/
reviver.js
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reviver.js
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'use strict';
// MODULES //
var getKeys = require( 'object-keys' ).shim();
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var ctors = require( './ctors.js' );
// MAIN //
/**
* Revives a JSON-serialized error object.
*
* @param {string} key - key
* @param {*} value - value
* @returns {(*|Error|SyntaxError|URIError|EvalError|ReferenceError|RangeError|TypeError)} value or error object
*
* @example
* var str = '{"type":"TypeError","message":"beep"}';
* var err = JSON.parse( str, reviver );
* // returns <TypeError>
*/
function reviver( key, value ) {
var hasStack;
var ctor;
var keys;
var err;
var k;
var i;
if (
value &&
value.type &&
isString( value.message )
) {
ctor = ctors[ value.type ];
if ( ctor ) {
err = new ctor( value.message );
keys = getKeys( value );
for ( i = 0; i < keys.length; i++ ) {
k = keys[ i ];
if (
k === 'type' ||
k === 'message' ||
k === 'name' // read-only for built-ins
) {
continue;
}
if ( k === 'stack' ) {
if ( !isString( value[k] ) ) {
continue;
}
hasStack = true;
}
err[ k ] = value[ k ];
}
if ( !hasStack && isString( err.stack ) ) {
err.stack = '';
}
return err;
}
}
return value;
} // end FUNCTION reviver()
// EXPORTS //
module.exports = reviver;