@metamask/inpage-provider draft types

mm-inpage-provider.d.ts

export type SerializableValue = string | number | null | undefined;
export type EthereumParameterValue = SerializableValue | Record<string, SerializableValue>;
export interface RequestArguments {
    method: string;
    params?: EthereumParameterValue[];
}
export interface ProviderConnectInfo {
    chainId: string;
}
export interface ProviderRpcError extends Error {
    message: string;
    code: number;
    data?: any;
}
export interface ProviderMessage {
    type: string;
    data: any;
}
export interface EIP1193 {
    request(args: RequestArguments): Promise<EthereumParameterValue | EthereumParameterValue[]>;
    on<RT>(eventType: 'message', listener: (message: ProviderMessage) => void): RT;
    on<RT>(eventType: 'accountsChanged', listener: (accounts: string[]) => void): RT;
    on<RT>(eventType: 'chainChanged', listener: (chainId: string) => void): RT;
    on<RT>(eventType: 'disconnect', listener: (error: ProviderRpcError) => void): RT;
    on<RT>(eventType: 'connect', listener: (connectInfo: ProviderConnectInfo) => void): RT;
    on<RT>(eventType: string, listener: () => void): RT;
}