isMod method

[blond]

Similar to entity.type === 'blockMod' || entity.type === 'elemMod'.

In some cases we need to know whether this entity is an modifier or not modifier.

Example:

const text = new BemEntityName({ block: 'button', elem: 'text' });
const focuedButton = new BemEntityName({ block: 'button', mod: 'focused' });

text.isMod() // false
focuedButton.isMod() // true

I don't want to check modifier by mod field. This allows access to mod.name & mod.val fields safe:

const text = new BemEntityName({ block: 'button', elem: 'text' });
const focuedButton = new BemEntityName({ block: 'button', mod: 'focused' });

text.mod.name // undefined
text.mod.val // undefined

focuedButton.mod.name // focused
focuedButton.mod.val // true

[blond]

If not add isMod method we should change mod field for non-modifiers.

Example:

const text = new BemEntityName({ block: 'button', elem: 'text' });
const focuedButton = new BemEntityName({ block: 'button', mod: 'focused' });

text.mod // undefined

focuedButton.mod.name // focused
focuedButton.mod.val // true

Boolean(text.mod); // false
Boolean(focuedButton.mod); // true

[qfox]

Guess changing is fine here since we normalizing data.