18 lines
597 B
JavaScript
18 lines
597 B
JavaScript
export function isBuiltinWithMutableMethods(value) {
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return value instanceof Date
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|| value instanceof Set
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|| value instanceof Map
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|| value instanceof WeakSet
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|| value instanceof WeakMap
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|| ArrayBuffer.isView(value);
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}
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export function isBuiltinWithoutMutableMethods(value) {
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// Primitives and null → true. Functions → false. RegExp → true.
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return value === null
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|| (typeof value !== 'object' && typeof value !== 'function')
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|| value instanceof RegExp
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|| value instanceof ArrayBuffer
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|| (typeof SharedArrayBuffer !== 'undefined' && value instanceof SharedArrayBuffer);
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}
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