-references.js b/tests/baselines/reference/outFile-when-final-project-is-not-composite-but-uses-project-references.js
index d6005021eb4..a5e155089db 100644
--- a/tests/baselines/reference/outFile-when-final-project-is-not-composite-but-uses-project-references.js
+++ b/tests/baselines/reference/outFile-when-final-project-is-not-composite-but-uses-project-references.js
@@ -724,6 +724,18 @@ sourceFile:../first_part3.ts
   "js": [
     {
       "pos": 0,
+      "end": 150,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.js"
+    },
+    {
+      "pos": 152,
+      "end": 478,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.js"
+    },
+    {
+      "pos": 480,
       "end": 516,
       "kind": "text"
     }
@@ -731,6 +743,18 @@ sourceFile:../first_part3.ts
   "dts": [
     {
       "pos": 0,
+      "end": 199,
+      "kind": "prepend",
+      "fileName": "/src/first/bin/first-output.d.ts"
+    },
+    {
+      "pos": 201,
+      "end": 344,
+      "kind": "prepend",
+      "fileName": "/src/2/second-output.d.ts"
+    },
+    {
+      "pos": 346,
       "end": 365,
       "kind": "text"
     }