Converting ES6 to ES5 on the command line
I use the TypeScript compiler for this, since its output is more minimal than Babel's.
The following will transpile all src/*.js files into a file build.js:
npm install typescript
npx tsc src/*.js --target ES5 --allowJs --outFile build.js
The output will only transpile ES6 syntax. It will not include any polyfills for missing APIs.
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