From 5ed1b04dc8aa5961189e836162fd3cafaa5525d0 Mon Sep 17 00:00:00 2001
From: liuxingbaoyu <30521560+liuxingbaoyu@users.noreply.github.com>
Date: Tue, 21 Feb 2023 04:11:36 +0800
Subject: [PATCH 1/2] fix

---
 packages/babel-generator/src/source-map.ts |  2 +-
 packages/babel-generator/test/index.js     | 34 ++++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/packages/babel-generator/src/source-map.ts b/packages/babel-generator/src/source-map.ts
index 634b41fb60e0..6c8e9c44411e 100644
--- a/packages/babel-generator/src/source-map.ts
+++ b/packages/babel-generator/src/source-map.ts
@@ -53,7 +53,7 @@ export default class SourceMap {
     if (opts.inputSourceMap) {
       this._inputMap = new TraceMap(opts.inputSourceMap);
       const resolvedSources = this._inputMap.resolvedSources;
-      if (resolvedSources.length) {
+      if (resolvedSources.length && this._inputMap.sourcesContent) {
         for (let i = 0; i < resolvedSources.length; i++) {
           setSourceContent(
             map,
diff --git a/packages/babel-generator/test/index.js b/packages/babel-generator/test/index.js
index ab84ce99ed86..cc875943e5c8 100644
--- a/packages/babel-generator/test/index.js
+++ b/packages/babel-generator/test/index.js
@@ -880,6 +880,40 @@ describe("generation", function () {
       });"
     `);
   });
+
+  it("inputSourceMap without sourcesContent", () => {
+    const ast = parse("var t = x => x * x;");
+
+    expect(
+      generate(ast, {
+        sourceMaps: true,
+        inputSourceMap: {
+          version: 3,
+          names: ["t", "x"],
+          sources: ["source-maps/arrow-function/input.js"],
+          mappings:
+            "AAAA,IAAIA,CAAC,GAAG,SAAJA,CAACA,CAAGC,CAAC;EAAA,OAAIA,CAAC,GAAGA,CAAC;AAAA",
+        },
+      }).map,
+    ).toMatchInlineSnapshot(`
+      Object {
+        "file": undefined,
+        "mappings": "AAAA,IAAIA,CAAC,GAAGC,CAAA,IAAAA,CAAA,GAAJA,CAAC",
+        "names": Array [
+          "t",
+          "x",
+        ],
+        "sourceRoot": undefined,
+        "sources": Array [
+          "source-maps/arrow-function/input.js",
+        ],
+        "sourcesContent": Array [
+          null,
+        ],
+        "version": 3,
+      }
+    `);
+  });
 });
 
 describe("programmatic generation", function () {

From ce9851cb806cd487403eb883d3ff9c285565b6da Mon Sep 17 00:00:00 2001
From: liuxingbaoyu <30521560+liuxingbaoyu@users.noreply.github.com>
Date: Tue, 21 Feb 2023 04:23:47 +0800
Subject: [PATCH 2/2] improve

---
 packages/babel-generator/src/source-map.ts | 4 ++--
 packages/babel-generator/test/index.js     | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/babel-generator/src/source-map.ts b/packages/babel-generator/src/source-map.ts
index 6c8e9c44411e..fa27a87cfa58 100644
--- a/packages/babel-generator/src/source-map.ts
+++ b/packages/babel-generator/src/source-map.ts
@@ -53,12 +53,12 @@ export default class SourceMap {
     if (opts.inputSourceMap) {
       this._inputMap = new TraceMap(opts.inputSourceMap);
       const resolvedSources = this._inputMap.resolvedSources;
-      if (resolvedSources.length && this._inputMap.sourcesContent) {
+      if (resolvedSources.length) {
         for (let i = 0; i < resolvedSources.length; i++) {
           setSourceContent(
             map,
             resolvedSources[i],
-            this._inputMap.sourcesContent[i],
+            this._inputMap.sourcesContent?.[i],
           );
         }
       }
diff --git a/packages/babel-generator/test/index.js b/packages/babel-generator/test/index.js
index cc875943e5c8..b5816f24b710 100644
--- a/packages/babel-generator/test/index.js
+++ b/packages/babel-generator/test/index.js
@@ -908,7 +908,7 @@ describe("generation", function () {
           "source-maps/arrow-function/input.js",
         ],
         "sourcesContent": Array [
-          null,
+          undefined,
         ],
         "version": 3,
       }