fix: restore previous explicit document type parameter handling (fixes #246)

[angeloashmore]

Types of changes

• Chore (a non-breaking change which is related to package maintenance)
• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

This fixes a regression introduced in #238 that prevented explicit doucment type parameters to be accepted. This includes cases that appear like the following:

import * as prismic from "@prismicio/client";
import * as prismicT from "@prismicio/types";

type PageDocument = prismicT.PrismicDocument<
  { foo: prismicT.KeyTextField },
  "page"
>;

const client = prismic.createClient("qwerty");

const home = await client.getByUID<PageDocument>("page", "home");
//    ^ Typed as `PageDocument`

Before this PR, home would be typed as prismicT.PrismicDocument when it should be PageDocument.

Fixes #246

Checklist:

• My change requires an update to the official documentation.
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #247 (909fac5) into master (00572af) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #247   +/-   ##
=======================================
  Coverage   99.46%   99.46%           
=======================================
  Files          23       23           
  Lines         377      377           
  Branches       76       76           
=======================================
  Hits          375      375           
  Partials        2        2           

Impacted Files	Coverage Δ
src/client.ts	99.10% <100.00%> (ø)

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[github-actions]

size-limit report 📦

Path	Size
dist/index.js	4.1 KB (0%)
dist/index.cjs	7 KB (0%)