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: / var / canvas / node_modules / immutability-helper /
Filename : index.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function stringifiable(obj) {
    // Safely stringify Object.create(null)
    /* istanbul ignore next */
    return typeof obj === 'object' && !('toString' in obj) ?
        Object.prototype.toString.call(obj).slice(8, -1) :
        obj;
}
var isProduction = typeof process === 'object' && process.env.NODE_ENV === 'production';
function invariant(condition, message) {
    if (!condition) {
        /* istanbul ignore next */
        if (isProduction) {
            throw new Error('Invariant failed');
        }
        throw new Error(message());
    }
}
exports.invariant = invariant;
var hasOwnProperty = Object.prototype.hasOwnProperty;
var splice = Array.prototype.splice;
var toString = Object.prototype.toString;
function type(obj) {
    return toString.call(obj).slice(8, -1);
}
var assign = Object.assign || /* istanbul ignore next */ (function (target, source) {
    getAllKeys(source).forEach(function (key) {
        if (hasOwnProperty.call(source, key)) {
            target[key] = source[key];
        }
    });
    return target;
});
var getAllKeys = typeof Object.getOwnPropertySymbols === 'function'
    ? function (obj) { return Object.keys(obj).concat(Object.getOwnPropertySymbols(obj)); }
    /* istanbul ignore next */
    : function (obj) { return Object.keys(obj); };
function copy(object) {
    return Array.isArray(object)
        ? assign(object.constructor(object.length), object)
        : (type(object) === 'Map')
            ? new Map(object)
            : (type(object) === 'Set')
                ? new Set(object)
                : (object && typeof object === 'object')
                    ? assign(Object.create(Object.getPrototypeOf(object)), object)
                    /* istanbul ignore next */
                    : object;
}
var Context = /** @class */ (function () {
    function Context() {
        this.commands = assign({}, defaultCommands);
        this.update = this.update.bind(this);
        // Deprecated: update.extend, update.isEquals and update.newContext
        this.update.extend = this.extend = this.extend.bind(this);
        this.update.isEquals = function (x, y) { return x === y; };
        this.update.newContext = function () { return new Context().update; };
    }
    Object.defineProperty(Context.prototype, "isEquals", {
        get: function () {
            return this.update.isEquals;
        },
        set: function (value) {
            this.update.isEquals = value;
        },
        enumerable: true,
        configurable: true
    });
    Context.prototype.extend = function (directive, fn) {
        this.commands[directive] = fn;
    };
    Context.prototype.update = function (object, $spec) {
        var _this = this;
        var spec = (typeof $spec === 'function') ? { $apply: $spec } : $spec;
        if (!(Array.isArray(object) && Array.isArray(spec))) {
            invariant(!Array.isArray(spec), function () { return "update(): You provided an invalid spec to update(). The spec may " +
                "not contain an array except as the value of $set, $push, $unshift, " +
                "$splice or any custom command allowing an array value."; });
        }
        invariant(typeof spec === 'object' && spec !== null, function () { return "update(): You provided an invalid spec to update(). The spec and " +
            "every included key path must be plain objects containing one of the " +
            ("following commands: " + Object.keys(_this.commands).join(', ') + "."); });
        var nextObject = object;
        getAllKeys(spec).forEach(function (key) {
            if (hasOwnProperty.call(_this.commands, key)) {
                var objectWasNextObject = object === nextObject;
                nextObject = _this.commands[key](spec[key], nextObject, spec, object);
                if (objectWasNextObject && _this.isEquals(nextObject, object)) {
                    nextObject = object;
                }
            }
            else {
                var nextValueForKey = type(object) === 'Map'
                    ? _this.update(object.get(key), spec[key])
                    : _this.update(object[key], spec[key]);
                var nextObjectValue = type(nextObject) === 'Map'
                    ? nextObject.get(key)
                    : nextObject[key];
                if (!_this.isEquals(nextValueForKey, nextObjectValue)
                    || typeof nextValueForKey === 'undefined'
                        && !hasOwnProperty.call(object, key)) {
                    if (nextObject === object) {
                        nextObject = copy(object);
                    }
                    if (type(nextObject) === 'Map') {
                        nextObject.set(key, nextValueForKey);
                    }
                    else {
                        nextObject[key] = nextValueForKey;
                    }
                }
            }
        });
        return nextObject;
    };
    return Context;
}());
exports.Context = Context;
var defaultCommands = {
    $push: function (value, nextObject, spec) {
        invariantPushAndUnshift(nextObject, spec, '$push');
        return value.length ? nextObject.concat(value) : nextObject;
    },
    $unshift: function (value, nextObject, spec) {
        invariantPushAndUnshift(nextObject, spec, '$unshift');
        return value.length ? value.concat(nextObject) : nextObject;
    },
    $splice: function (value, nextObject, spec, originalObject) {
        invariantSplices(nextObject, spec);
        value.forEach(function (args) {
            invariantSplice(args);
            if (nextObject === originalObject && args.length) {
                nextObject = copy(originalObject);
            }
            splice.apply(nextObject, args);
        });
        return nextObject;
    },
    $set: function (value, _nextObject, spec) {
        invariantSet(spec);
        return value;
    },
    $toggle: function (targets, nextObject) {
        invariantSpecArray(targets, '$toggle');
        var nextObjectCopy = targets.length ? copy(nextObject) : nextObject;
        targets.forEach(function (target) {
            nextObjectCopy[target] = !nextObject[target];
        });
        return nextObjectCopy;
    },
    $unset: function (value, nextObject, _spec, originalObject) {
        invariantSpecArray(value, '$unset');
        value.forEach(function (key) {
            if (Object.hasOwnProperty.call(nextObject, key)) {
                if (nextObject === originalObject) {
                    nextObject = copy(originalObject);
                }
                delete nextObject[key];
            }
        });
        return nextObject;
    },
    $add: function (values, nextObject, _spec, originalObject) {
        invariantMapOrSet(nextObject, '$add');
        invariantSpecArray(values, '$add');
        if (type(nextObject) === 'Map') {
            values.forEach(function (_a) {
                var key = _a[0], value = _a[1];
                if (nextObject === originalObject && nextObject.get(key) !== value) {
                    nextObject = copy(originalObject);
                }
                nextObject.set(key, value);
            });
        }
        else {
            values.forEach(function (value) {
                if (nextObject === originalObject && !nextObject.has(value)) {
                    nextObject = copy(originalObject);
                }
                nextObject.add(value);
            });
        }
        return nextObject;
    },
    $remove: function (value, nextObject, _spec, originalObject) {
        invariantMapOrSet(nextObject, '$remove');
        invariantSpecArray(value, '$remove');
        value.forEach(function (key) {
            if (nextObject === originalObject && nextObject.has(key)) {
                nextObject = copy(originalObject);
            }
            nextObject.delete(key);
        });
        return nextObject;
    },
    $merge: function (value, nextObject, _spec, originalObject) {
        invariantMerge(nextObject, value);
        getAllKeys(value).forEach(function (key) {
            if (value[key] !== nextObject[key]) {
                if (nextObject === originalObject) {
                    nextObject = copy(originalObject);
                }
                nextObject[key] = value[key];
            }
        });
        return nextObject;
    },
    $apply: function (value, original) {
        invariantApply(value);
        return value(original);
    },
};
var defaultContext = new Context();
exports.isEquals = defaultContext.update.isEquals;
exports.extend = defaultContext.extend;
exports.default = defaultContext.update;
// @ts-ignore
exports.default.default = module.exports = assign(exports.default, exports);
// invariants
function invariantPushAndUnshift(value, spec, command) {
    invariant(Array.isArray(value), function () { return "update(): expected target of " + stringifiable(command) + " to be an array; got " + stringifiable(value) + "."; });
    invariantSpecArray(spec[command], command);
}
function invariantSpecArray(spec, command) {
    invariant(Array.isArray(spec), function () { return "update(): expected spec of " + stringifiable(command) + " to be an array; got " + stringifiable(spec) + ". " +
        "Did you forget to wrap your parameter in an array?"; });
}
function invariantSplices(value, spec) {
    invariant(Array.isArray(value), function () { return "Expected $splice target to be an array; got " + stringifiable(value); });
    invariantSplice(spec.$splice);
}
function invariantSplice(value) {
    invariant(Array.isArray(value), function () { return "update(): expected spec of $splice to be an array of arrays; got " + stringifiable(value) + ". " +
        "Did you forget to wrap your parameters in an array?"; });
}
function invariantApply(fn) {
    invariant(typeof fn === 'function', function () { return "update(): expected spec of $apply to be a function; got " + stringifiable(fn) + "."; });
}
function invariantSet(spec) {
    invariant(Object.keys(spec).length === 1, function () { return "Cannot have more than one key in an object with $set"; });
}
function invariantMerge(target, specValue) {
    invariant(specValue && typeof specValue === 'object', function () { return "update(): $merge expects a spec of type 'object'; got " + stringifiable(specValue); });
    invariant(target && typeof target === 'object', function () { return "update(): $merge expects a target of type 'object'; got " + stringifiable(target); });
}
function invariantMapOrSet(target, command) {
    var typeOfTarget = type(target);
    invariant(typeOfTarget === 'Map' || typeOfTarget === 'Set', function () { return "update(): " + stringifiable(command) + " expects a target of type Set or Map; got " + stringifiable(typeOfTarget); });
}