Add beforeParse and reviver options

[gakada]

This adds options parameter with

• reviver from parse-json / JSON.parse
• arbitrary functions before and after for initial string and final value
• prefix for arbitrary prefixes (like the XSSI prevention prefix or a var= prefix).

[sindresorhus]

I agree with the reviver option, but the other ones I'm sceptical to.

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prefix for arbitrary prefixes (like the XSSI prevention prefix or a var= prefix).

This module loads local JSON files. This doesn't apply here.

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arbitrary functions before and after for initial string and final value

after is moot as you can just do it yourself after calling this module. What's the use-case for before?

[gakada]

Yes, I added after and before just for generality, after can be done on the result, while before generalizes prefix (so, e.g., for #7 it would be {before: stripJsonComments}). Specifically I want prefix (or before) as it so happens that my local JSON files (those are logged HTTP responses) have a prefix. If it is outside of the scope, I can re-push just for reviver parameter.

[sindresorhus]

Alright. I'm willing to add the before option so you can handle the prefix stripping yourself, but the prefix option is out of scope.

[sindresorhus]

I would call it beforeParse instead of before to be clear.

[gakada]

Thanks. I updated to options with just beforeParse and reviver.