From e7be2e408d1e6c968ef7cb791b5cee1af1aec72e Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Mon, 2 Aug 2021 08:54:13 +0200
Subject: [PATCH] insert inner source only when used

---
 .../streamChunksOfCombinedSourceMap.js        | 25 +++++++++++++------
 test/SourceMapSource.js                       |  8 +++---
 2 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/lib/helpers/streamChunksOfCombinedSourceMap.js b/lib/helpers/streamChunksOfCombinedSourceMap.js
index 973057f..468e970 100644
--- a/lib/helpers/streamChunksOfCombinedSourceMap.js
+++ b/lib/helpers/streamChunksOfCombinedSourceMap.js
@@ -214,6 +214,15 @@ const streamChunksOfCombinedSourceMap = (
 				if (removeInnerSource) {
 					onChunk(chunk, generatedLine, generatedColumn, -1, -1, -1, -1);
 					return;
+				} else {
+					if (sourceIndexMapping[sourceIndex] === -2) {
+						let globalIndex = sourceMapping.get(innerSourceName);
+						if (globalIndex === undefined) {
+							sourceMapping.set(source, (globalIndex = sourceMapping.size));
+							onSource(globalIndex, innerSourceName, innerSource);
+						}
+						sourceIndexMapping[sourceIndex] = globalIndex;
+					}
 				}
 			}
 
@@ -255,6 +264,8 @@ const streamChunksOfCombinedSourceMap = (
 			if (source === innerSourceName) {
 				innerSourceIndex = i;
 				if (innerSource !== undefined) sourceContent = innerSource;
+				else innerSource = sourceContent;
+				sourceIndexMapping[i] = -2;
 				streamChunksOfSourceMap(
 					sourceContent,
 					innerSourceMap,
@@ -296,14 +307,14 @@ const streamChunksOfCombinedSourceMap = (
 					false,
 					columns
 				);
-				if (removeInnerSource) return;
-			}
-			let globalIndex = sourceMapping.get(source);
-			if (globalIndex === undefined) {
-				sourceMapping.set(source, (globalIndex = sourceMapping.size));
-				onSource(globalIndex, source, sourceContent);
+			} else {
+				let globalIndex = sourceMapping.get(source);
+				if (globalIndex === undefined) {
+					sourceMapping.set(source, (globalIndex = sourceMapping.size));
+					onSource(globalIndex, source, sourceContent);
+				}
+				sourceIndexMapping[i] = globalIndex;
 			}
-			sourceIndexMapping[i] = globalIndex;
 		},
 		(i, name) => {
 			nameIndexMapping[i] = -2;
diff --git a/test/SourceMapSource.js b/test/SourceMapSource.js
index 60ad013..3e4b7a5 100644
--- a/test/SourceMapSource.js
+++ b/test/SourceMapSource.js
@@ -68,22 +68,22 @@ describe("SourceMapSource", () => {
 		2:0 -> [hello-world.txt] 2:0, :7, :13 -> [hello-world.txt] 2:10
 		3:0 -> [text] 3:11, :7, :8 -> [text] 3:17",
 		  "file": "x",
-		  "mappings": "YCAAA,K,CAAMC;AACN,O,MAAU;ADCC,O,CAAM",
+		  "mappings": "YAAAA,K,CAAMC;AACN,O,MAAU;ACCC,O,CAAM",
 		  "names": Array [
 		    "Hello",
 		    "World",
 		  ],
 		  "sources": Array [
-		    "text",
 		    "hello-world.txt",
+		    "text",
 		  ],
 		  "sourcesContent": Array [
 		    "Hello World
 		is a test string
-		Translate: Other text",
+		",
 		    "Hello World
 		is a test string
-		",
+		Translate: Other text",
 		  ],
 		  "version": 3,
 		}