diff --git a/src/core/cache.ts b/src/core/cache.ts
index b7eb6ed..5373a6d 100644
--- a/src/core/cache.ts
+++ b/src/core/cache.ts
@@ -10,7 +10,7 @@ export interface JSONCache<T = any> {
   find(fn: (value: T, key: string) => boolean): T
 }
 
-interface ManagedJSONCache extends JSONCache {
+interface ManagedJSONCache<T = any> extends JSONCache<T> {
   save(): void
 }
 
@@ -21,14 +21,14 @@ export function loadCache<T>(
   cachePath: string,
   onLoad?: (cache: JSONCache<T>) => void
 ): JSONCache<T> {
-  let cache: JSONCache<T> = caches[cachePath]
+  let cache: ManagedJSONCache<T> = caches[cachePath]
   if (cache) {
     return cache
   }
   let data: any
   try {
     data = fs.readJson(cachePath)
-  } catch (err) {
+  } catch (err: any) {
     if (err.code == fs.NOT_REAL) {
       data = {}
     } else {
diff --git a/src/core/config.ts b/src/core/config.ts
index ffdce13..5de697f 100644
--- a/src/core/config.ts
+++ b/src/core/config.ts
@@ -54,7 +54,7 @@ export function loadConfig(configPath = findConfig(), force?: boolean) {
   let rawConfig: any
   try {
     rawConfig = fs.readJson(configPath)
-  } catch (err) {
+  } catch (err: any) {
     if (err.code == fs.NOT_REAL) return null
     throw err
   }
diff --git a/src/core/git.ts b/src/core/git.ts
index 1230123..17a6d87 100644
--- a/src/core/git.ts
+++ b/src/core/git.ts
@@ -90,7 +90,7 @@ function parseGitString(
   let commit: string | undefined
   let subpath: string | undefined
 
-  if (gitString?.length > 0) {
+  if (gitString) {
     if (gitString.includes(':')) {
       ;[gitString, subpath] = gitString.split(':')
     }
diff --git a/src/core/installPackages.ts b/src/core/installPackages.ts
index 09417ca..ce306b1 100644
--- a/src/core/installPackages.ts
+++ b/src/core/installPackages.ts
@@ -36,7 +36,7 @@ export async function installPackages(packages: Package[], force?: boolean) {
           task.finish()
           log.debug('install completed:', yellow(cwdRelative(pkg.root)))
           log.events.emit('install', pkg)
-        } catch (e) {
+        } catch (e: any) {
           task.finish()
           log.error('Installation failed:', yellow(cwdRelative(pkg.root)))
           if (isTest) {
diff --git a/src/core/sparseClone.ts b/src/core/sparseClone.ts
index 02a3709..99366c2 100644
--- a/src/core/sparseClone.ts
+++ b/src/core/sparseClone.ts
@@ -9,7 +9,7 @@ export function sparseClone(
   url: string,
   branch: string | undefined,
   commit: string | undefined,
-  subpath: string | undefined
+  subpath: string
 ) {
   fs.mkdir(dest)
   let checkoutCommand = `git clone ${url} . --no-checkout --depth 1`