them. If you are targeting < ES6 environments, use `/** @const */ var`.
<a name="codegen-options"></a>
+
+#### Conditional compilation, API
+You can also use conditional compilation via the programmatic API. With the difference that the
+property name is `global_defs` and is a compressor property:
+
+```js
+uglifyJS.minify([ "input.js"], {
+ compress: {
+ dead_code: true,
+ global_defs: {
+ DEBUG: false
+ }
+ }
+});
+```
+
## Beautifier options
The code generator tries to output shortest code possible by default. In