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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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#!/bin/sh

# Assembles the es6_runtime.js file from the inputs.

help() {
  cat <&2
Usage: build_runtime.sh [OPTIONS]
Options:
  --compiler=PATH/TO.JAR
  --js_output_file=FILENAME
EOF
  exit $1
}

dir="$(dirname $0)"
compiler="$dir/../../../../../../build/compiler.jar"
output=/dev/stdout

while [ $# -gt 0 ]; do
  arg=$1
  shift
  case "$arg" in
    (--*=*) set -- "${arg#*=}" "$@"; arg=${arg%%=*} ;;
  esac
  case "$arg" in
    (--help) help 0 ;;
    (--compiler) compiler=$1; shift ;;
    (--js_output_file) output=$1; shift ;;
    (*) echo "Unknown option: $arg" >&2; help 1 ;;
  esac
done

{
  cat license.js
  echo -e '\n// GENERATED FILE. DO NOT EDIT. REBUILD WITH build_runtime.sh.\n'
  java -jar $compiler "${args[@]}" \
       --formatting=PRETTY_PRINT \
       --noinject_libraries \
       --compilation_level=WHITESPACE_ONLY \
       --preserve_type_annotations \
       --language_in=ES6_STRICT \
       --language_out=ES5_STRICT \
       --js="$dir/es6/runtime.js" \
       --js="$dir/es6/object.js" \
      | sed 's/ *$//g'
  echo
} >| $output