Update deps, enforce return type.

src/index.ts

@@ -41,7 +41,7 @@ function getBaseURL(): string {
     return (new URL(baseUrl)).toString()
 }
 
-function installLocalOption(yargs: yargs.Argv) {
+function installLocalOption(yargs: yargs.Argv): yargs.Argv {
     return yargs.option('installLocal', {
         describe: 'Install the generated distribution to your local Helios data folder.',
         type: 'boolean',

src/structure/spec_model/module/ToggleableModule.struct.ts

@@ -73,11 +73,11 @@ export abstract class ToggleableModuleStructure extends ModuleStructure {
     protected getNamespaceMapper(namespace: ToggleableNamespace): (x: Module) => void {
         switch(namespace) {
             case ToggleableNamespace.REQUIRED:
-                return () => { /* do nothing */ }
+                return (): void => { /* do nothing */ }
             case ToggleableNamespace.OPTIONAL_ON:
-                return (x) => x.required = { value: false }
+                return (x): void => { x.required = { value: false } }
             case ToggleableNamespace.OPTIONAL_OFF:
-                return (x) => x.required = { value: false, def: false }
+                return (x): void => { x.required = { value: false, def: false } }
         }
     }
 

src/util/SchemaUtil.ts

@@ -24,7 +24,7 @@ export enum SchemaTypes {
     ServerMetaSchema = 'ServerMetaSchema'
 }
 
-function getSchemaFileName(typeName: string) {
+function getSchemaFileName(typeName: string): string {
     return `${typeName}.schema.json`
 }