fix: use local now, resolves #10

src/__tests__/now.js

@@ -2,6 +2,8 @@ const execa = require('execa')
 const mockedEnv = require('mocked-env')
 const now = require('../now')
 
+const {NOW_BIN} = now
+
 jest.mock('execa')
 execa.mockImplementation(() => Promise.resolve({stderr: '', stdout: ''}))
 
@@ -17,13 +19,13 @@ describe('now()', () => {
   it('calls `npx now --token=$NOW_TOKEN` with no additional args', () => {
     mockEnv({NOW_TOKEN: 'xyz'})
     now()
-    expect(execa).lastCalledWith('npx', ['now', '--token=xyz'], {stderr: 'inherit'})
+    expect(execa).lastCalledWith(NOW_BIN, ['--token=xyz'], {stderr: 'inherit'})
   })
 
   it('calls with additional arguments passed as an array', () => {
     mockEnv({NOW_TOKEN: 'abc'})
     now(['foo', 'bar'])
-    expect(execa).lastCalledWith('npx', ['now', '--token=abc', 'foo', 'bar'], {stderr: 'inherit'})
+    expect(execa).lastCalledWith(NOW_BIN, ['--token=abc', 'foo', 'bar'], {stderr: 'inherit'})
   })
 
   function mockEnv(env) {

src/now.js

@@ -1,10 +1,15 @@
 const execa = require('execa')
 
+const {bin: {now: NOW_BIN_PATH}} = require('now/package.json')
+const NOW_BIN = require.resolve(`now/${NOW_BIN_PATH}`)
+
 module.exports = function now(args = []) {
   const {NOW_TOKEN} = process.env
   if (!NOW_TOKEN) {
     throw new Error(`The NOW_TOKEN env var is required`)
   }
-  const nowArgs = ['now', `--token=${NOW_TOKEN}`, ...args]
-  return execa('npx', nowArgs, {stderr: 'inherit'}).then(res => res.stdout)
+  const nowArgs = [`--token=${NOW_TOKEN}`, ...args]
+  return execa(NOW_BIN, nowArgs, {stderr: 'inherit'}).then(res => res.stdout)
 }
+
+Object.assign(module.exports, {NOW_BIN})