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babel-multi-env

babel CLI replacement with multiple node version support by babel-preset-env and babel-plugin-transform-runtime. Useful for node.js libraries/modules

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Usage

Transforms:

import fs from "fs";
import promisify from "util.promisify";
export async function demoBumpVersion(nextVersion = "1.0.0") {
 const content = await promisify(fs.readFile)("package.json", "utf8");
 const json = JSON.parse(content);
 json.version = nextVersion;
 await promisify(fs.writeFile)(
 "package.json",
 JSON.stringify(json, null, 4),
 "utf8"
 );
 return () => console.log(`Successfully bumped version to: ${nextVersion}`);
}

with the command:

cd example
yarn babel-multi-env --multi-versions 8.0.0 6.0.0 4.0.0 0.12.0 0.10.0 --given src/index.js --out-dir lib

and output these files:

example/lib/index.js
example/lib/index__0.10.0__.js
example/lib/index__0.12.0__.js
example/lib/index__4.0.0__.js
example/lib/index__6.0.0__.js
example/lib/index__8.0.0__.js

where

var gte = require("semver").gte;
var version = process.version;
if (gte(version, "8.0.0")) {
 module.exports = require("./index__8.0.0__.js");
} else if (gte(version, "6.0.0")) {
 module.exports = require("./index__6.0.0__.js");
} else if (gte(version, "4.0.0")) {
 module.exports = require("./index__4.0.0__.js");
} else if (gte(version, "0.12.0")) {
 module.exports = require("./index__0.12.0__.js");
} else {
 module.exports = require("./index__0.10.0__.js");
}
"use strict";
var _interopRequireDefault = require("babel-runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
 value: true
});
exports.demoBumpVersion = demoBumpVersion;
var _stringify = _interopRequireDefault(
 require("babel-runtime/core-js/json/stringify")
);
var _fs = _interopRequireDefault(require("fs"));
var _util = _interopRequireDefault(require("util.promisify"));
async function demoBumpVersion(nextVersion = "1.0.0") {
 const content = await (0, _util.default)(_fs.default.readFile)(
 "package.json",
 "utf8"
 );
 const json = JSON.parse(content);
 json.version = nextVersion;
 await (0, _util.default)(_fs.default.writeFile)(
 "package.json",
 (0, _stringify.default)(json, null, 4),
 "utf8"
 );
 return () => console.log(`Successfully bumped version to: ${nextVersion}`);
}
"use strict";
var _interopRequireDefault = require("babel-runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
 value: true
});
exports.demoBumpVersion = void 0;
var _stringify = _interopRequireDefault(
 require("babel-runtime/core-js/json/stringify")
);
var _asyncToGenerator2 = _interopRequireDefault(
 require("babel-runtime/helpers/asyncToGenerator")
);
var _fs = _interopRequireDefault(require("fs"));
var _util = _interopRequireDefault(require("util.promisify"));
let demoBumpVersion = (() => {
 var _ref = (0, _asyncToGenerator2.default)(function*(nextVersion = "1.0.0") {
 const content = yield (0, _util.default)(_fs.default.readFile)(
 "package.json",
 "utf8"
 );
 const json = JSON.parse(content);
 json.version = nextVersion;
 yield (0,
 _util.default)(_fs.default.writeFile)("package.json", (0, _stringify.default)(json, null, 4), "utf8");
 return () => console.log(`Successfully bumped version to: ${nextVersion}`);
 });
 return function demoBumpVersion() {
 return _ref.apply(this, arguments);
 };
})();
exports.demoBumpVersion = demoBumpVersion;

......and you get the idea.

More sample code for node@4, node@0.12 and node@0.10 
/* lib/index__4.0.0__.js */
"use strict";
var _interopRequireDefault = require("babel-runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
 value: true
});
exports.demoBumpVersion = void 0;
var _regenerator = _interopRequireDefault(require("babel-runtime/regenerator"));
var _stringify = _interopRequireDefault(require("babel-runtime/core-js/json/stringify"));
var _asyncToGenerator2 = _interopRequireDefault(require("babel-runtime/helpers/asyncToGenerator"));
var _fs = _interopRequireDefault(require("fs"));
var _util = _interopRequireDefault(require("util.promisify"));
var demoBumpVersion = function () {
 var _ref = (0, _asyncToGenerator2.default)(
 /*#__PURE__*/
 _regenerator.default.mark(function _callee() {
 var nextVersion,
 content,
 json,
 _args = arguments;
 return _regenerator.default.wrap(function _callee$(_context) {
 while (1) {
 switch (_context.prev = _context.next) {
 case 0:
 nextVersion = _args.length > 0 && _args[0] !== undefined ? _args[0] : "1.0.0";
 _context.next = 3;
 return (0, _util.default)(_fs.default.readFile)("package.json", "utf8");
 case 3:
 content = _context.sent;
 json = JSON.parse(content);
 json.version = nextVersion;
 _context.next = 8;
 return (0, _util.default)(_fs.default.writeFile)("package.json", (0, _stringify.default)(json, null, 4), "utf8");
 case 8:
 return _context.abrupt("return", function () {
 return console.log(`Successfully bumped version to: ${nextVersion}`);
 });
 case 9:
 case "end":
 return _context.stop();
 }
 }
 }, _callee, this);
 }));
 return function demoBumpVersion() {
 return _ref.apply(this, arguments);
 };
}();
exports.demoBumpVersion = demoBumpVersion;
/* lib/index__0.12.0__.js */
"use strict";
var _interopRequireDefault = require("babel-runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
 value: true
});
exports.demoBumpVersion = void 0;
var _regenerator = _interopRequireDefault(require("babel-runtime/regenerator"));
var _stringify = _interopRequireDefault(require("babel-runtime/core-js/json/stringify"));
var _asyncToGenerator2 = _interopRequireDefault(require("babel-runtime/helpers/asyncToGenerator"));
var _fs = _interopRequireDefault(require("fs"));
var _util = _interopRequireDefault(require("util.promisify"));
var demoBumpVersion = function () {
 var _ref = (0, _asyncToGenerator2.default)(
 /*#__PURE__*/
 _regenerator.default.mark(function _callee() {
 var nextVersion,
 content,
 json,
 _args = arguments;
 return _regenerator.default.wrap(function _callee$(_context) {
 while (1) {
 switch (_context.prev = _context.next) {
 case 0:
 nextVersion = _args.length > 0 && _args[0] !== undefined ? _args[0] : "1.0.0";
 _context.next = 3;
 return (0, _util.default)(_fs.default.readFile)("package.json", "utf8");
 case 3:
 content = _context.sent;
 json = JSON.parse(content);
 json.version = nextVersion;
 _context.next = 8;
 return (0, _util.default)(_fs.default.writeFile)("package.json", (0, _stringify.default)(json, null, 4), "utf8");
 case 8:
 return _context.abrupt("return", function () {
 return console.log("Successfully bumped version to: ".concat(nextVersion));
 });
 case 9:
 case "end":
 return _context.stop();
 }
 }
 }, _callee, this);
 }));
 return function demoBumpVersion() {
 return _ref.apply(this, arguments);
 };
}();
exports.demoBumpVersion = demoBumpVersion;
/* lib/index__0.10.0__.js */
"use strict";
var _interopRequireDefault = require("babel-runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
 value: true
});
exports.demoBumpVersion = void 0;
var _regenerator = _interopRequireDefault(require("babel-runtime/regenerator"));
var _stringify = _interopRequireDefault(require("babel-runtime/core-js/json/stringify"));
var _asyncToGenerator2 = _interopRequireDefault(require("babel-runtime/helpers/asyncToGenerator"));
var _fs = _interopRequireDefault(require("fs"));
var _util = _interopRequireDefault(require("util.promisify"));
var demoBumpVersion = function () {
 var _ref = (0, _asyncToGenerator2.default)(
 /*#__PURE__*/
 _regenerator.default.mark(function _callee() {
 var nextVersion,
 content,
 json,
 _args = arguments;
 return _regenerator.default.wrap(function _callee$(_context) {
 while (1) {
 switch (_context.prev = _context.next) {
 case 0:
 nextVersion = _args.length > 0 && _args[0] !== undefined ? _args[0] : "1.0.0";
 _context.next = 3;
 return (0, _util.default)(_fs.default.readFile)("package.json", "utf8");
 case 3:
 content = _context.sent;
 json = JSON.parse(content);
 json.version = nextVersion;
 _context.next = 8;
 return (0, _util.default)(_fs.default.writeFile)("package.json", (0, _stringify.default)(json, null, 4), "utf8");
 case 8:
 return _context.abrupt("return", function () {
 return console.log("Successfully bumped version to: ".concat(nextVersion));
 });
 case 9:
 case "end":
 return _context.stop();
 }
 }
 }, _callee, this);
 }));
 return function demoBumpVersion() {
 return _ref.apply(this, arguments);
 };
}();
exports.demoBumpVersion = demoBumpVersion;

Installation

npm i --save-dev babel-multi-env
# or
yarn add --dev babel-multi-env

Note on the peerDependencies

There are currently five peerDependencies listed under the package.json for babel-multi-env. Be sure not to screw up their versions sicne babel@^7 are currently in beta and can be found under the next dist-tags on npm.

dependencies

Your should add these to your dependencies:

  • "babel-runtime": "^7.0.0-beta.3"
  • "semver": "^5.4.1"

since they'll be used in the runtime.

devDependencies

And, these three for the code generation only:

  • "babel-core": "^7.0.0-beta.3",
  • "babel-plugin-transform-runtime": "^7.0.0-beta.3",
  • "babel-preset-env": "^7.0.0-beta.3",

Options

screen shot 2017年11月01日 at 10 55 57 am 

[babel-multi-env]
 --multi-versions list of supported semver versions. Example: 8.0.0 6.0.0
 4.0.0 [array] [required]
 --given source glob patterns [array] [required]
 --out-dir compile into an output directory [string] [required]
[babel-preset-env]
 --use-built-ins apply babel-preset-env for polyfills with "useBuiltIns":
 "usage" (via babel-polyfill) [string] [choices: "usage"]
[babel-plugin-transform-runtime]
 --helpers Enables inlined Babel helpers (classCallCheck, extends, etc.)
 are replaced with calls to moduleName [boolean] [default: true]
 --polyfill Enables new built-ins (Promise, Set, Map, etc.) are transformed
 to use a non-global polluting polyfill[boolean] [default: true]
 --regenerator Enables generator functions are transformed to use a
 regenerator runtime that does not pollute the global scope
 [boolean] [default: true]
 --module-name sets the name/path of the module used when importing helpers
 [string] [default: babel-runtime]
[babel-core]
 --presets list of preset names [array]
 --plugins list of plugins names [array]
Options:
 --help, -h Show help [boolean]
 --version, -v Show version number [boolean]

Examples

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`babel` CLI replacement with multiple node version support by babel-preset-env

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