fix: consistent cwd usage

test/fixture/package.json

@@ -0,0 +1,3 @@
+{
+  "main": "entry-file.js"
+}

test/mocha.opts

@@ -1,3 +1,4 @@
+./test/**/*.spec.ts
 --check-leaks
 --require ts-node/register
 --recursive

test/options.spec.ts

@@ -0,0 +1,48 @@
+import { normalizeOptions } from '../src/options'
+import { expect } from 'chai'
+import * as path from 'path'
+
+const ext = process.platform === 'win32' ? '.exe' : ''
+
+describe('options', () => {
+  describe('cwd', () => {
+    it('should use process.cwd() if nothing is provided', () => {
+      const options = normalizeOptions()
+      expect(options.cwd).to.equal(process.cwd())     
+    })
+    it('should use the main module in a package directory', () => {
+      const options = normalizeOptions()
+      expect(options.input).to.equal(path.resolve('./index.js'))
+    })
+    it('should resolve pathed options against cwd', () => {
+      const cwd = '/a/b/c'
+      const options = normalizeOptions({ 
+        cwd, 
+        input: '123.js',
+        output: 'abc',
+        temp: './d' 
+      })
+      expect(options.temp).to.equal(path.resolve(cwd, './d'))
+      expect(options.input).to.equal(path.resolve(cwd, '123.js'))
+      expect(options.output).to.equal(path.resolve(cwd, `abc${ext}`))
+    })
+  })
+  describe('output', () => {
+    it('should work', () => {
+      const options = normalizeOptions({
+        output: './some-output'
+      })
+      expect(options.output).to.equal(path.resolve(`./some-output${ext}`))
+    })
+    it('should default to the input file name if not index', () => {
+      const options = normalizeOptions({
+        input: 'src/folder/app.js'
+      })
+      expect(options.output).to.equal(path.resolve(`./app${ext}`))
+    }) 
+    it('should default to the folder/project name if filename is index', () => {
+      const options = normalizeOptions()
+      expect(options.output).to.equal(path.resolve(`./nexe${ext}`))
+    })
+  })
+})