jsmodern/dist/weak-map/from.js

An extension to existing JavaScript, influenced by other great languages such as Rust, Dart, Java, Golang, etc.

export const from = {
    isStatic: true,
    label: 'from',
    fn: function weakMapFrom(mapEntries, mapFn) {
        if (!Array.isArray(mapEntries)) {
            throw new TypeError(`Invalid WeakMap entries. Each WeakMap entry must contain [key, value] where key must be an object`);
        }
        try {
            const entries = 'function' === typeof (mapFn) ? mapEntries.map(mapFn) : mapEntries;
            return new WeakMap(entries);
        }
        catch (_) {
            throw new TypeError(`WeakMap key must be an object`);
        }
    },
};
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