Convert project to TypeScript

As a binary-heavy module with a lot of complicated parameters, this is a valuable module to add typescript to. In the past, we’ve failed to add a proper declaration file, so rather than take that half-measure, we should actually convert the module to TypeScript.

In case we add a bounty, we need well defined acceptance criteria. Those would be:

• The changes should obviously not change module behavior at all.
• All method parameters and return types should be typed.
• Should introduce an npm build script which builds the typescript file into an output file.
• the package.json main field should point to the built output.
• Anyone re-running build should be able to deterministically produce the same output.
• The typedef file should be generated programmatically from the input script.
• Migrating to yarn in the process is acceptable but not required.

[danfinlay]

Okay, a quick review of #73, it seems to have merely moved the .js to .ts file. That’s very funny, because JS is valid TS, but it isn’t what is intended by this issue, I’ll be clarifying the master post to clarify.

[gitcoinbot]

💰 A crowdfund contribution worth 5.00000 DAI (5.0 USD @ $1.0/DAI) has been attached to this funded issue from @bakkdoor.💰

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