# TrimKit

TrimKit is a set of DOM and API abstractions for the purpose of better Javascript minification. For
example:

```
if (a === undefined) { alert('Oops'); }
```

minifies down to:

```
if(a===void 0){alert('Oops')}
```

If we compare against undefined more than 3 times, we can save bytes by doing this:

```
function isUndefined(a) { return a === void 0; }

if (isUndefined(a)) { alert('Oops'); }
```

which minifies down to:

```
function b(a){return a===void 0}

if (b(a)){alert('Oops');}
```

With enough uses of common APIs, you can win back some bytes.

NOTE: TrimKit will help you obsess about Javascript file sizes but that does not always translate to
smaller files after you apply compression. Because files using have more entropy, small,
pre-compression gains can result in post-compression losses. YMMV.

# Abstractions

- `undefined`
- `requestAnimationFrame`
- `Array.isArray`
- `Array.from`
- `Object.keys`
- `document`
- `typeof obj === 'function'`
- `typeof obj === 'string'`
- `typeof obj === 'number'`
- `null`
- `obj === undefined`
- `obj === null`
- `fn.apply(context, params)`