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

✅ apply-template-literal;
✅ apply-ternary;
✅ convert-array-from-to-spread;
✅ convert-const-to-var;
✅ convert-if-to-logical;
✅ [convert-return-to-sequence-expression][#convert-return-to-sequence-expression];
✅ convert-strict-equal-to-equal;
✅ expand-bindings;
✅ extract-body;
✅ join-continued-strings;
✅ inline;
✅ mangle-names;
✅ merge-loops;
✅ merge-variables;
✅ remove-return-undefined;
✅ remove-var-undefined;
✅ shorten-names;j
✅ simplify-floor;
✅ types;

Config

{
    "rules": {
        "minify/apply-ternary": "on",
        "minify/apply-template-literal": "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/convert-return-to-sequence-expression": "on",
        "minify/extract-body": "on",
        "minify/expand-bindings": "on",
        "minify/mangle-names": ["on", {
            "mangleClassNames": true
        }],
        "minify/merge-variables": "on",
        "minify/merge-loops": "on",
        "minify/remove-var-undefined": "on",
        "minify/remove-return-undefined": "on",
        "minify/simplify-floor": "on",
        "minify/shorten-names": "on",
        "minify/join-continued-strings": "on",
        "minify/inline": "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();

apply-template-literal

Not only short, but also fast:

// 34.795ms
for (let i = 0; i < 1_000_000; i++)
    String(i);

// 28.302ms
for (let i = 0; i < 1_000_000; i++)
    i.toString();

// 24.818ms
for (let i = 0; i < 1_000_000; i++)
    `${i}`;

❌ Example of incorrect code

x.toString();
String(x);

✅ Example of correct code

String(x);

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-return-to-sequence-expression

Check out in 🐊Putout Editor.

❌ Example of incorrect code

() => {
    d();
    return 1;
};

✅ Example of correct code

() => {
    d();
    return 1;
};

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;

merge-loops

Check out in 🐊Putout Editor.

❌ Example of incorrect code

for (const aa of a)
    d.push(aa);

for (const bb of b)
    d.push(bb);

✅ Example of correct code

for (const aa of [...a, ...b])
    d.push(aa);

simplify-floor

Not only shorter, but faster:

// 5.027ms
for (let i = 0; i < 1_000_000; i++)
    Math.floor(i + 0.5);

// 3.493ms
for (let i = 0; i < 1_000_000; i++)
    ~~(i + 0.5);

❌ Example of incorrect code

Math.floor(x);

✅ Example of correct code

~~x;

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;

join-continued-strings

Join continued strings to one line. Check out in 🐊Putout Editor.

❌ Example of incorrect code

console.log(`\
  1\
  2\
  3`, '\
  a\
  b\
  c');

✅ Example of correct code

console.log(`  1  2  3`, '  a  b  c');

inline

Check out in 🐊Putout Editor.

❌ Example of incorrect code

let x = 1;
--x;

if (!x)
    console.log('hello');

✅ Example of correct code

let x = 1;

if (!--x)
    console.log('hello');

License

MIT