diff --git a/src/api/install.ts b/src/api/install.ts
index b22a53e76d..16046a77fa 100644
--- a/src/api/install.ts
+++ b/src/api/install.ts
@@ -5,7 +5,7 @@ import pLimit = require('p-limit')
 import npa = require('npm-package-arg')
 import symlinkDir from 'symlink-dir'
 import pFilter = require('p-filter')
-import getLinkTarget = require('get-link-target')
+import isInnerLink from '../isInnerLink'
 import {PnpmOptions, StrictPnpmOptions, Dependencies} from '../types'
 import createGot from '../network/got'
 import getContext, {PnpmContext} from './getContext'
@@ -236,23 +236,6 @@ async function installInContext (
   }
 }
 
-async function isInnerLink (modules: string, depName: string) {
-  let linkTarget: string
-  try {
-    const linkPath = path.join(modules, depName)
-    linkTarget = await getLinkTarget(linkPath)
-  } catch (err) {
-    if (err.code === 'ENOENT') return true
-    throw err
-  }
-
-  if (linkTarget.startsWith(modules)) {
-    return true
-  }
-  logger.info(`${depName} is linked to ${modules} from ${linkTarget}`)
-  return false
-}
-
 async function createInstallCmd (opts: StrictPnpmOptions, shrinkwrap: Shrinkwrap): Promise<InstallContext> {
   return {
     installs: {},
diff --git a/src/isInnerLink.ts b/src/isInnerLink.ts
new file mode 100644
index 0000000000..d38b1c32b6
--- /dev/null
+++ b/src/isInnerLink.ts
@@ -0,0 +1,20 @@
+import logger from 'pnpm-logger'
+import path = require('path')
+import getLinkTarget = require('get-link-target')
+
+export default async function isInnerLink (modules: string, depName: string) {
+  let linkTarget: string
+  try {
+    const linkPath = path.join(modules, depName)
+    linkTarget = await getLinkTarget(linkPath)
+  } catch (err) {
+    if (err.code === 'ENOENT') return true
+    throw err
+  }
+
+  if (linkTarget.startsWith(modules)) {
+    return true
+  }
+  logger.info(`${depName} is linked to ${modules} from ${linkTarget}`)
+  return false
+}
diff --git a/tsconfig.json b/tsconfig.json
index 1e41b35266..151ac3769d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -60,8 +60,10 @@
     "src/index.ts",
     "src/install/fetch.ts",
     "src/install/fetchResolution.ts",
+    "src/install/getIsInstallable.ts",
     "src/install/installMultiple.ts",
     "src/install/postInstall.ts",
+    "src/isInnerLink.ts",
     "src/link/index.ts",
     "src/link/linkBins.ts",
     "src/link/linkPeers.ts",