isString() function

Determines whether a value is a string.

Signature

export declare function isString(value: unknown): boolean;

Parameters

Parameter	Type	Description
value	unknown	The value to test.

Returns

boolean

true if the value is a string, false otherwise.

Remarks

This function acts as a TypeScript type guard, narrowing the type to string within conditional blocks. This enables safe string operations without type assertions.

Example usage:

if (isString(value)) {
  // TypeScript knows value is a string here
  const length = value.length;
}

Only returns true for primitive string values, not String objects created with new String().

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