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-rw-r--r--lib/sourcemap.js4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/sourcemap.js b/lib/sourcemap.js
index c2587c88..94966a6a 100644
--- a/lib/sourcemap.js
+++ b/lib/sourcemap.js
@@ -144,7 +144,9 @@ function SourceMap(options) {
add(source, gen_line, gen_col, orig_line, orig_col, name);
} : add,
setSourceContent: sources_content ? function(source, content) {
- sources_content[source] = content;
+ if (!(source in sources_content)) {
+ sources_content[source] = content;
+ }
} : noop,
toString: function() {
return JSON.stringify({