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index.js
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index.js
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'use strict';
var hasOwn = require('hasown');
var hasPropertyDescriptors = require('has-property-descriptors');
var isArray = require('isarray');
var functionsHaveConfigurableNames = require('functions-have-names').functionsHaveConfigurableNames();
var gOPD = require('gopd');
var defineDataProperty = require('define-data-property');
var hasDescriptors = hasPropertyDescriptors();
var $defineProperty = hasDescriptors && Object.defineProperty;
var hasArrayLengthDefineBug = hasPropertyDescriptors.hasArrayLengthDefineBug();
var $TypeError = TypeError;
var $SyntaxError = SyntaxError;
module.exports = function mockProperty(obj, prop, options) {
if (hasOwn(options, 'nonEnumerable') && typeof options.nonEnumerable !== 'boolean') {
throw new $TypeError('`nonEnumerable` option, when present, must be a boolean');
}
if (hasOwn(options, 'nonWritable') && typeof options.nonWritable !== 'boolean') {
throw new $TypeError('`nonEnumerable` option, when present, must be a boolean');
}
if (hasOwn(options, 'delete') && typeof options['delete'] !== 'boolean') {
throw new $TypeError('`delete` option, when present, must be a boolean');
}
var wantsData = hasOwn(options, 'value') || hasOwn(options, 'nonWritable');
var wantsAccessor = hasOwn(options, 'get') || hasOwn(options, 'set');
if (options['delete'] && (wantsData || wantsAccessor || hasOwn(options, 'nonEnumerable'))) {
throw new $TypeError('`delete` option must not be set to true when any of `value`, `get`, `set`, `nonWritable`, or `nonEnumerable` are provided');
}
if (wantsAccessor) {
if (wantsData) {
throw new $TypeError('`value` and `nonWritable` options are mutually exclusive with `get`/`set` options');
}
if (
(hasOwn(options, 'get') && typeof options.get !== 'function' && typeof options.get !== 'undefined')
|| (hasOwn(options, 'set') && typeof options.set !== 'function' && typeof options.set !== 'undefined')
) {
throw new $TypeError('`get` and `set` options, when present, must be functions or `undefined`');
}
if (!gOPD || !$defineProperty) {
throw new $SyntaxError('the `get`/`set` options require native getter/setter support');
}
}
var objIsArray = isArray(obj);
var origDescriptor = gOPD
? gOPD(obj, prop)
: hasOwn(obj, prop)
? {
configurable: typeof obj === 'function' && prop === 'name' ? functionsHaveConfigurableNames : true,
enumerable: !(hasDescriptors && objIsArray && prop === 'length'),
value: obj[prop],
writable: true
}
: void undefined;
var origConfigurable = origDescriptor ? origDescriptor.configurable : true;
var origEnumerable = origDescriptor ? origDescriptor.enumerable : true;
if (wantsAccessor) {
var hasGetter = origDescriptor && typeof origDescriptor.get === 'function';
var hasSetter = origDescriptor && typeof origDescriptor.set === 'function';
var hasFutureGetter = hasOwn(options, 'get') ? typeof options.get === 'function' : hasGetter;
var hasFutureSetter = hasOwn(options, 'set') ? typeof options.set === 'function' : hasSetter;
if (!hasFutureGetter && !hasFutureSetter) {
throw new $TypeError('when the `get` or `set` options are provided, the mocked object property must end up with at least one of a getter or a setter function');
}
}
var isChangingEnumerability = hasOwn(options, 'nonEnumerable') ? !options.nonEnumerable !== origEnumerable : false;
if (origDescriptor && !origDescriptor.configurable) {
if (isChangingEnumerability) {
throw new $TypeError('`' + prop + '` is nonconfigurable, and can not be changed');
}
if (wantsAccessor) {
if (hasOwn(origDescriptor, 'value')) {
throw new $TypeError('`' + prop + '` is a nonconfigurable data property, and can not be changed to an accessor');
}
var isChangingGetter = hasOwn(options, 'get') && hasOwn(origDescriptor, 'get') && options.get !== origDescriptor.get;
var isChangingSetter = hasOwn(options, 'set') && hasOwn(origDescriptor, 'set') && options.set !== origDescriptor.set;
if (isChangingGetter || isChangingSetter) {
throw new $TypeError('`' + prop + '` is nonconfigurable, and can not be changed');
}
return function restore() {};
}
if (hasOwn(origDescriptor, 'get') || hasOwn(origDescriptor, 'set')) {
throw new $TypeError('`' + prop + '` is a nonconfigurable accessor property, and can not be changed to a data property');
}
var isChangingValue = hasOwn(options, 'value') && hasOwn(origDescriptor, 'value') && options.value !== origDescriptor.value;
var isChangingWriteability = hasOwn(options, 'nonWritable') && !options.nonWritable !== origDescriptor.writable;
if ((!origDescriptor.writable && isChangingValue) || isChangingEnumerability || isChangingWriteability) {
throw new $TypeError('`' + prop + '` is nonconfigurable, and can not be changed');
}
if (!isChangingWriteability && !isChangingValue) {
return function restore() {};
}
}
if (options['delete']) {
delete obj[prop]; // eslint-disable-line no-param-reassign
} else if (
wantsData
&& !isChangingEnumerability
&& (!origDescriptor || origDescriptor.enumerable)
&& (!hasOwn(options, 'nonWritable') || !options.nonWritable)
&& (!origDescriptor || origDescriptor.writable)
&& (!gOPD || !(prop in obj))
) {
obj[prop] = options.value; // eslint-disable-line no-param-reassign
} else {
if (objIsArray && prop === 'length' && hasArrayLengthDefineBug) {
throw new $SyntaxError('this environment does not support Define on an array’s length');
}
var newEnumerable = hasOwn(options, 'nonEnumerable') ? !options.nonEnumerable : origEnumerable;
if (wantsData) {
defineDataProperty(
obj,
prop,
hasOwn(options, 'value') ? options.value : origDescriptor.value,
!newEnumerable,
hasOwn(options, 'nonWritable') ? options.nonWritable : hasOwn(origDescriptor, 'writable') ? !origDescriptor.writable : false
);
} else if (wantsAccessor) {
var getter = hasOwn(options, 'get') ? options.get : origDescriptor && origDescriptor.get;
var setter = hasOwn(options, 'set') ? options.set : origDescriptor && origDescriptor.set;
$defineProperty(obj, prop, {
configurable: origConfigurable,
enumerable: newEnumerable,
get: getter,
set: setter
});
} else {
defineDataProperty(
obj,
prop,
origDescriptor.value,
!newEnumerable
);
}
}
return function restore() {
if (!origDescriptor) {
delete obj[prop]; // eslint-disable-line no-param-reassign
} else if ($defineProperty) {
if (hasOwn(origDescriptor, 'writable')) {
defineDataProperty(
obj,
prop,
origDescriptor.value,
!origDescriptor.enumerable,
!origDescriptor.writable,
!origDescriptor.configurable
);
} else {
var oldGetter = origDescriptor && origDescriptor.get;
var oldSetter = origDescriptor && origDescriptor.set;
$defineProperty(obj, prop, {
configurable: origDescriptor.configurable,
enumerable: origDescriptor.enumerable,
get: oldGetter,
set: oldSetter
});
}
} else {
obj[prop] = origDescriptor.value; // eslint-disable-line no-param-reassign
}
};
};