Store Options

You can provide an NgxsModuleOptions object as the second argument of your NgxsModule.forRoot call. The following options are available:

• developmentMode - Setting this to true will add additional debugging features that are useful for development time. This includes freezing your state and actions to guarantee immutability. (Default value is false). It makes sense to use it only during development to ensure there're no state mutations. When building for production, the Object.freeze will be tree-shaken away.

• selectorOptions - A nested options object for providing a global options setting to be used for selectors. This can be overridden at the class or specific selector method level using the SelectorOptions decorator. The following options are available:

  • suppressErrors - Setting this to true will cause any error within a selector to result in the selector returning undefined. Setting this to false results in these errors propagating through the stack that triggered the evaluation of the selector that caused the error. (Default value is false).

  • injectContainerState - Setting this to true will inject the container state model as the first parameter of a selector method (defined within a state class) that joins to other selectors for its parameters. Note: This property should not be explicitly set by anyone using NGXS v4; it only existed for migrating codebases from v3 to v4.

• compatibility - A nested options object that allows for the following compatibility options:

  • strictContentSecurityPolicy - Set this to true in order to enable support for pages where a Strict Content Security Policy has been enabled. This setting circumvent some optimisations that violate a strict CSP through the use of new Function(...). (Default value is false)

• executionStrategy (❗) - An advanced option that is used to gain specific control over the way that NGXS executes code that is considered to be inside the NGXS context (ie. within @Action handlers) and the context under which the NGXS behaviours are observed (outside the NGXS context). These observable behaviours are: store.selectSignal(...), store.select(...), actions.subscribe(...) or store.dispatch(...).subscribe(...). The NoopNgxsExecutionStrategy should be used alongside provideZonelessChangeDetection, a feature available starting from Angular v17. This feature offers a zoneless change detection scheduler, making zone.js optional. Due to practical considerations and the insights gained from existing implementations of the executionStrategy option, developers may find little motivation to create their own execution strategy. Understanding its purpose can be complex, which further discourages developers from undertaking this task. If you choose to implement your own strategy, you can provide an Angular service class that implements the NgxsExecutionStrategy interface. The default value of null will result the default strategy being used. This default strategy runs NGXS operations outside Angular's zone but all observable behaviours of NGXS are run back inside Angular's zone. (The default value is null).

ngxs.config.ts:

import { NgxsModuleOptions } from '@ngxs/store';

export const ngxsConfig: NgxsModuleOptions = {
  developmentMode: !environment.production,
  selectorOptions: {
    suppressErrors: false
  },
  compatibility: {
    strictContentSecurityPolicy: true
  },
  // Execution strategy overridden for illustrative purposes
  // (only do this if you know what you are doing)
  executionStrategy: NoopNgxsExecutionStrategy
};

app.config.ts:

import { provideStore } from '@ngxs/store';

import { ngxsConfig } from './ngxs.config';
...
export const appConfig: ApplicationConfig = {
  providers: [
    provideStore(states, ngxsConfig)
  ]
};