react-on-rails/lib/isThenable.js

react-on-rails JavaScript for react_on_rails Ruby gem

/* eslint-disable import/prefer-default-export -- named export for grep-ability and consistency with other @internal helpers */
/**
 * Narrows an unknown value to a thenable (has a callable `.then`) without assuming a native
 * Promise. Shared by the core ClientRenderer, rootErrorHandlers, and the Pro ClientSideRenderer
 * (via `react-on-rails/@internal/isThenable`) so non-native thenables are handled identically
 * everywhere.
 */
export function isThenable(value) {
    return (value != null &&
        (typeof value === 'object' || typeof value === 'function') &&
        typeof value.then === 'function');
}
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