JSONFile.jsm, a new module to help with serializing JSON to disk

[Luke Chang]

Hey folks,

This is a notice about a module, JSONFile.jsm, just landed in
"toolkit/modules".

Matt, Steve and I have been working on Form Autofill [1]. While
implementing, we intend to leverage modules of Password Manager because of
their similar behaviors. LoginStore.jsm [2] is one of those modules.

The above-mentioned JSONFile.jsm is basically separated from
LoginStore.jsm, which is in charge of storing login-related data in a
".json" file. In order to increase the reusability of such JSON-formatted
storage that we're going to use in Form Autofill as well, we refactored
LoginStore.jsm. More specifically, those IO-specific APIs were generalized
and moved to JSONFile.jsm. Therefore, LoginStore.jsm will focus on
schema-related operations such as data migrations.

To sum up, you can now utilize JSONFile.jsm to store simple data in a
single file as long as the data can be serialized to JSON format. More
details can be found in bug 1304322 [3].

Thanks,
Luke

[1] https://wiki.mozilla.org/Firefox/Features/Form_Autofill
[2]
https://dxr.mozilla.org/mozilla-central/source/toolkit/components/passwordmgr/LoginStore.jsm
[3] https://bugzilla.mozilla.org/show_bug.cgi?id=1304322
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