* chore: migrate `src/pipetransport` to typescript
Hit one bump in the fact that I want to share an interface across files.
TypeScript only lets you import/export these if you're using ESM, not
CommonJS. So the two options are:
- Migrate to ESM on a per file basis as we do this migration. This won't
affect the output as we output as CommonJS.
- Create a global `types.d.ts` file that we'll use and then migrate to
ESM after.
Right now I've gone for the second option in order to not introduce more
changes in one go. But if we end up finding we have lots of
interfaces/types/etc that we want modules to expose, we might decide
slowly introducing ESM might be a better way forwards.
* Update src/types.d.ts
Co-Authored-By: Mathias Bynens <mathias@qiwi.be>
This PR migrates the helper module to TypeScript. It's a bit of a bigger
change than others because I decided to move away from the helper class
with static methods and move towards a simpler set up where the module
is a bunch of functions. I still expose them under the `helper`
namespace to avoid this being a big change - we can update that later
when we migrate to ESM.
We do have to do some unfortunate wrangling of the promisify function.
Ideally I'd like to rely on the Node one (and the type defs) but that
doesn't work in Browserify land. I've stuck with the promisify in
`helper.ts` but pulled it into its own module to enable me to leave a
comment clarifying why we use it and the context. We can solve this with
a better web bundling story but that work is lower priority right now
than getting the `src/` directory into TypeScript.
