packages/babel-cli/src/babel-external-helpers.js
// @flow
import commander from "commander";
import { buildExternalHelpers } from "@babel/core";
function collect(
value: string | any,
previousValue: Array<string>,
): Array<string> {
// If the user passed the option with no value, like "babel-external-helpers --whitelist", do nothing.
if (typeof value !== "string") return previousValue;
const values = value.split(",");
return previousValue ? previousValue.concat(values) : values;
}
commander.option(
"-l, --whitelist [whitelist]",
"Whitelist of helpers to ONLY include",
collect,
);
commander.option(
"-t, --output-type [type]",
"Type of output (global|umd|var)",
"global",
);
commander.usage("[options]");
commander.parse(process.argv);
console.log(buildExternalHelpers(commander.whitelist, commander.outputType));