diff --git a/test/fixtures/bin/6to5/dir --out-dir --source-maps-inline/out-files/lib/bar/bar.js b/test/fixtures/bin/6to5/dir --out-dir --source-maps-inline/out-files/lib/bar/bar.js
index 9a3f332ee4..00b4a82321 100644
--- a/test/fixtures/bin/6to5/dir --out-dir --source-maps-inline/out-files/lib/bar/bar.js	
+++ b/test/fixtures/bin/6to5/dir --out-dir --source-maps-inline/out-files/lib/bar/bar.js	
@@ -1,4 +1,4 @@
 "use strict";
 
 var Test = function Test() {};
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNyYy9iYXIvYmFyLmpzIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiI7O0lBQU0sSUFBSSxZQUFKLElBQUkiLCJmaWxlIjoic3JjL2Jhci9iYXIuanMiLCJzb3VyY2VzQ29udGVudCI6WyJjbGFzcyBUZXN0IHtcblxufSJdfQ==
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNyYy9iYXIvYmFyLmpzIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiI7O0lBQU0sZ0JBQUEiLCJmaWxlIjoic3JjL2Jhci9iYXIuanMiLCJzb3VyY2VzQ29udGVudCI6WyJjbGFzcyBUZXN0IHtcblxufSJdfQ==
diff --git a/test/fixtures/bin/6to5/dir --out-dir --source-maps-inline/out-files/lib/foo.js b/test/fixtures/bin/6to5/dir --out-dir --source-maps-inline/out-files/lib/foo.js
index 86d5ad9c4c..084ca3ad9e 100644
--- a/test/fixtures/bin/6to5/dir --out-dir --source-maps-inline/out-files/lib/foo.js	
+++ b/test/fixtures/bin/6to5/dir --out-dir --source-maps-inline/out-files/lib/foo.js	
@@ -3,4 +3,4 @@
 arr.map(function (x) {
   return x * MULTIPLIER;
 });
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNyYy9mb28uanMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7QUFBQSxHQUFHLENBQUMsR0FBRyxDQUFDLFVBQUEsQ0FBQztTQUFJLENBQUMsR0FBRyxVQUFVO0NBQUEsQ0FBQyxDQUFDIiwiZmlsZSI6InNyYy9mb28uanMiLCJzb3VyY2VzQ29udGVudCI6WyJhcnIubWFwKHggPT4geCAqIE1VTFRJUExJRVIpOyJdfQ==
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNyYy9mb28uanMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7QUFBQSxJQUFJLElBQUksVUFBQTtTQUFLLElBQUkiLCJmaWxlIjoic3JjL2Zvby5qcyIsInNvdXJjZXNDb250ZW50IjpbImFyci5tYXAoeCA9PiB4ICogTVVMVElQTElFUik7Il19
diff --git a/test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/bar/bar.js.map b/test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/bar/bar.js.map
index 84d0aa2ac1..11bc242c46 100644
--- a/test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/bar/bar.js.map	
+++ b/test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/bar/bar.js.map	
@@ -1 +1 @@
-{"version":3,"sources":["src/bar/bar.js"],"names":[],"mappings":";;IAAM,IAAI,YAAJ,IAAI","file":"src/bar/bar.js","sourcesContent":["class Test {\n\n}"]}
+{"version":3,"sources":["src/bar/bar.js"],"names":[],"mappings":";;IAAM,gBAAA","file":"src/bar/bar.js","sourcesContent":["class Test {\n\n}"]}
diff --git a/test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/foo.js.map b/test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/foo.js.map
index 89de3bd5e5..fe99a2615b 100644
--- a/test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/foo.js.map	
+++ b/test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/foo.js.map	
@@ -1 +1 @@
-{"version":3,"sources":["src/foo.js"],"names":[],"mappings":";;AAAA,GAAG,CAAC,GAAG,CAAC,UAAA,CAAC;SAAI,CAAC,GAAG,UAAU;CAAA,CAAC,CAAC","file":"src/foo.js","sourcesContent":["arr.map(x => x * MULTIPLIER);"]}
+{"version":3,"sources":["src/foo.js"],"names":[],"mappings":";;AAAA,IAAI,IAAI,UAAA;SAAK,IAAI","file":"src/foo.js","sourcesContent":["arr.map(x => x * MULTIPLIER);"]}
diff --git a/test/fixtures/bin/6to5/filename --out-file --source-maps-inline/out-files/script2.js b/test/fixtures/bin/6to5/filename --out-file --source-maps-inline/out-files/script2.js
index 31da0b4f1a..7444dee287 100644
--- a/test/fixtures/bin/6to5/filename --out-file --source-maps-inline/out-files/script2.js	
+++ b/test/fixtures/bin/6to5/filename --out-file --source-maps-inline/out-files/script2.js	
@@ -4,4 +4,4 @@ arr.map(function (x) {
   return x * MULTIPLIER;
 });
 
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNjcmlwdC5qcyJdLCJuYW1lcyI6W10sIm1hcHBpbmdzIjoiOztBQUFBLEdBQUcsQ0FBQyxHQUFHLENBQUMsVUFBQSxDQUFDO1NBQUksQ0FBQyxHQUFHLFVBQVU7Q0FBQSxDQUFDLENBQUMiLCJmaWxlIjoic2NyaXB0Mi5qcyIsInNvdXJjZXNDb250ZW50IjpbImFyci5tYXAoeCA9PiB4ICogTVVMVElQTElFUik7Il19
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNjcmlwdC5qcyJdLCJuYW1lcyI6W10sIm1hcHBpbmdzIjoiOztBQUFBLElBQUksSUFBSSxVQUFBO1NBQUssSUFBSSIsImZpbGUiOiJzY3JpcHQyLmpzIiwic291cmNlc0NvbnRlbnQiOlsiYXJyLm1hcCh4ID0+IHggKiBNVUxUSVBMSUVSKTsiXX0=
diff --git a/test/fixtures/bin/6to5/filenames --out-file --source-maps-inline/out-files/script3.js b/test/fixtures/bin/6to5/filenames --out-file --source-maps-inline/out-files/script3.js
index 6523ba9228..0630d2870d 100644
--- a/test/fixtures/bin/6to5/filenames --out-file --source-maps-inline/out-files/script3.js	
+++ b/test/fixtures/bin/6to5/filenames --out-file --source-maps-inline/out-files/script3.js	
@@ -7,5 +7,4 @@ arr.map(function (x) {
   return x * MULTIPLIER;
 });
 
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNjcmlwdC5qcyIsInNjcmlwdDIuanMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7SUFBTSxJQUFJLFlBQUosSUFBSTs7OztBQ0FWLEdBQUcsQ0FBQyxHQUFHLENBQUMsVUFBQSxDQUFDO1NBQUksQ0FBQyxHQUFHLFVBQVU7Q0FBQSxDQUFDLENBQUMiLCJmaWxlIjoic2NyaXB0My5qcyIsInNvdXJjZXNDb250ZW50IjpbImNsYXNzIFRlc3Qge1xuXG59IiwiYXJyLm1hcCh4ID0+IHggKiBNVUxUSVBMSUVSKTsiXX0=
-
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNjcmlwdC5qcyIsInNjcmlwdDIuanMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7SUFBTSxnQkFBQTs7OztBQ0FOLElBQUksSUFBSSxVQUFBO1NBQUssSUFBSSIsImZpbGUiOiJzY3JpcHQzLmpzIiwic291cmNlc0NvbnRlbnQiOlsiY2xhc3MgVGVzdCB7XG5cbn0iLCJhcnIubWFwKHggPT4geCAqIE1VTFRJUExJRVIpOyJdfQ==
diff --git a/test/fixtures/bin/6to5/filenames --out-file --source-maps/out-files/script3.js.map b/test/fixtures/bin/6to5/filenames --out-file --source-maps/out-files/script3.js.map
index 70c2329b98..6645537c9e 100644
--- a/test/fixtures/bin/6to5/filenames --out-file --source-maps/out-files/script3.js.map	
+++ b/test/fixtures/bin/6to5/filenames --out-file --source-maps/out-files/script3.js.map	
@@ -1 +1 @@
-{"version":3,"sources":["script.js","script2.js"],"names":[],"mappings":";;IAAM,IAAI,YAAJ,IAAI;;;;ACAV,GAAG,CAAC,GAAG,CAAC,UAAA,CAAC;SAAI,CAAC,GAAG,UAAU;CAAA,CAAC,CAAC","file":"script3.js","sourcesContent":["class Test {\n\n}","arr.map(x => x * MULTIPLIER);"]}
+{"version":3,"sources":["script.js","script2.js"],"names":[],"mappings":";;IAAM,gBAAA;;;;ACAN,IAAI,IAAI,UAAA;SAAK,IAAI","file":"script3.js","sourcesContent":["class Test {\n\n}","arr.map(x => x * MULTIPLIER);"]}
diff --git a/test/fixtures/bin/6to5/stdin --out-file --source-maps/out-files/test.js.map b/test/fixtures/bin/6to5/stdin --out-file --source-maps/out-files/test.js.map
index 78347b03c3..4fac8383c7 100644
--- a/test/fixtures/bin/6to5/stdin --out-file --source-maps/out-files/test.js.map	
+++ b/test/fixtures/bin/6to5/stdin --out-file --source-maps/out-files/test.js.map	
@@ -1 +1 @@
-{"version":3,"sources":["stdin"],"names":[],"mappings":";;AAAA,GAAG,CAAC,GAAG,CAAC,UAAA,CAAC;SAAI,CAAC,GAAG,CAAC;CAAA,CAAC,CAAC","file":"test.js","sourcesContent":["arr.map(x => x * x);"]}
+{"version":3,"sources":["stdin"],"names":[],"mappings":";;AAAA,IAAI,IAAI,UAAA;SAAK,IAAI","file":"test.js","sourcesContent":["arr.map(x => x * x);"]}
diff --git a/test/fixtures/bin/6to5/stdin --source-maps-inline/stdout.txt b/test/fixtures/bin/6to5/stdin --source-maps-inline/stdout.txt
index b21594bbfc..1383aa3463 100644
--- a/test/fixtures/bin/6to5/stdin --source-maps-inline/stdout.txt	
+++ b/test/fixtures/bin/6to5/stdin --source-maps-inline/stdout.txt	
@@ -4,4 +4,4 @@ arr.map(function (x) {
   return x * x;
 });
 
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0ZGluIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiI7O0FBQUEsR0FBRyxDQUFDLEdBQUcsQ0FBQyxVQUFBLENBQUM7U0FBSSxDQUFDLEdBQUcsQ0FBQztDQUFBLENBQUMsQ0FBQyIsImZpbGUiOiJzdGRvdXQiLCJzb3VyY2VzQ29udGVudCI6WyJhcnIubWFwKHggPT4geCAqIHgpOyJdfQ==
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0ZGluIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiI7O0FBQUEsSUFBSSxJQUFJLFVBQUE7U0FBSyxJQUFJIiwiZmlsZSI6InN0ZG91dCIsInNvdXJjZXNDb250ZW50IjpbImFyci5tYXAoeCA9PiB4ICogeCk7Il19
diff --git a/test/fixtures/transformation/source-maps/arrow-function/source-mappings.json b/test/fixtures/transformation/source-maps/arrow-function/source-mappings.json
index d6c4b7d064..b01b297741 100644
--- a/test/fixtures/transformation/source-maps/arrow-function/source-mappings.json
+++ b/test/fixtures/transformation/source-maps/arrow-function/source-mappings.json
@@ -1,10 +1,10 @@
 [{
   "original": {
     "line": 1,
-    "column": 18
+    "column": 13
   },
   "generated": {
     "line": 4,
-    "column": 14
+    "column": 10
   }
 }]
diff --git a/test/fixtures/transformation/source-maps/full/source-map.json b/test/fixtures/transformation/source-maps/full/source-map.json
index 81d70ba9d8..fa0c12e5d0 100644
--- a/test/fixtures/transformation/source-maps/full/source-map.json
+++ b/test/fixtures/transformation/source-maps/full/source-map.json
@@ -3,6 +3,6 @@
   "file": "source-maps/full/expected.js",
   "sources": ["source-maps/full/actual.js"],
   "names": [],
-  "mappings": ";;AAAA,GAAG,CAAC,GAAG,CAAC,UAAA,CAAC;SAAI,CAAC,GAAG,CAAC;CAAA,CAAC,CAAC",
+  "mappings": ";;AAAA,IAAI,IAAI,UAAA;SAAK,IAAI",
   "sourcesContent": ["arr.map(x => x * x);"]
 }
diff --git a/test/fixtures/transformation/source-maps/inline/expected.js b/test/fixtures/transformation/source-maps/inline/expected.js
index ade09104cb..30517e48d0 100644
--- a/test/fixtures/transformation/source-maps/inline/expected.js
+++ b/test/fixtures/transformation/source-maps/inline/expected.js
@@ -3,4 +3,4 @@
 arr.map(function (x) {
   return x * x;
 });
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNvdXJjZS1tYXBzL2lubGluZS9hY3R1YWwuanMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7QUFBQSxHQUFHLENBQUMsR0FBRyxDQUFDLFVBQUEsQ0FBQztTQUFJLENBQUMsR0FBRyxDQUFDO0NBQUEsQ0FBQyxDQUFDIiwiZmlsZSI6InNvdXJjZS1tYXBzL2lubGluZS9leHBlY3RlZC5qcyIsInNvdXJjZXNDb250ZW50IjpbImFyci5tYXAoeCA9PiB4ICogeCk7Il19
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInNvdXJjZS1tYXBzL2lubGluZS9hY3R1YWwuanMiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7QUFBQSxJQUFJLElBQUksVUFBQTtTQUFLLElBQUkiLCJmaWxlIjoic291cmNlLW1hcHMvaW5saW5lL2V4cGVjdGVkLmpzIiwic291cmNlc0NvbnRlbnQiOlsiYXJyLm1hcCh4ID0+IHggKiB4KTsiXX0=