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index.ts
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index.ts
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/* eslint-disable @typescript-eslint/ban-types */
import { getObjectType, isObjectOfType, isOfType, isPrimitiveType } from './helpers';
import type { Class, PlainObject, Primitive, TypeName } from './types';
const DOM_PROPERTIES_TO_CHECK: Array<keyof HTMLElement> = [
'innerHTML',
'ownerDocument',
'style',
'attributes',
'nodeValue',
];
function is(value: unknown): TypeName {
if (value === null) {
return 'null';
}
switch (typeof value) {
case 'bigint':
return 'bigint';
case 'boolean':
return 'boolean';
case 'number':
return 'number';
case 'string':
return 'string';
case 'symbol':
return 'symbol';
case 'undefined':
return 'undefined';
default:
}
if (is.array(value)) {
return 'Array';
}
if (is.plainFunction(value)) {
return 'Function';
}
const tagType = getObjectType(value);
if (tagType) {
return tagType;
}
/* c8 ignore next 3 */
return 'Object';
}
is.array = Array.isArray;
is.arrayOf = (target: unknown[], predicate: (v: unknown) => boolean): boolean => {
if (!is.array(target) && !is.function(predicate)) {
return false;
}
return target.every(d => predicate(d));
};
is.asyncGeneratorFunction = (value: unknown): value is (...arguments_: any[]) => Promise<unknown> =>
getObjectType(value) === 'AsyncGeneratorFunction';
is.asyncFunction = isObjectOfType<Function>('AsyncFunction');
is.bigint = isOfType<bigint>('bigint');
is.boolean = (value: unknown): value is boolean => {
return value === true || value === false;
};
is.date = isObjectOfType<Date>('Date');
is.defined = (value: unknown): boolean => !is.undefined(value);
is.domElement = (value: unknown): value is HTMLElement => {
return (
is.object(value) &&
!is.plainObject(value) &&
(value as HTMLElement).nodeType === 1 &&
is.string((value as HTMLElement).nodeName) &&
DOM_PROPERTIES_TO_CHECK.every(property => property in (value as HTMLElement))
);
};
is.empty = (value: unknown): boolean => {
return (
(is.string(value) && value.length === 0) ||
(is.array(value) && value.length === 0) ||
(is.object(value) && !is.map(value) && !is.set(value) && Object.keys(value).length === 0) ||
(is.set(value) && value.size === 0) ||
(is.map(value) && value.size === 0)
);
};
is.error = isObjectOfType<Error>('Error');
is.function = isOfType<Function>('function');
is.generator = (value: unknown): value is Generator => {
return (
is.iterable(value) &&
is.function((value as IterableIterator<unknown>).next) &&
is.function((value as IterableIterator<unknown>).throw)
);
};
is.generatorFunction = isObjectOfType<GeneratorFunction>('GeneratorFunction');
is.instanceOf = <T>(instance: unknown, class_: Class<T>): instance is T => {
if (!instance || !(class_ as Class<T>)) {
return false;
}
return Object.getPrototypeOf(instance) === class_.prototype;
};
is.iterable = (value: unknown): value is IterableIterator<unknown> => {
return (
!is.nullOrUndefined(value) && is.function((value as IterableIterator<unknown>)[Symbol.iterator])
);
};
is.map = isObjectOfType<Map<unknown, unknown>>('Map');
is.nan = (value: unknown): boolean => {
return Number.isNaN(value as number);
};
is.null = (value: unknown): value is null => {
return value === null;
};
is.nullOrUndefined = (value: unknown): value is null | undefined => {
return is.null(value) || is.undefined(value);
};
is.number = (value: unknown): value is number => {
return isOfType<number>('number')(value) && !is.nan(value);
};
is.numericString = (value: unknown): value is string => {
return is.string(value) && (value as string).length > 0 && !Number.isNaN(Number(value));
};
is.object = (value: unknown): value is object => {
return !is.nullOrUndefined(value) && (is.function(value) || typeof value === 'object');
};
is.oneOf = (target: unknown[], value: any): boolean => {
if (!is.array(target)) {
return false;
}
// eslint-disable-next-line unicorn/prefer-includes
return target.indexOf(value) > -1;
};
is.plainFunction = isObjectOfType<Function>('Function');
is.plainObject = (value: unknown): value is PlainObject => {
if (getObjectType(value) !== 'Object') {
return false;
}
const prototype = Object.getPrototypeOf(value);
return prototype === null || prototype === Object.getPrototypeOf({});
};
is.primitive = (value: unknown): value is Primitive =>
is.null(value) || isPrimitiveType(typeof value);
is.promise = isObjectOfType<Promise<unknown>>('Promise');
is.propertyOf = (
target: PlainObject,
key: string,
predicate?: (v: unknown) => boolean,
): boolean => {
if (!is.object(target) || !key) {
return false;
}
const value = target[key];
if (is.function(predicate)) {
return predicate(value);
}
return is.defined(value);
};
is.regexp = isObjectOfType<RegExp>('RegExp');
is.set = isObjectOfType<Set<PlainObject>>('Set');
is.string = isOfType<string>('string');
is.symbol = isOfType<symbol>('symbol');
is.undefined = isOfType<undefined>('undefined');
is.weakMap = isObjectOfType<WeakMap<PlainObject, unknown>>('WeakMap');
is.weakSet = isObjectOfType<WeakSet<PlainObject>>('WeakSet');
export default is;