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Contains the shared classes and interfaces used to configure the libraries. These bases classes are expanded on in dependent libraries with the core configuration defined here. This module exposes an instance of the RuntimeConfigImpl class: RuntimeConfig. This configuration object can be referenced and contains the global configuration shared across the libraries. You can also extend the configuration for use within your own applications.

ILibraryConfiguration Interface

Defines the shared configurable values used across the library as shown below. Each of these has a default value as shown below

export interface ILibraryConfiguration {

     * Allows caching to be global disabled, default: false
    globalCacheDisable?: boolean;

     * Defines the default store used by the usingCaching method, default: session
    defaultCachingStore?: "session" | "local";

     * Defines the default timeout in seconds used by the usingCaching method, default 30
    defaultCachingTimeoutSeconds?: number;

     * If true a timeout expired items will be removed from the cache in intervals determined by cacheTimeoutInterval
    enableCacheExpiration?: boolean;

     * Determines the interval in milliseconds at which the cache is checked to see if items have expired (min: 100)
    cacheExpirationIntervalMilliseconds?: number;

     * Used to supply the current context from an SPFx webpart to the library
    spfxContext?: any;


The class which implements the runtime configuration management as well as sets the default values used within the library. At its heart lies a Dictionary used to track the configuration values. The keys will match the values in the interface or plain object passed to the extend method.


The assign method is used to add configuration to the global configuration instance. You can pass it any plain object with string keys and those values will be added. Any existing values will be overwritten based on the keys. Last value in wins. For a more detailed scenario of using the RuntimeConfig instance in your own application please see the section below "Using RuntimeConfig within your application". Note there are no methods to remove/clear the global config as it should be considered fairly static as frequent updates may have unpredictable side effects as it is a global shared object. Generally it should be set at the start of your application.

import { RuntimeConfig } from "@pnp/core";

// add your custom keys to the global configuration
// note you can use object hashes as values
   "myKey1": "value 1",
   "myKey2": {
       "subKey": "sub value 1",
       "subKey2": "sub value 2",

// read your custom values
const v = RuntimeConfig.get("myKey1"); // "value 1"

Using RuntimeConfig within your Application

If you have a set of properties you will access very frequently it may be desirable to implement your own configuration object and expose those values as properties. To do so you will need to create an interface for your configuration (optional) and a wrapper class for RuntimeConfig to expose your properties

import { ILibraryConfiguration, RuntimeConfig, ITypedHash } from "@pnp/core";

// first we create our own interface by extending LibraryConfiguration. This allows your class to accept all the values with correct type checking. Note, because
// TypeScript allows you to extend from multiple interfaces you can build a complex configuration definition from many sub definitions.

// create the interface of your properties
// by creating this separately you allows others to compose your parts into their own config
interface MyConfigurationPart {

    // you can create a grouped definition and access your settings as an object
    // keys can be optional or required as defined by your interface
    my?: {
        prop1?: string;
        prop2?: string;

    // and/or define multiple top level properties (beware key collision)
    // it is good practice to use a unique prefix
    myProp1: string;
    myProp2: number;

// now create a combined interface
interface MyConfiguration extends ILibraryConfiguration, MyConfigurationPart { }

// now create a wrapper object and expose your properties
class MyRuntimeConfigImpl {

    // exposing a nested property
    public get prop1(): ITypedHash<string> {

        const myPart = RuntimeConfig.get("my");
        if (myPart !== null && typeof myPart !== "undefined" && typeof myPart.prop1 !== "undefined") {
            return myPart.prop1;

        return {};

    // exposing a root level property
    public get myProp1(): string | null {

        let myProp1 = RuntimeConfig.get("myProp1");

        if (myProp1 === null) {
            myProp1 = "some default value";

        return myProp1;

    setup(config: MyConfiguration): void {

// create a single static instance of your impl class
export let MyRuntimeConfig = new MyRuntimeConfigImpl();

Now in other files you can use and set your configuration with a typed interface and properties

import { MyRuntimeConfig } from "{location of module}";

    my: {
        prop1: "hello",

const value = MyRuntimeConfig.myProp1; // "hello"