feat: add isNonEmptyString (#66)

Author: wweaver

README.md

@@ -50,11 +50,15 @@ if (isArray(value)) {
 - `isFunction()`
 - `isGuid()`
 - `isInfinity()`
+- `isNegativeNumber()`
 - `isNull()`
 - `isNil()`
+- `isNonEmptyString()`
+- `isNonZeroNumber()`
 - `isNumber()`
 - `isObject()`
 - `isPlainObject()`
+- `isPositiveNumber()`
 - `isRegExp()`
 - `isString()`
 - `isSymbol()`

src/index.spec.ts

@@ -91,6 +91,11 @@ describe('ts-util-is methods', () => {
     expect(util.isString('')).toEqual(true);
   });
 
+  it('ensure value is a non empty string', () => {
+    expect(util.isNonEmptyString('')).toBe(false);
+    expect(util.isNonEmptyString('something')).toBe(true);
+  });
+
   it('ensure value is a symbol', () => {
     expect(util.isSymbol(Symbol())).toEqual(true);
   });

src/index.ts

@@ -184,6 +184,15 @@ export function isString(value: any): value is string {
   return typeof value === 'string';
 }
 
+/**
+ * Determines if a reference is a `String` and not the empty string.
+ *
+ * @param value Reference to check
+ */
+export function isNonEmptyString(value: unknown): value is string {
+  return isString(value) && !!value;
+}
+
 /**
  * Determines if a reference is a `Symbol`.
  *