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@babel/plugin-transform-arrow-functions
Advanced tools
Package description
The @babel/plugin-transform-arrow-functions package is a plugin for Babel, a JavaScript compiler, that transforms arrow function syntax into function expressions. This transformation is particularly useful for ensuring compatibility with environments that do not support ES6 arrow functions.
Transform arrow functions to function expressions
Converts ES6 arrow functions into equivalent ES5 function expressions. For example, the arrow function `() => 5` gets transformed into a function expression `function() { return 5; }`.
"use strict";\n\nvar a = function a() {\n return 5;\n};"
Similar to @babel/plugin-transform-arrow-functions, this package transforms ES6 function syntax, including arrow functions, to ES5. However, it's more comprehensive, covering a wider range of function transformations beyond just arrow functions.
This package is a Babel preset for all ES2015 plugins, including the transformation of arrow functions. It's broader in scope, offering transformations for a full range of ES2015 features, not just arrow functions.
Readme
Compile ES2015 arrow functions to ES5
In
var a = () => {};
var a = (b) => b;
const double = [1,2,3].map((num) => num * 2);
console.log(double); // [2,4,6]
var bob = {
_name: "Bob",
_friends: ["Sally", "Tom"],
printFriends() {
this._friends.forEach(f =>
console.log(this._name + " knows " + f));
}
};
console.log(bob.printFriends());
Out
var a = function () {};
var a = function (b) {
return b;
};
const double = [1, 2, 3].map(function (num) {
return num * 2;
});
console.log(double); // [2,4,6]
var bob = {
_name: "Bob",
_friends: ["Sally", "Tom"],
printFriends() {
var _this = this;
this._friends.forEach(function (f) {
return console.log(_this._name + " knows " + f);
});
}
};
console.log(bob.printFriends());
npm install --save-dev @babel/plugin-transform-arrow-functions
.babelrc
(Recommended).babelrc
Without options:
{
"plugins": ["@babel/plugin-transform-arrow-functions"]
}
With options:
{
"plugins": [
["@babel/plugin-transform-arrow-functions", { "spec": true }]
]
}
babel --plugins @babel/plugin-transform-arrow-functions script.js
require("@babel/core").transform("code", {
plugins: ["@babel/plugin-transform-arrow-functions"]
});
spec
boolean
, defaults to false
.
Using spec mode with the above example produces:
var _this = this;
var a = function a() {
babelHelpers.newArrowCheck(this, _this);
}.bind(this);
var a = function a(b) {
babelHelpers.newArrowCheck(this, _this);
return b;
}.bind(this);
const double = [1, 2, 3].map(function (num) {
babelHelpers.newArrowCheck(this, _this);
return num * 2;
}.bind(this));
console.log(double); // [2,4,6]
var bob = {
_name: "Bob",
_friends: ["Sally", "Tom"],
printFriends() {
var _this2 = this;
this._friends.forEach(function (f) {
babelHelpers.newArrowCheck(this, _this2);
return console.log(this._name + " knows " + f);
}.bind(this));
}
};
console.log(bob.printFriends());
This option enables the following:
Wrap the generated function in .bind(this)
and keeps uses of this
inside
the function as-is, instead of using a renamed this
.
Add a runtime check to ensure the functions are not instantiated.
Add names to arrow functions.
FAQs
Unknown package
We found that @babel/plugin-transform-arrow-functions demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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