@findeth/abi/lib/es/parsers/function.js

A tiny Solidity ABI encoder and decoder

import { concat, fromHex, toHex } from '../utils';
import { fixedBytes } from './fixed-bytes';
export const getFunction = input => {
  if (typeof input === 'string') {
    return fromHex(input);
  }

  return concat([fromHex(input.address), fromHex(input.selector)]);
};
export const fn = {
  isDynamic: false,

  encode({
    buffer,
    value
  }) {
    const fn = getFunction(value);
    return fixedBytes.encode({
      type: 'bytes24',
      buffer,
      value: fn
    });
  },

  decode({
    value
  }) {
    return {
      address: `0x${toHex(value.slice(0, 20))}`,
      selector: toHex(value.slice(20, 24))
    };
  }

};
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