chore: workspace improvements (#282)

packages/utils/src/predicate/predicate.ts

@@ -0,0 +1,48 @@
+export function isString(value: unknown): value is string {
+  return typeof value === 'string';
+}
+
+export function isNumber(value: unknown): value is number {
+  return typeof value === 'number';
+}
+
+export function isBoolean(value: unknown): value is boolean {
+  return typeof value === 'boolean';
+}
+
+export function isFunction(value: unknown): value is (...args: any[]) => any {
+  return typeof value === 'function';
+}
+
+export function isNull(value: unknown): value is null {
+  return value === null;
+}
+
+export function isUndefined(value: unknown): value is undefined {
+  return typeof value === 'undefined';
+}
+
+export function isNil(value: unknown): value is null | undefined {
+  return value == null;
+}
+
+export function isPromise(value: unknown): value is Promise<any> {
+  return value instanceof Promise;
+}
+
+/**
+ * Check if a value is an object, excluding null.
+ */
+export function isObject(value: unknown): value is object {
+  return value !== null && typeof value === 'object';
+}
+
+/**
+ * Check if a value is an AbortError.
+ */
+export function isAbortError(value: unknown): value is Error {
+  return (
+    value instanceof Error
+    && value.name === 'AbortError'
+  );
+}