[bugfix]: support Node versions 10-14

CHANGELOG.md

@@ -1,5 +1,7 @@
 # main (unreleased)
 
+-[[bugfix]: support Node versions 10-14](https://github.com/upgradejs/depngn/pull/35)
+
 # 0.3.0
 -[[feature]: add the ability to perform the check in the specified path using --cwd option](https://github.com/upgradejs/depngn/pull/30)
 

src/cli/reporter/html.ts

@@ -1,4 +1,4 @@
-import { writeFile } from 'fs/promises';
+import { writeFile } from '../../utils';
 import { CompatData } from '../../types';
 
 export async function createHtml(compatData: Record<string, CompatData>, version: string, path: string = 'compat.html') {
@@ -71,4 +71,4 @@ export async function createHtml(compatData: Record<string, CompatData>, version
 
   await writeFile(path, out);
   console.log(`File generated at ${path}`);
-}
+}

src/cli/reporter/json.ts

@@ -1,11 +1,12 @@
-import { writeFile } from 'fs/promises';
+import { writeFile } from '../../utils';
 import { CompatData } from '../../types';
 
 export async function createJson(compatData: Record<string, CompatData>, version: string, path: string = 'compat.json') {
   const out = JSON.stringify({
     node: version,
     dependencies: compatData,
   }, null, 2);
+
   await writeFile(path, out);
   console.log(`File generated at ${path}`);
 }

src/queries/getDependencies.ts

@@ -1,4 +1,4 @@
-import { asyncExec } from './exec';
+import { asyncExec } from '../utils';
 import { PackageList, Manager } from '../types';
 
 export async function getDependencies(manager: Manager): Promise<PackageList> {

src/queries/getEngines.ts

@@ -1,4 +1,4 @@
-import { asyncExec } from './exec';
+import { asyncExec } from '../utils';
 import { Manager, PackageList, PackageManagerName } from '../types';
 
 export async function getEngines(deps: PackageList, manager: Manager) {

src/queries/getPackageManager.ts

@@ -1,4 +1,4 @@
-import { access } from 'fs/promises';
+import { access } from '../utils';
 import { Manager, PackageManagerName } from '../types';
 
 const PACKAGE_MANAGER: Record<string, Manager> = {

src/queries/index.ts

@@ -1,2 +1 @@
 export * from './getCompatData';
-export * from './exec';

src/utils/index.ts

@@ -0,0 +1,14 @@
+import { exec } from 'child_process';
+import { promisify } from 'util';
+import { writeFile as syncWriteFile, access as syncAccess } from 'fs';
+
+// `fs/promises` is only available from Node v14 onwards
+// so we import the sync versions of `writeFile` and `access` and transform them into 
+// async versions using `promisify` (available from Node v8 onwards)
+// if we ever decided to drop support for Node <v14, we can revert to using `fs/promises`
+//
+// `exec` doesn't have a promise version so we have to promisify it no matter what
+
+export const access = promisify(syncAccess);
+export const asyncExec = promisify(exec);
+export const writeFile = promisify(syncWriteFile);