Add nullability into signature

Kanchalai Tanglertsampan · Kanchalai Tanglertsampan · commit 95d4983c6e13 · 2016-04-05T11:38:12.000-07:00
diff --git a/src/lib/es2015.collection.d.ts b/src/lib/es2015.collection.d.ts
@@ -2,7 +2,7 @@ interface Map<K, V> {
     clear(): void;
     delete(key: K): boolean;
     forEach(callbackfn: (value: V, index: K, map: Map<K, V>) => void, thisArg?: any): void;
-    get(key: K): V;
+    get(key: K): V | undefined;
     has(key: K): boolean;
     set(key: K, value?: V): Map<K, V>;
     readonly size: number;
@@ -18,7 +18,7 @@ declare var Map: MapConstructor;
 interface WeakMap<K, V> {
     clear(): void;
     delete(key: K): boolean;
-    get(key: K): V;
+    get(key: K): V | undefined;
     has(key: K): boolean;
     set(key: K, value?: V): WeakMap<K, V>;
 
diff --git a/src/lib/es2015.core.d.ts b/src/lib/es2015.core.d.ts
@@ -10,7 +10,7 @@ interface Array<T> {
       * @param thisArg If provided, it will be used as the this value for each invocation of 
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: T, index: number, obj: Array<T>) => boolean, thisArg?: any): T;
+    find(predicate: (value: T, index: number, obj: Array<T>) => boolean, thisArg?: any): T | undefined;
 
     /** 
       * Returns the index of the first element in the array where predicate is true, and undefined 
@@ -21,7 +21,7 @@ interface Array<T> {
       * @param thisArg If provided, it will be used as the this value for each invocation of 
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: T) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: T) => boolean, thisArg?: any): number | undefined;
 
     /**
       * Returns the this object after filling the section identified by start and end with value
@@ -379,7 +379,7 @@ interface String {
       * If there is no element at that position, the result is undefined. 
       * If a valid UTF-16 surrogate pair does not begin at pos, the result is the code unit at pos.
       */
-    codePointAt(pos: number): number;
+    codePointAt(pos: number): number | undefined;
 
     /**
       * Returns true if searchString appears as a substring of the result of converting this 
diff --git a/src/lib/es2015.symbol.d.ts b/src/lib/es2015.symbol.d.ts
@@ -30,7 +30,7 @@ interface SymbolConstructor {
       * Otherwise, returns a undefined.
       * @param sym Symbol to find the key for.
       */
-    keyFor(sym: symbol): string;
+    keyFor(sym: symbol): string | undefined;
 }
 
 declare var Symbol: SymbolConstructor;

Original file line number	Diff line number	Diff line change
`@@ -30,7 +30,7 @@ interface SymbolConstructor {`
`30`	`30`	`* Otherwise, returns a undefined.`
`31`	`31`	`* @param sym Symbol to find the key for.`
`32`	`32`	`*/`
`33`		`- keyFor(sym: symbol): string;`
	`33`	`+ keyFor(sym: symbol): string \| undefined;`
`34`	`34`	`}`
`35`	`35`
`36`	`36`	`declare var Symbol: SymbolConstructor;`