Package Exports

@putout/plugin-minify
@putout/plugin-minify/lib/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@putout/plugin-minify) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

@putout/plugin-minify

🐊Putout plugin adds support of minifiers used in @putout/minify and minify.

Install

npm i @putout/plugin-putout -D

Rules

{
    "rules": {
        "minify/apply-ternary": "on",
        "minify/convert-var-to-const": "on",
        "minify/convert-if-to-logical": "on",
        "minify/convert-strict-equal-to-equal": "on",
        "minify/convert-array-from-to-spread": "on",
        "minify/extract-body": "on",
        "minify/expand-bindings": "on",
        "minify/mangle-names": ["on", {
            "mangleClassNames": true
        }],
        "minify/merge-variables": "on",
        "minify/remove-var-undefined": "on",
        "minify/remove-return-undefined": "on",
        "minify/shorten-names": "on",
        "minify/types": "on"
    }
}

apply-ternary

Check out in 🐊Putout Editor.

❌ Example of incorrect code

if (a)
    b();
else
    c();

✅ Example of correct code

a ? b() : c();

convert-if-to-logical

Check out in 🐊Putout Editor.

❌ Example of incorrect code

if (a)
    console.log('hello');

if (b) {
    console.log('hello');
    console.log('world');
}

if (a) {
    console.log(1);
    console.log(2);
} else {
    console.log(3);
    console.log(4);
}

✅ Example of correct code

a && console.log('hello');

b && (console.log('hello'), console.log('world'));

a ? (console.log(1), console.log(2)) : (console.log(3), console.log(4));

convert-const-to-var

❌ Example of incorrect code

const a = 5;

✅ Example of correct code

var a = 5;

convert-strict-equal-to-equal

Check out in 🐊Putout Editor.

❌ Example of incorrect code

a === b;

✅ Example of correct code

a === b;

convert-array-from-to-spread

❌ Example of incorrect code

Array
    .from(a)
    .map((x, i) => `${i}: ${x}`);

✅ Example of correct code

[...a].map((x, i) => `${i}: ${x}`);

extract-body

Check out in 🐊Putout Editor.

❌ Example of incorrect code

if (x) {
    return;
}

const hello = () => {
    return 'world';
};

✅ Example of correct code

if (x)
    return;

const hello = () => 'world';

expand-bindings

Check out in 🐊Putout Editor.

❌ Example of incorrect code

const y = 'abc';
const x = y;
const fn = require(x);

const a = 5;
const b = a;
const c = b;

fn(c);

✅ Example of correct code

require('abc')(5);

remove-var-undefined

Checkout in 🐊Putout Editor.

❌ Example of incorrect code

var a = undefined;

✅ Example of correct code

var a;

remove-return-undefined

❌ Example of incorrect code

const fn = () => {
    if (a)
        return undefined;
    
    return undefined;
};

✅ Example of correct code

const fn = () => {
    if (a)
        return;
};

mangle-names

Check out in 🐊Putout Editor.

❌ Example of incorrect code

function generate() {
    const hello = 'hi';
    return hello;
}

✅ Example of correct code

function generate() {
    const a = 'hi';
    return a;
}

When you want to preserve class names use

{
    "rules": {
        "minify/mangle-names": ["on", {
            "mangleClassNames": false
        }]
    }
}

In this case you will see:

❌ Example of incorrect code

class Hello {
    world() {
        const hello = 'hello';
        return hello;
    }
}

✅ Example of correct code

class Hello {
    world() {
        const a = 'hello';
        return a;
    }
}

merge-variables

Check out in 🐊Putout Editor.

❌ Example of incorrect code

var a, b;

✅ Example of correct code

var a;
var b;

shorten-names

Feats good to @putout/plugin-declare. Check out in 🐊Putout Editor.

❌ Example of incorrect code

const a = (b) => {
    Object.keys(b);
};

const b = (keys) => {
    Object.keys(keys);
};

Object.freeze(a);
Object.defineProperty(b);

✅ Example of correct code

const a = (b) => {
    keys(b);
};

const b = (keys) => {
    Object.keys(keys);
};

freeze(a);
defineProperty(b);

types

Check out in 🐊Putout Editor.

❌ Example of incorrect code

const a = undefined;
const b = true;
const c = false;

✅ Example of correct code

const a = void 0;
const b = !0;
const c = !1;

License

MIT