@bemedev/core/lib/features/functions/castings.js

The core library of @bemedev

import { _unknown } from '../../globals/utils/_unknown.js';
import { castFn } from '../../globals/utils/castFn.js';
import { expandFn } from '../../globals/utils/expandFn.js';
import { identity } from '../../globals/utils/identity.js';

const castings = castFn()({
    is: expandFn((value) => {
        return typeof value === 'function';
    }, {
        strict: (fn) => {
            return (value) => typeof value === 'function' && fn(value);
        },
    }),
    forceCast: (value) => {
        return _unknown(value);
    },
    dynamic: (..._) => identity,
    checker: castFn()({
        /**
         * Very low
         * Checks if value is a function with one argument
         * @param value value to check
         * @returns true if value is a function with one argument
         */
        is: (value) => {
            return (typeof value === 'function' &&
                value.length === 1 &&
                !/^\s*class\s+/.test(value.toString()));
        },
        byType: expandFn((checker) => checker, {
            forceCast: (value) => _unknown(value),
        }),
    }),
});

export { castings };
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