dropped support for undocumented module-format aliases

Author: moonglum

lib/bundle/config.js

@@ -8,8 +8,6 @@ let { nodeResolve } = require("@rollup/plugin-node-resolve");
 
 let MODULE_FORMATS = { // maps faucet identifiers to Rollup identifiers
 	esm: true,
-	es: "esm", // alias
-	es6: "esm", // alias
 	umd: true,
 	amd: true,
 	commonjs: "cjs",