diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..ad9c149
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,175 @@
+declare module 'launchdarkly-react-native-client-sdk' {
+  export type LDClientConfig = {
+    mobileKey: string;
+    baseUri?: string;
+    streamUri?: string;
+    eventsUri?: string;
+    eventsCapacity?: number;
+    eventsFlushIntervalMillis?: number;
+    connectionTimeoutMillis?: number;
+    pollingIntervalMillis?: number;
+    backgroundPollingIntervalMillis?: number;
+    useReport?: boolean;
+    stream?: boolean;
+    disableBackgroundUpdating?: boolean;
+    offline?: boolean;
+    debugMode?: boolean;
+  };
+
+  export type LDUserConfig = {
+    key: string;
+    name?: string;
+    firstName?: string;
+    lastName?: string;
+    email?: string;
+    anonymous?: boolean;
+    privateAttributeNames?: string[];
+    custom?: { [key: string]: any };
+  };
+
+  export enum ErrorKind {
+    // The client is not able to establish a connection to LaunchDarkly yet. If there is a persistent feature store, the store does not yet contain flag data.
+    CLIENT_NOT_READY = 'CLIENT_NOT_READY',
+    // The flag key did not match any known flag.
+    FLAG_NOT_FOUND = 'FLAG_NOT_FOUND',
+    // The user object or user key was not provided.
+    USER_NOT_SPECIFIED = 'USER_NOT_SPECIFIED',
+    // There was an internal inconsistency in the flag data. For example, a rule specified a nonexistent variation.
+    // This is an unusual condition that might require assistance from LaunchDarkly's Support team.
+    MALFORMED_FLAG = 'MALFORMED_FLAG',
+    // The application code requested the flag value with a different data type than it actually is. For example, the code asked for a boolean when the flag type is actually a string.
+    // This can only happen in strongly typed languages, such as Go, Java, and C#.
+    WRONG_TYPE = 'WRONG_TYPE',
+    //An unexpected error stopped flag evaluation. This could happen if you are using a persistent feature store and the database stops working.
+    //When this happens, the SDK always prints the specific error to the log.
+    EXCEPTION = 'EXCEPTION',
+  }
+
+  export enum ReasonKind {
+    // The flag is off and therefore returned its configured off value. This value appears on the dashboard next to "If targeting is off, serve:".
+    OFF = 'OFF',
+    // The flag is on, but the user did not match any targets or rules, so it returned the value that appears on the dashboard under "Default rule."
+    // The "default rule" is not the same thing as the default value discussed in "Error conditions".
+    FALLTHROUGH = 'FALLTHROUGH',
+    // The user key was specifically targeted for this flag in the "Target individual users" section.
+    TARGET_MATCH = 'TARGET_MATCH',
+    // The user who encountered the flag matched one of the flag's rules.
+    // In this case, the reason object also has these properties:
+    //   * ruleIndex : The positional index of the matched rule (0 for the first rule).
+    //   * ruleId: The rule's unique identifier, which stays the same even if you rearrange the order of the rules.
+    RULE_MATCH = 'RULE_MATCH',
+    // The flag had at least one prerequisite flag that either was off or did not return the desired variation. Because of this, the flag returned its "off" value.
+    // In this case, the reason object also has this property:
+    //   * prerequisiteKey : The key of the prerequisite flag that failed.
+    PREREQUISITE_FAILED = 'PREREQUISITE_FAILED',
+    // The flag could not be evaluated, so the default value was returned
+    ERROR = 'ERROR',
+  }
+
+  export type ReasonOff = {
+    kind: ReasonKind.OFF;
+  };
+
+  export type ReasonFallthrough = {
+    kind: ReasonKind.FALLTHROUGH;
+  };
+
+  export type ReasonTargetMatch = {
+    kind: ReasonKind.TARGET_MATCH;
+  };
+
+  export type ReasonRuleMatch = {
+    kind: ReasonKind.RULE_MATCH;
+    // The positional index of the matched rule (0 for the first rule).
+    ruleIndex: number;
+    // The rule's unique identifier, which stays the same even if you rearrange the order of the rules.
+    ruleId: string;
+  };
+
+  export type ReasonPrerequisiteFailed = {
+    kind: ReasonKind.PREREQUISITE_FAILED;
+    // The key of the prerequisite flag that failed.
+    prerequisiteKey: string;
+  };
+
+  export type ReasonError = {
+    kind: ReasonKind.ERROR;
+    errorKind: ErrorKind;
+  };
+
+  export type Reason =
+    | ReasonOff
+    | ReasonFallthrough
+    | ReasonTargetMatch
+    | ReasonRuleMatch
+    | ReasonPrerequisiteFailed
+    | ReasonError;
+
+  export type VariationDetail<T> = {
+    value: T;
+    variationIndex: number;
+    reason: Reason;
+  };
+
+  export default class LDClient<T> {
+    constructor();
+    configure(config: LDClientConfig, userConfig: LDUserConfig): any;
+    boolVariation(flagKey: string, fallback: boolean): Promise<boolean>;
+    intVariation(flagKey: string, fallback: number): Promise<number>;
+    floatVariation(flagKey: string, fallback: number): Promise<number>;
+    stringVariation(flagKey: string, fallback: string): Promise<string>;
+    jsonVariation(
+      flagKey: string,
+      fallback: Record<string, any>,
+    ): Promise<Record<string, any>>;
+    boolVariationDetail(
+      flagKey: string,
+      fallback: boolean,
+    ): Promise<VariationDetail<boolean> | boolean>;
+    intVariationDetail(
+      flagKey: string,
+      fallback: number,
+    ): Promise<VariationDetail<number> | number>;
+    floatVariationDetail(
+      flagKey: string,
+      fallback: number,
+    ): Promise<VariationDetail<number> | number>;
+    stringVariationDetail(
+      flagKey: string,
+      fallback: string,
+    ): Promise<VariationDetail<string> | string>;
+    jsonVariationDetail(
+      flagKey: string,
+      fallback: Record<string, any>,
+    ): Promise<VariationDetail<Record<string, any>> | Record<string, any>>;
+    allFlags(): Promise<T>;
+    track(eventName: string, data: any, metricValue: number): void;
+    setOffline(): Promise<boolean>;
+    isOffline(): Promise<boolean>;
+    setOnline(): Promise<boolean>;
+    isInitialized(): Promise<boolean>;
+    flush(): void;
+    close(): void;
+    identify(userConfig: LDUserConfig): Promise<null>;
+    isDisableBackgroundPolling(): Promise<boolean>;
+    registerFeatureFlagListener(
+      flagKey: string,
+      callback: (flagKey: string) => void,
+    ): void;
+    unregisterFeatureFlagListener(
+      flagKey: string,
+      callback: (flagKey: string) => void,
+    ): void;
+    getConnectionInformation(): any;
+    registerCurrentConnectionModeListener(
+      listenerId: string,
+      callback: (connectionMode: string) => void,
+    ): void;
+    unregisterCurrentConnectionModeListener(listenerId: string): void;
+    registerAllFlagsListener(
+      listenerId: string,
+      callback: (updatedFlags: string[]) => void,
+    ): void;
+    unregisterAllFlagsListener(listenerId: string): void;
+  }
+}
diff --git a/package.json b/package.json
index 45dd30c..d7bfa0d 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "2.1.0",
   "description": "",
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },