Rewrite in TypeScript

.eslintrc.js

@@ -0,0 +1,12 @@
+module.exports = {
+  parser:  '@typescript-eslint/parser',
+  extends:  [
+    'plugin:@typescript-eslint/recommended',
+    'prettier/@typescript-eslint',
+    'plugin:prettier/recommended',
+  ],
+ parserOptions:  {
+    ecmaVersion:  2018,
+    sourceType:  'module',
+  },
+};

.gitignore

@@ -1 +1,2 @@
-node_modules
+/node_modules
+/lib

.npmignore

@@ -0,0 +1 @@
+/src

erb_transformer.rb

@@ -1,20 +1,24 @@
-delimiter = ARGV[0]
-engine = ARGV[1]
-handler = case engine
-  when 'erubi'
-    require 'erubi'
-    Erubi::Engine
-  when 'erubis'
-    require 'erubis'
-    Erubis::Eruby
-  when 'erb'
-    require 'erb'
-    ERB
-  else raise "Unknown templating engine `#{engine}`"
-end
+begin
+  delimiter = ARGV[0]
+  engine = ARGV[1]
+  handler = case engine
+    when 'erubi'
+      require 'erubi'
+      Erubi::Engine
+    when 'erubis'
+      require 'erubis'
+      Erubis::Eruby
+    when 'erb'
+      require 'erb'
+      ERB
+    else raise "Unknown templating engine `#{engine}`"
+  end
 
-if engine == 'erubi'
-  puts "#{delimiter}#{eval(handler.new(STDIN.read).src)}#{delimiter}"
-else
-  puts "#{delimiter}#{handler.new(STDIN.read).result}#{delimiter}"
-end
+  if engine == 'erubi'
+    puts "#{delimiter}#{eval(handler.new(STDIN.read).src)}#{delimiter}"
+  else
+    puts "#{delimiter}#{handler.new(STDIN.read).result}#{delimiter}"
+  end
+rescue => error
+  STDERR.puts error
+end