* refactor(tokenizer): use class for keywork tokens
* refactor(tokenizer): re-use constacts in types
* refactor(tokenizer): binop token type
* feat(tokenizer): use beforeAndStartExpr for shortcut
* fix(tokenizer): typo in keywordTokenType
* refactor(tokenizer): don't use spread operator
* refactor(tokenizer): constant for isLoop, isAssign, prefix, postfix
* fix(tokenizer): remove constant beforeAndStartExpr
* style(tokenizer): space after comma
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