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closure_compiler's Introduction

closure-compiler

Nim wrapper to closure compiler.

Usage example: nakefile

import nake
import browsers
import closure_compiler

task "js", "Create Javascript version":
    direShell nimExe, "js", "main"
    closure_compiler.compileFileAndRewrite("nimcache" / "main.js", ADVANCED_OPTIMIZATIONS)
    openDefaultBrowser "main.html"

More about nake

Usage example: command line

nim js main # Compile main.nim and save it to nimcache/main.js
closure_compiler nimcache/main.js # Run closure compiler

Why wrapper

The Javascript code generated by Nim is incompatible with Closure compilers advanced optimization. This wrapper fixes those issues by providing an externs list to the compiler. The list is formed by analizing the source code.

Performance considerations

The wrapper will first try to find java executable and use it to run closure-compiler embedded in the package. If java is not found it will fall back to web API. Please note that web API has some limitations:

  • It is slower than locally installed version.
  • There is an input file size limitation.
  • It may fail with timeout if your generated js file is complex enough.
  • It doesn't support source map generation.

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