Command to easily create alias - bash

Question

I'm looking for a simple command that would allow me to create a terminal alias to another command from the command line and preferably use it without having to restart my terminal.
The use case is as follows, I just created a small bash script and put it on gist.
# Babel in your project
npm i json -g
npm install --save-dev babel-core babel-cli babel-preset-es2015 babel-preset-react
json -f package.json -I -e 'this.scripts.test = "mocha --compilers js:babel-core/register --recursive"'
json -f package.json -I -e 'this.babel = {}'
json -f package.json -I -e 'this.babel.presets = ["es2015", "react"]'
json -f package.json -I -e 'this.main = "./lib/index"'
json -f package.json -I -e 'this.esnext = "./src/index"'
I can run it here from the terminal like this:
bash -c "$(curl -fsSL https://gist.githubusercontent.com/reggi/8035dcbdf0fb73b8c8703a4d244f15cf/raw/767ec8c2fb54b554ce122cc85953da5b277dbaf4/babel-ready.sh)"
I'm curious if there's an easily way to create an alias from the terminal. Something simple like:
add-alias babel-ready -- bash -c "$(curl -fsSL https://gist.githubusercontent.com/reggi/8035dcbdf0fb73b8c8703a4d244f15cf/raw/767ec8c2fb54b554ce122cc85953da5b277dbaf4/babel-ready.sh)"

Answer 1

A rough attempt (not flow-control aware, not idempotent, not able to recognize and remove old versions of the same alias) might look something like this:
# non-POSIX-compliant function keyword used to allow dash in function name
function add-alias() {
# declare locals explicitly to prevent scope leakage
local content_line cmd
(( $# == 1 )) && [[ $1 ]] || {
echo "Usage: add_alias name" >&2
return 1
}
IFS= read -r content_line
# reject inputs containing newlines
content_line=${content_line%$'\n'}
if [[ $content_line = *$'\n'* ]]; then
echo "ERROR: Only one line may be provided" >&2
return 1
fi
# generate a command
printf -v cmd "alias %q=%q" "$1" "$content_line"
# eval it in the local shell, and add to the rc if that succeeds
eval "$cmd" && printf '%s\n' "$cmd" >>"$HOME/.bashrc"
}
...used as:
add-alias babel-ready <<'EOF'
bash -c "$(curl -fsSL https://gist.githubusercontent.com/reggi/8035dcbdf0fb73b8c8703a4d244f15cf/raw/767ec8c2fb54b554ce122cc85953da5b277dbaf4/babel-ready.sh)"
EOF
Note the use of <<'EOF' -- quoting the heredoc is important, as this prevents expansions from being run when the alias is being defined (as opposed to when it's run). This is why usage is passing code on stdin rather than on the command line, which would make it the user's responsibility to quote command line arguments appropriately.