feat: add declaration file to prevent type error

[ChrisCho-H]

I know it's pure js project, but a lot of typescript dev utilizes this module to optimize UTXO selection for bitcoin transaction. Just adding simple declaration file will make this library much more usable for typescript dev!

[KorbisInc]

Yeah this would be appreciated to have merged.

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If it's a worry to keep types maintained, JSDoc can be used to both document and derive types, while remaining pure JS. After hearing the Svelte people taking this approach I looked into it and makes a lot of sense from a lib development perspective.

https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html

[ChrisCho-H]

Thx, I updated following your suggestion.

[Overtorment]

[junderw]

@Overtorment I gave you write permissions. Also, what is your npm user name?

[junderw]

Defer to @Overtorment

[KorbisInc]

Thank you everyone for getting this in ❤️

[junderw]

... shouldn't this d.ts file be referenced in package.json?

[KorbisInc]

Yes, in the types property, as you probably read.

[ChrisCho-H]

add types in package.json in 683e6df

[junderw]

@Overtorment merge when ready.

[Overtorment]

@junderw i dont have npm account. dont trust them

[ChrisCho-H]

I made PR #82 to calculate fee more precisely(varying on type of input/output), which also adds script field type for UTXO and Target(coinselect accepts script as input and output. I should have added in this PR actually), and isTaproot field type for UTXO to calculate p2tr input bytes.

[griga]

So this type declarations won't be published to npm ?

[ChrisCho-H]

@griga If u need typed one in npm u can use my forked version. It also supports segwit fee calculation.