# Runtime selection
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For a language, you can optionally specify a particular runtime. The following table shows the supported languages and their available runtimes.


| Language | Available runtimes | 
| --- | --- | 
| Python |  `python`  | 
| JavaScript |  `nodejs` , `deno`  | 
| TypeScript |  `nodejs` , `deno`  | 

**Note**  
For the `nodejs` runtime, we support CommonJS (CJS) modules for JavaScript and ECMAScript (ESM) modules for TypeScript.