feat: add new known VoidFunction type (#132)

* feat: add new known VoidFunction type

* fix paren wrapping

Author: codebytere

lib/utils.js

@@ -101,6 +101,8 @@ const typify = (type) => {
       return 'Buffer'
     case 'buffer[]':
       return 'Buffer[]'
+    case 'voidfunction':
+      return '(() => void)'
     case 'promise':
       if (innerType) {
         return `Promise<${innerType}>`

test/utils_spec.js

@@ -61,6 +61,10 @@ describe('utils', () => {
       expect(utils.typify('Number')).to.equal('number')
     })
 
+    it('should correctly convert a void function', () => {
+      expect(utils.typify('VoidFunction')).to.equal('(() => void)')
+    })
+
     it('should lower case known array types', () => {
       expect(utils.typify('String[]')).to.equal('string[]')
       expect(utils.typify('Number[]')).to.equal('number[]')