Walk directory for needed paths (#103)

Ref #102 

Depending on the structure of the action repository, the `node_modules`
and `package.json` needed by `local-action` may not exist in the
expected locations. This PR updates the behavior of the action to
instead walk the directory structure and attempt to locate the paths
more dynamically, allowing support for more customized action
repositories.

.gitignore

@@ -5,3 +5,6 @@ node_modules
 npm-debug.log*
 reports
 Thumbs.db
+
+# Hack to keep the fake node_modules dirs for tests
+!__fixtures__/**/node_modules

README.md

@@ -88,8 +88,8 @@ the following when preparing for release:
   [`@vercel/ncc`](https://www.npmjs.com/package/@vercel/ncc)
 
 **This tool supports non-transpiled action code only.** This is because it uses
-[`proxyquire`](https://github.com/thlorenz/proxyquire) to override GitHub
-Actions Toolkit dependencies (e.g
+[`quibble`](https://github.com/testdouble/quibble) to override GitHub Actions
+Toolkit dependencies (e.g
 [`@actions/core`](https://www.npmjs.com/package/@actions/core)). In transpiled
 code, this simply doesn't work.
 

__tests__/commands/run.test.ts

@@ -20,7 +20,7 @@ jest.unstable_mockModule('../../src/utils/output.js', () => {
 const { action } = await import('../../src/commands/run.js')
 
 // Prevent output during tests
-jest.spyOn(console, 'log').mockImplementation(() => {})
+// jest.spyOn(console, 'log').mockImplementation(() => {})
 jest.spyOn(console, 'table').mockImplementation(() => {})
 
 describe('Command: run', () => {
@@ -35,28 +35,8 @@ describe('Command: run', () => {
     jest.resetAllMocks()
   })
 
-  describe('TypeScript', () => {
-    it('Action: success', async () => {
-      EnvMeta.actionFile = `./__fixtures__/typescript/success/action.yml`
-      EnvMeta.actionPath = `./__fixtures__/typescript/success`
-      EnvMeta.dotenvFile = `./__fixtures__/typescript/success/.env.fixture`
-      EnvMeta.entrypoint = `./__fixtures__/typescript/success/src/main.ts`
-
-      await expect(action()).resolves.toBeUndefined()
-    })
-
-    it('Action: no-import', async () => {
-      EnvMeta.actionFile = `./__fixtures__/typescript/no-import/action.yml`
-      EnvMeta.actionPath = `./__fixtures__/typescript/no-import`
-      EnvMeta.dotenvFile = `./__fixtures__/typescript/no-import/.env.fixture`
-      EnvMeta.entrypoint = `./__fixtures__/typescript/no-import/src/main.ts`
-
-      await expect(action()).resolves.toBeUndefined()
-    })
-  })
-
   describe('TypeScript ESM', () => {
-    it('Action: success', async () => {
+    it('TypeScript ESM Action: success', async () => {
       EnvMeta.actionFile = `./__fixtures__/typescript-esm/success/action.yml`
       EnvMeta.actionPath = `./__fixtures__/typescript-esm/success`
       EnvMeta.dotenvFile = `./__fixtures__/typescript-esm/success/.env.fixture`
@@ -68,7 +48,7 @@ describe('Command: run', () => {
       expect(quibbleEsm).toHaveBeenCalled()
     })
 
-    it('Action: no-import', async () => {
+    it('TypeScript ESM Action: no-import', async () => {
       EnvMeta.actionFile = `./__fixtures__/typescript-esm/no-import/action.yml`
       EnvMeta.actionPath = `./__fixtures__/typescript-esm/no-import`
       EnvMeta.dotenvFile = `./__fixtures__/typescript-esm/no-import/.env.fixture`
@@ -82,7 +62,7 @@ describe('Command: run', () => {
   })
 
   describe('JavaScript', () => {
-    it('Action: success', async () => {
+    it('JavaScript Action: success', async () => {
       EnvMeta.actionFile = `./__fixtures__/javascript/success/action.yml`
       EnvMeta.actionPath = `./__fixtures__/javascript/success`
       EnvMeta.dotenvFile = `./__fixtures__/javascript/success/.env.fixture`
@@ -91,7 +71,7 @@ describe('Command: run', () => {
       await expect(action()).resolves.toBeUndefined()
     })
 
-    it('Action: no-import', async () => {
+    it('JavaScript Action: no-import', async () => {
       EnvMeta.actionFile = `./__fixtures__/javascript/no-import/action.yml`
       EnvMeta.actionPath = `./__fixtures__/javascript/no-import`
       EnvMeta.dotenvFile = `./__fixtures__/javascript/no-import/.env.fixture`
@@ -102,7 +82,7 @@ describe('Command: run', () => {
   })
 
   describe('JavaScript (ESM)', () => {
-    it('Action: success', async () => {
+    it('JavaScript ESM Action: success', async () => {
       EnvMeta.actionFile = `./__fixtures__/javascript/success/action.yml`
       EnvMeta.actionPath = `./__fixtures__/javascript/success`
       EnvMeta.dotenvFile = `./__fixtures__/javascript/success/.env.fixture`
@@ -113,7 +93,7 @@ describe('Command: run', () => {
       expect(quibbleDefault).toHaveBeenCalled()
     })
 
-    it('Action: no-import', async () => {
+    it('JavaScript ESM Action: no-import', async () => {
       EnvMeta.actionFile = `./__fixtures__/javascript/no-import/action.yml`
       EnvMeta.actionPath = `./__fixtures__/javascript/no-import`
       EnvMeta.dotenvFile = `./__fixtures__/javascript/no-import/.env.fixture`

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@github/local-action",
   "description": "Local Debugging for GitHub Actions",
-  "version": "2.1.1",
+  "version": "2.1.2",
   "type": "module",
   "author": "Nick Alteen <[email protected]>",
   "private": false,
@@ -60,7 +60,6 @@
     "@types/figlet": "^1.5.8",
     "@types/jest": "^29.5.12",
     "@types/node": "^22.0.2",
-    "@types/proxyquire": "^1.3.31",
     "@typescript-eslint/eslint-plugin": "^8.4.0",
     "@typescript-eslint/parser": "^8.4.0",
     "eslint": "^8.57.0",

src/commands/run.ts

@@ -1,11 +1,14 @@
 import { config } from 'dotenv'
+import { createRequire } from 'module'
 import quibble from 'quibble'
 import { CORE_STUBS, CoreMeta } from '../stubs/core-stubs.js'
 import { EnvMeta } from '../stubs/env-stubs.js'
 import type { Action } from '../types.js'
 import { printTitle } from '../utils/output.js'
 import { isESM } from '../utils/package.js'
 
+const require = createRequire(import.meta.url)
+
 export async function action(): Promise<void> {
   const { Chalk } = await import('chalk')
   const chalk = new Chalk()
@@ -90,24 +93,63 @@ export async function action(): Promise<void> {
 
   printTitle(CoreMeta.colors.green, 'Running Action')
 
-  // Stub the `@actions/toolkit` libraries and run the action. Quibble requires
-  // a different approach depending on if this is an ESM action.
+  // Get the node_modules path, starting with the entrypoint.
+  /* istanbul ignore next */
+  const dirs =
+    path.dirname(EnvMeta.entrypoint).split('/') || // Unix
+    path.dirname(EnvMeta.entrypoint).split('\\') || // Windows
+    []
+  while (dirs.length > 0) {
+    // Check if the current directory has a node_modules directory.
+    if (fs.existsSync(path.join(...dirs, 'node_modules'))) break
+
+    // Move up the directory tree.
+    dirs.pop()
+  }
+  /* istanbul ignore if */
+  if (dirs.length === 0)
+    throw new Error('Could not find node_modules directory')
+
+  // Stub the `@actions/toolkit` libraries and run the action. Quibble and
+  // local-action require a different approach depending on if the called action
+  // is written in ESM.
   if (isESM()) {
     // eslint-disable-next-line @typescript-eslint/no-unsafe-call
     await quibble.esm(
-      `${path.resolve(EnvMeta.actionPath)}/node_modules/@actions/core/lib/core.js`,
+      path.resolve(
+        ...dirs,
+        'node_modules',
+        '@actions',
+        'core',
+        'lib',
+        'core.js'
+      ),
       CORE_STUBS
     )
+
+    // ESM actions need to be imported, not required.
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+    const { run } = await import(path.resolve(EnvMeta.entrypoint))
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-call
+    await run()
   } else {
     // eslint-disable-next-line @typescript-eslint/no-unsafe-call
     quibble(
-      `${path.resolve(EnvMeta.actionPath)}/node_modules/@actions/core`,
+      path.resolve(
+        ...dirs,
+        'node_modules',
+        '@actions',
+        'core',
+        'lib',
+        'core.js'
+      ),
       CORE_STUBS
     )
-  }
 
-  // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
-  const { run } = await import(path.resolve(EnvMeta.entrypoint))
-  // eslint-disable-next-line @typescript-eslint/no-unsafe-call
-  await run()
+    // CJS actions need to be required, not imported.
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment, import/no-dynamic-require
+    const { run } = require(path.resolve(EnvMeta.entrypoint))
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-call
+    await run()
+  }
 }

src/stubs/summary-stubs.ts

@@ -59,8 +59,7 @@ export class Summary {
         CoreMeta.stepSummaryPath,
         fs.constants.R_OK | fs.constants.W_OK
       )
-    } catch (error) {
-      console.error(error)
+    } catch {
       throw new Error(
         `Unable to access summary file: '${CoreMeta.stepSummaryPath}'. Check if the file has correct read/write permissions.`
       )

src/utils/package.ts

@@ -1,4 +1,5 @@
 import fs from 'fs'
+import { dirname, join } from 'path'
 import { EnvMeta } from '../stubs/env-stubs.js'
 
 /**
@@ -7,12 +8,29 @@ import { EnvMeta } from '../stubs/env-stubs.js'
  * @returns True if the project is an ESM module, false otherwise.
  */
 export function isESM(): boolean {
-  const packageJson = JSON.parse(
-    fs.readFileSync(`${EnvMeta.actionPath}/package.json`, {
-      encoding: 'utf8',
-      flag: 'r'
-    })
-  ) as { type: string }
+  // Starting at this directory, walk up the directory tree until we find a
+  // package.json file.
+  /* istanbul ignore next */
+  const dirs =
+    dirname(EnvMeta.entrypoint).split('/') || // Unix
+    dirname(EnvMeta.entrypoint).split('\\') || // Windows
+    []
+  while (dirs.length > 0) {
+    // Check if the current directory has a packge.json.
+    if (fs.existsSync(join(...dirs, 'package.json'))) {
+      const packageJson = JSON.parse(
+        fs.readFileSync(join(...dirs, 'package.json'), 'utf8')
+      ) as { [key: string]: any }
 
-  return packageJson.type === 'module'
+      return packageJson.type === 'module'
+    }
+
+    // Move up the directory tree.
+    dirs.pop()
+  }
+
+  // If we reach the root directory and still haven't found a package.json
+  // file, assume that the project is not an ESM module.
+  /* istanbul ignore next */
+  return false
 }