diff --git a/ext/html-preview.pm b/ext/html-preview.pm
index 324d5c6..4d5fe01 100644
--- a/ext/html-preview.pm
+++ b/ext/html-preview.pm
@@ -21,23 +21,20 @@
 
 use strict;
 
-sub vscode_convert_texinfo_image_uri {
+sub vscode_convert_image_uri {
     my ( $self, $cmdname, $command, $args ) = @_;
 
     my $filename = $args->[0]->{'monospacetext'};
-    if (   defined($filename)
-        && rindex( $filename, 'http://',  0 ) == -1
-        && rindex( $filename, 'https://', 0 ) == -1 )
-    {
-        $self->set_conf( 'IMAGE_LINK_PREFIX',
-            $self->{'parser'}->{'values'}->{'__vscode_texinfo_image_uri_base'}
-        );
-    }
-    return &{ $self->default_commands_conversion($cmdname) }
-        ( $self, $cmdname, $command, $args );
+    my $prefix
+        = (    defined($filename)
+            && rindex( $filename, 'http://',  0 ) == -1
+            && rindex( $filename, 'https://', 0 ) == -1 )
+        ? $self->{'parser'}->{'values'}->{'__vscode_texinfo_image_uri_base'}
+        : undef;
+    $self->set_conf( 'IMAGE_LINK_PREFIX', $prefix );
+    return &{ $self->default_commands_conversion($cmdname) }(@_);
 }
 
-texinfo_register_command_formatting( 'image',
-    \&vscode_convert_texinfo_image_uri );
+texinfo_register_command_formatting( 'image', \&vscode_convert_image_uri );
 
 1;
diff --git a/scripts/make-vsix.js b/scripts/make-vsix.js
index 420bed7..1b2f489 100644
--- a/scripts/make-vsix.js
+++ b/scripts/make-vsix.js
@@ -6,7 +6,7 @@
  * this notice are preserved. This file is offered as-is, without any warranty.
  */
 
-const fs = require('fs')
+const fs = require('fs');
 const yazl = require('yazl');
 
 async function addPathToZipFile(zipFile, path) {
diff --git a/scripts/package.sh b/scripts/package.sh
index 2877fb5..a4884dd 100755
--- a/scripts/package.sh
+++ b/scripts/package.sh
@@ -19,10 +19,11 @@ minify-xml --output extension.vsixmanifest{,}
 cd extension
 # Minify JSON files.
 json -j0 -I -e "$PACKAGE_JSON_CLEANUP_JS" -f package.json
-sed -i '' -e '2d' package.json
+perl -pi -e 'chomp if eof' package.json
 json5 -o language-configuration.json{,}
 # Remove comments from Markdown files.
-sed -i '' -e '1,8d' README.md CHANGELOG.md
+tail -n +9 README.md > _ && mv _ README.md
+tail -n +9 CHANGELOG.md > _ && mv _ CHANGELOG.md
 cd ext
 # Minify Perl scripts.
 if [ -x "$(command -v perltidy)" ]; then