Fix #37: Minify Javascript

.circleci/config.yml

@@ -17,7 +17,7 @@ jobs:
             # Set up the Debian testing repo, and then install g++ from there...
             sudo bash -c "echo \"deb http://ftp.us.debian.org/debian testing main contrib non-free\" >> /etc/apt/sources.list"
             sudo apt-get update
-            sudo apt-get install node-less cmake build-essential clang-format-6.0 flake8
+            sudo apt-get install node-less cmake build-essential clang-format-6.0 flake8 uglifyjs
             sudo apt-get install -t testing g++-8
             sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6
             sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 80 --slave /usr/bin/g++ g++ /usr/bin/g++-8

Makefile

@@ -102,6 +102,8 @@ build/pyodide.asm.js: src/main.bc src/jsimport.bc src/jsproxy.bc src/js2python.b
 
 build/pyodide.asm.data: root/.built
 	python2 $(FILEPACKAGER) build/pyodide.asm.data --preload root/lib@lib --js-output=build/pyodide.asm.data.js
+	uglifyjs build/pyodide.asm.data.js -o build/pyodide.asm.data.js
+
 
 build/pyodide_dev.js: src/pyodide.js
 	cp $< $@

README.md

@@ -16,7 +16,10 @@ These instructions were tested on Linux. OSX should be substantively the same.
 
 Make sure the prerequisites for [emsdk](https://github.com/juj/emsdk) are installed.
 
-Install [lessc](https://lesscss.org/) to compile less to css.
+Additional build prerequisites are:
+
+- [lessc](https://lesscss.org/) to compile less to css.
+- [uglifyjs](https://github.com/mishoo/UglifyJS) to minify Javascript builds.
 
 Type `make`.
 

packager.sh

 #!/bin/sh
 python2 emsdk/emsdk/emscripten/tag-1.38.4/tools/file_packager.py build/$1.data --preload $2 --js-output=build/$1.js --export-name=pyodide --exclude \*.wasm.pre --exclude __pycache__
+uglifyjs build/$1.js -o build/$1.js