refactor: deduplicate assertNonArray utility function

Author: micalevisk

actions/generate.action.ts

@@ -19,12 +19,7 @@ import {
   shouldGenerateSpec,
 } from '../lib/utils/project-utils';
 import { AbstractAction } from './abstract.action';
-
-function assertNonArray<T>(value: T): asserts value is Exclude<T, any[]> {
-  if (Array.isArray(value)) {
-    throw new TypeError('Expected a non-array value');
-  }
-}
+import { assertNonArray } from '../lib/utils/type-assertions';
 
 export class GenerateAction extends AbstractAction {
   public async handle(inputs: Input[], options: Input[]) {

actions/new.action.ts

@@ -23,6 +23,7 @@ import { EMOJIS, MESSAGES } from '../lib/ui';
 import { normalizeToKebabOrSnakeCase } from '../lib/utils/formatting';
 import { gracefullyExitOnPromptError } from '../lib/utils/gracefully-exit-on-prompt-error';
 import { AbstractAction } from './abstract.action';
+import { assertNonArray } from '../lib/utils/type-assertions';
 
 export class NewAction extends AbstractAction {
   public async handle(inputs: Input[], options: Input[]) {
@@ -65,12 +66,6 @@ export class NewAction extends AbstractAction {
   }
 }
 
-function assertNonArray<T>(value: T): asserts value is Exclude<T, any[]> {
-  if (Array.isArray(value)) {
-    throw new TypeError('Expected a non-array value');
-  }
-}
-
 const getApplicationNameInput = (inputs: Input[]) =>
   inputs.find((input) => input.name === 'name');
 

actions/start.action.ts

@@ -13,12 +13,7 @@ import {
 import { ERROR_PREFIX } from '../lib/ui';
 import { treeKillSync as killProcessSync } from '../lib/utils/tree-kill';
 import { BuildAction } from './build.action';
-
-function assertNonArray<T>(value: T): asserts value is Exclude<T, any[]> {
-  if (Array.isArray(value)) {
-    throw new TypeError('Expected a non-array value');
-  }
-}
+import { assertNonArray } from '../lib/utils/type-assertions';
 
 export class StartAction extends BuildAction {
   public async handle(commandInputs: Input[], commandOptions: Input[]) {

lib/utils/type-assertions.ts

@@ -0,0 +1,7 @@
+export function assertNonArray<T>(
+  value: T,
+): asserts value is Exclude<T, any[]> {
+  if (Array.isArray(value)) {
+    throw new TypeError('Expected a non-array value');
+  }
+}