fix: default mock interceptor to GET

[JustinBeckwith]

I am in the process of migrating an open source project from node-fetch to undici. I am making heavy use of nock, which doesn't exactly work here :) One of the things I noticed is that nock tends to default to assuming GET on interceptors, and I think it's a fairly accepted norm in terms of request libraries. This change makes method optional on the MockClient.intercept method, and defaults it to a GET in that case.

const mock = new MockAgent();
const scope = mock
      .get('http://fake.local')
      .intercept({path: '/'}) // look ma, no {method: 'GET'}!
      .reply(200);

Not sure if this is a desirable API change or not, but thought it would aid in making the transition from nock to here a tad easier.

[mcollina]

lgtm

[mcollina]

Can you add a test for the type? We use tsd!

[mcollina]

could you also update the docs?

[JustinBeckwith]

Updated docs and added a type test! Sorry for the delay.

[codecov-commenter]

Codecov Report

Merging #1285 (f57d4f3) into main (392213e) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1285      +/-   ##
==========================================
+ Coverage   94.11%   94.16%   +0.04%     
==========================================
  Files          44       45       +1     
  Lines        4098     4112      +14     
==========================================
+ Hits         3857     3872      +15     
+ Misses        241      240       -1     

Impacted Files	Coverage Δ
lib/mock/mock-interceptor.js	100.00% <100.00%> (ø)
lib/fetch/response.js	84.86% <0.00%> (-7.56%)	⬇️
lib/pool-base.js	96.77% <0.00%> (-0.98%)	⬇️
lib/fetch/body.js	98.33% <0.00%> (-0.84%)	⬇️
lib/client.js	97.93% <0.00%> (-0.11%)	⬇️
lib/agent.js	100.00% <0.00%> (ø)
lib/proxy-agent.js	100.00% <0.00%> (ø)
lib/fetch/headers.js	100.00% <0.00%> (ø)
lib/fetch/constants.js	100.00% <0.00%> (ø)
lib/mock/mock-agent.js	100.00% <0.00%> (ø)
... and 7 more

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[mcollina]

lgtm