import { NgContract, FilterParam, TypedFilter } from "../../contract";
import { BigNumber, Overrides, CallOverrides, Signer, ContractTransaction, BigNumberish } from "ethers";
import { Provider } from "@ethersproject/providers";
import { NgZone } from "@angular/core";
import { ERC20Metadata } from "./types";
export interface BaseERC20Events {
    events: {
        Approval: (owner: string, spender: string, value: BigNumber) => void;
        Transfer: (from: string, to: string, value: BigNumber) => void;
    };
    filters: {
        Approval: (owner?: FilterParam<string>, spender?: FilterParam<string>) => TypedFilter<"Approval">;
        Transfer: (from?: FilterParam<string>, to?: FilterParam<string>) => TypedFilter<"Transfer">;
    };
    queries: {
        Approval: {
            owner: string;
            spender: string;
            value: BigNumber;
        };
        Transfer: {
            from: string;
            to: string;
            value: BigNumber;
        };
    };
}
export declare class ERC20 extends NgContract<BaseERC20Events> {
    private metadata?;
    allowance: (owner: string, spender: string, overrides?: CallOverrides) => Promise<BigNumber>;
    balanceOf: (account: string, overrides?: CallOverrides) => Promise<BigNumber>;
    decimals: (overrides?: CallOverrides) => Promise<number>;
    name: (overrides?: CallOverrides) => Promise<string>;
    symbol: (overrides?: CallOverrides) => Promise<string>;
    totalSupply: (overrides?: CallOverrides) => Promise<BigNumber>;
    approve: (spender: string, amount: BigNumberish, overrides?: Overrides) => Promise<ContractTransaction>;
    decreaseAllowance: (spender: string, subtractedValue: BigNumberish, overrides?: Overrides) => Promise<ContractTransaction>;
    increaseAllowance: (spender: string, addedValue: BigNumberish, overrides?: Overrides) => Promise<ContractTransaction>;
    transfer: (recipient: string, amount: BigNumberish, overrides?: Overrides) => Promise<ContractTransaction>;
    transferFrom: (sender: string, recipient: string, amount: BigNumberish, overrides?: Overrides) => Promise<ContractTransaction>;
    constructor(address: string, signer: Signer | Provider, ngZone: NgZone);
    exist(): Promise<boolean>;
    /** Listen on the changes of a balance of an address */
    balanceChanges(address: string): import("rxjs").Observable<BigNumber>;
    getMetadata(): Promise<ERC20Metadata>;
}
export declare const ERC20_abi: ({
    inputs: never[];
    stateMutability: string;
    type: string;
    anonymous?: undefined;
    name?: undefined;
    outputs?: undefined;
} | {
    anonymous: boolean;
    inputs: {
        indexed: boolean;
        internalType: string;
        name: string;
        type: string;
    }[];
    name: string;
    type: string;
    stateMutability?: undefined;
    outputs?: undefined;
} | {
    inputs: {
        internalType: string;
        name: string;
        type: string;
    }[];
    name: string;
    outputs: {
        internalType: string;
        name: string;
        type: string;
    }[];
    stateMutability: string;
    type: string;
    anonymous?: undefined;
})[];