reduce the size of the compiled output

src/index.mjs

@@ -10,13 +10,13 @@ export default function(url, options) {
  request.open(options.method || 'get', url, true);
 
  request.onload = () => {
- const head = { all: [], keys: [], raw: {} };
+ const all = [], keys = [], raw = {};
  request.getAllResponseHeaders().replace(regex, (m, key, value) => {
- head.all.push([key, value]);
- head.keys.push(key = key.toLowerCase());
- head.raw[key] = head.raw[key] ? `${head.raw[key]},${value}` : value;
+ all.push([key, value]);
+ keys.push(key = key.toLowerCase());
+ raw[key] = raw[key] ? `${raw[key]},${value}` : value;
  });
- resolve(response(request, head));
+ resolve(response(request, all, keys, raw));
  };
 
  request.onerror = reject;

src/lib/response.mjs

@@ -1,4 +1,4 @@
-export default function response (request, headers) {
+export default function response (request, all, keys, raw) {
  return {
  ok: (request.status/100|0) == 2, // 200-299
  statusText: request.statusText,
@@ -7,12 +7,12 @@ export default function response (request, headers) {
  text: () => Promise.resolve(request.responseText),
  json: () => Promise.resolve(request.responseText).then(JSON.parse),
  blob: () => Promise.resolve(new Blob([request.response])),
- clone: () => response(request, headers),
+ clone: () => response(request, all, keys, raw),
  headers: {
- keys: () => headers.keys,
- entries: () => headers.all,
- get: n => headers.raw[n.toLowerCase()],
- has: n => n.toLowerCase() in headers.raw
+ keys: () => keys,
+ entries: () => all,
+ get: n => raw[n.toLowerCase()],
+ has: n => n.toLowerCase() in raw
  }
  };
 }

test/lib/response.js

@@ -1,7 +1,12 @@
 import response from '../../src/lib/response.mjs';
 
 describe('response()', () => {
- it('returns text()', () => response({ responseText: 'A passing test.' })
+ const raw = { 'x-foo': 'foo', 'x-bar': 'bar' };
+ const keys = Object.keys(raw);
+ const all = Object.entries(raw);
+ const resp = response({}, all, keys, raw);
+
+ it('returns text()', () => response({ responseText: 'A passing test.' }, [], [], {})
  .text()
  .then((text) => expect(text).toBe('A passing test.'))
  );
@@ -12,19 +17,16 @@ describe('response()', () => {
  );
 
  it('returns headers', () => {
- const all = [['x-foo', 'bar'], ['x-baz', 'boo']];
- const result = response({}, { all }).headers.entries();
- expect(result).toEqual(all);
+ expect(resp.headers.entries()).toEqual(all);
  });
 
  it('returns header keys', () => {
- const result = response({}, { keys: ['x-foo'] }).headers.keys();
- expect(result).toEqual(['x-foo']);
+ expect(resp.headers.keys()).toEqual(['x-foo', 'x-bar']);
  });
 
  it('returns headers has', () => {
- const raw = { 'x-foo': 'bar', 'x-baz': 'boo' };
- const test = response({}, { raw }).headers;
- expect(test.has('x-foo')).toBe(true);
+ expect(resp.headers.has('x-foo')).toBe(true);
+ expect(resp.headers.has('x-bar')).toBe(true);
+ expect(resp.headers.has('x-baz')).toBe(false);
  });
 });