@metreeca/core - v0.9.1

Type guards, safe casts, and core utilities.

Runtime Guards

Type guards for runtime JavaScript types.

isDefined: Checks if a value is not undefined or null.
isEmpty: Checks if a value is an empty plain object or an empty array.
isSymbol: Checks if a value is a symbol.
isFunction: Checks if a value is a function.
isError: Checks if a value is an Error instance.
isPromise: Checks if a value is a promise.
isIterable: Checks if a value is iterable.
isAsyncIterable: Checks if a value is async iterable.

Value Guards

Type guards for JSON-like primitive values and data structures.

isBoolean: Checks if a value is a boolean.
isNumber: Checks if a value is a finite number.
isString: Checks if a value is a string.
isObject: Checks if a value is a plain object.
isArray: Checks if a value is an array.

Value Casts

Safe casts for JSON-like primitive values and data structures.

asBoolean: Retrieves a value as a boolean if it is one, otherwise returns undefined.
asNumber: Retrieves a value as a number if it is one, otherwise returns undefined.
asString: Retrieves a value as a string if it is one, otherwise returns undefined.
asObject: Retrieves a value as a plain object if it is one, otherwise returns undefined.
asArray: Retrieves a value as an array if it is one, otherwise returns undefined.

Structural Utilities

Utilities for structural operations on runtime types.

equals: Checks deep object equality.
immutable: Creates an immutable deep clone.

Error Utilities

Utilities for error handling.

error: Throws an error in expression contexts.