ngrx-store-freeze/es6/src/index.js

@ngrx/store meta reducer that prevents state from being mutated.

var deepFreeze = require('deep-freeze-strict');
export function storeFreeze(reducer) {
    return function freeze(state, action) {
        state = state || {};
        deepFreeze(state);
        // guard against trying to freeze null or undefined types
        if (action.payload) {
            deepFreeze(action.payload);
        }
        var nextState = reducer(state, action);
        deepFreeze(nextState);
        return nextState;
    };
}
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