Change default optional value for methods and events

Author: MarshallOfSound

cli.js

@@ -38,7 +38,7 @@ if (inFile) {
 
 const typeCheck = () => {
   const tscExec = path.resolve(require.resolve('typescript'), '../../bin/tsc')
-  const tscChild = childProcess.spawn(tscExec, ['--project', 'tsconfig.json'], {
+  const tscChild = childProcess.spawn('node', [tscExec, '--project', 'tsconfig.json'], {
     cwd: path.resolve(__dirname, 'test-smoke/electron')
   })
   tscChild.stdout.on('data', d => console.log(d.toString()))

lib/module-declaration.js

@@ -66,7 +66,7 @@ const generateModuleDeclaration = (module, index, API) => {
           newType = utils.genMethodString(paramInterfaces, module, eventListenerArg, eventListenerArg.parameters, null, true)
         }
 
-        args.push(`${argString}${utils.paramify(eventListenerArg.name)}${utils.isOptional(eventListenerArg) ? '?' : ''}: ${newType}`)
+        args.push(`${argString}${utils.paramify(eventListenerArg.name)}${utils.isOptional(eventListenerArg, false) ? '?' : ''}: ${newType}`)
       })
       listener = `(${args.join(`,\n${indent}`)}) => void`
     }

lib/utils.js

@@ -116,27 +116,30 @@ const isEmitter = (module) => {
       return true
   }
 }
-const isOptional = (param) => {
+const isOptional = (param, defaultReturn) => {
+  if (typeof defaultReturn === 'undefined') {
+    defaultReturn = true
+  }
   // Does the description contain the word "optional"?
   if (/optional/i.test(param.description)) {
     return true
   }
 
   // Did we pass a "required"?
-  if (param.required) {
+  if (typeof param.required !== 'undefined') {
     return !param.required
   }
 
   // Does the description not contain the word "required"?
-  if (param.description && !/required/i.test(param.description)) {
+  if (param.description && !/required/i.test(param.description) && /\(.+\)/.test(param.description)) {
     return true
   }
 
   // Let's be optimistic - having optional props marked as required
   // ruins the developer experience, why a false negative is only
   // slightly annoying
   debug(`Could not determine optionality for ${param.name}`)
-  return true
+  return defaultReturn
 }
 
 const genMethodString = (paramInterfaces, module, moduleMethod, parameters, returns, includeType, paramTypePrefix) => {
@@ -166,7 +169,7 @@ const genMethodString = (paramInterfaces, module, moduleMethod, parameters, retu
     }
 
     const name = paramify(param.name)
-    const optional = isOptional(param) ? '?' : ''
+    const optional = isOptional(param, false) ? '?' : ''
 
     // Figure out this parameter's type
     let type