From c4b70febc65857900ee5c4a4332bb219dfd2a78e Mon Sep 17 00:00:00 2001
From: amikhalev <alexmikhalevalex@gmail.com>
Date: Mon, 26 Jun 2017 15:21:56 -0600
Subject: [PATCH] Added string literal types for @types/semver

---
 types/semver/index.d.ts      |  8 +++++---
 types/semver/semver-tests.ts | 18 +++++++++++++++---
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/types/semver/index.d.ts b/types/semver/index.d.ts
index 60e7275f7a..336fa85574 100644
--- a/types/semver/index.d.ts
+++ b/types/semver/index.d.ts
@@ -5,6 +5,8 @@
 
 export const SEMVER_SPEC_VERSION: "2.0.0";
 
+export type ReleaseType = "major" | "premajor" | "minor" | "preminor" | "patch" | "prepatch" | "prerelease";
+
 /**
  * Return the parsed version, or null if it's not valid.
  */
@@ -16,7 +18,7 @@ export function clean(version: string, loose?: boolean): string;
 /**
  * Return the version incremented by the release type (major, minor, patch, or prerelease), or null if it's not valid.
  */
-export function inc(v: string, release: string, loose?: boolean): string;
+export function inc(v: string, release: ReleaseType, loose?: boolean): string;
 /**
  * Return the major version number.
  */
@@ -76,7 +78,7 @@ export function rcompare(v1: string, v2: string, loose?: boolean): number;
 /**
  * Returns difference between two versions by the release type (major, premajor, minor, preminor, patch, prepatch, or prerelease), or null if the versions are the same.
  */
-export function diff(v1: string, v2: string, loose?: boolean): string;
+export function diff(v1: string, v2: string, loose?: boolean): ReleaseType;
 
 // Ranges
 /**
@@ -127,7 +129,7 @@ export class SemVer {
     compare(other: SemVer): number;
     compareMain(other: SemVer): number;
     comparePre(other: SemVer): number;
-    inc(release: string): SemVer;
+    inc(release: ReleaseType): SemVer;
 }
 
 export class Comparator {
diff --git a/types/semver/semver-tests.ts b/types/semver/semver-tests.ts
index b7a1299ad3..42088eef4d 100644
--- a/types/semver/semver-tests.ts
+++ b/types/semver/semver-tests.ts
@@ -4,7 +4,7 @@ let obj: {};
 let bool: boolean;
 let num: number;
 let str: string;
-let diff: string;
+let diff: semver.ReleaseType;
 let x: any = null;
 let arr: any[];
 let exp: RegExp;
@@ -22,7 +22,13 @@ str = semver.clean(str);
 
 str = semver.valid(str, loose);
 str = semver.clean(str, loose);
-str = semver.inc(str, str, loose);
+str = semver.inc(str, "major", loose);
+str = semver.inc(str, "premajor", loose);
+str = semver.inc(str, "minor", loose);
+str = semver.inc(str, "preminor", loose);
+str = semver.inc(str, "patch", loose);
+str = semver.inc(str, "prepatch", loose);
+str = semver.inc(str, "prerelease", loose);
 num = semver.major(str, loose);
 num = semver.minor(str, loose);
 num = semver.patch(str, loose);
@@ -66,7 +72,13 @@ strArr = ver.prerelease;
 num = ver.compare(ver);
 num = ver.compareMain(ver);
 num = ver.comparePre(ver);
-ver = ver.inc(str);
+ver = ver.inc("major");
+ver = ver.inc("premajor");
+ver = ver.inc("minor");
+ver = ver.inc("preminor");
+ver = ver.inc("patch");
+ver = ver.inc("prepatch");
+ver = ver.inc("prerelease");
 
 const comp = new semver.Comparator(str, bool);
 str = comp.toString();