Inspect JS

Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

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Is this an ES6 Symbol value?

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Is this an arguments object? It's a harder question than you think.

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Is this specifier a node.js core module?

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Determine if the JS environment has Symbol support. Supports spec, or shams.

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Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.

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Returns true if a value has the characteristics of a valid JavaScript data descriptor.

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