fix typo (#165)

Author: wonda-tea-coffee

CHANGELOG.md

@@ -59,7 +59,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
-- Adding json file extention to extends property, [#40](https://github.com/dividab/tsconfig-paths/pull/40). Thanks to [@cwhite-connectfirst](https://github.com/cwhite-connectfirst) for this fixing this!
+- Adding json file extension to extends property, [#40](https://github.com/dividab/tsconfig-paths/pull/40). Thanks to [@cwhite-connectfirst](https://github.com/cwhite-connectfirst) for this fixing this!
 
 ## [3.3.1] - 2018-04-17
 

src/match-path-sync.ts

@@ -56,7 +56,7 @@ export function createMatchPath(
  * @param absolutePathMappings The paths to try as specified in tsconfig but resolved to absolute form.
  * @param requestedModule The required module name.
  * @param readJson Function that can read json from a path (useful for testing).
- * @param fileExists Function that checks for existance of a file at a path (useful for testing).
+ * @param fileExists Function that checks for existence of a file at a path (useful for testing).
  * @param extensions File extensions to probe for (useful for testing).
  * @param mainFields A list of package.json field names to try when resolving module files.
  * @returns the found path, or undefined if no path was found.