feat: inject path to node_modules/.bin (fixes #35) (#36)

* feat: inject path to node_modules/.bin (fixes #35)

* feat: inject path to node_modules/.bin (fixes #35)

cspell.yaml

@@ -11,6 +11,7 @@ words:
   - interruptible
   - jiti
   - kuizinas
+  - pipefail
   - randomcolor
   - roarr
   - SIGINT

src/createSpawn.test.ts

@@ -9,6 +9,14 @@ it('returns outputs', async () => {
   expect(String(result?.stdout)).toEqual('Hello, World!\n');
 });
 
+it('injects path to node_modules/.bin', async () => {
+  const spawn = createSpawn('foo');
+
+  const result = await spawn`echo $PATH`;
+
+  expect(String(result?.stdout)).toMatch(/node_modules\/\.bin/u);
+});
+
 it('rejects if process produces an error', async () => {
   const spawn = createSpawn('foo');
 

src/createSpawn.ts

@@ -1,5 +1,6 @@
 // cspell:words nothrow
 
+import { findNearestDirectory } from './findNearestDirectory';
 import { Logger } from './Logger';
 import { type Throttle } from './types';
 import chalk from 'chalk';
@@ -64,8 +65,12 @@ export const createSpawn = (
   const colorText = chalk.hex(randomColor({ luminosity: 'dark' }));
 
   return async (pieces: TemplateStringsArray, ...args: any[]) => {
+    const binPath = (await findNearestDirectory('node_modules', cwd)) + '/.bin';
+
     $.cwd = cwd;
 
+    $.prefix = `set -euo pipefail; export PATH="${binPath}:$PATH";`;
+
     let onStdout: (chunk: Buffer) => void;
     let onStderr: (chunk: Buffer) => void;
 

src/findNearestDirectory.ts

@@ -0,0 +1,32 @@
+import fs from 'node:fs/promises';
+import path from 'node:path';
+
+export const findNearestDirectory = async (
+  fileName: string,
+  startPath: string,
+): Promise<string | null> => {
+  let currentPath = startPath;
+
+  // eslint-disable-next-line no-constant-condition
+  while (true) {
+    const targetPath = path.join(currentPath, fileName);
+
+    try {
+      await fs.access(targetPath, fs.constants.F_OK);
+    } catch {
+      const nextPath = path.resolve(currentPath, '..');
+
+      if (nextPath === currentPath) {
+        break;
+      }
+
+      currentPath = nextPath;
+
+      continue;
+    }
+
+    return targetPath;
+  }
+
+  return null;
+};