react-native-logs/src/transports/consoleTransport.ts

Performance-aware simple logger for React-Native with namespaces, custom levels and custom transports (colored console, file writing, etc.)

import { transportFunctionType } from "../index";

const availableColors = {
  default: null,
  black: 30,
  red: 31,
  green: 32,
  yellow: 33,
  blue: 34,
  magenta: 35,
  cyan: 36,
  white: 37,
  grey: 90,
  redBright: 91,
  greenBright: 92,
  yellowBright: 93,
  blueBright: 94,
  magentaBright: 95,
  cyanBright: 96,
  whiteBright: 97,
} as const;

const resetColors = "\x1b[0m";

type Color = keyof typeof availableColors;

export type ConsoleTransportOptions = {
  colors?: Record<string, Color>;
  extensionColors?: Record<string, Color>;
  consoleFunc?: (msg: string) => void;
};

const consoleTransport: transportFunctionType<ConsoleTransportOptions> = (
  props
) => {
  if (!props) return false;

  let msg = props.msg;
  let color;

  if (
    props.options?.colors &&
    props.options.colors[props.level.text] &&
    availableColors[props.options.colors[props.level.text]]
  ) {
    color = `\x1b[${availableColors[props.options.colors[props.level.text]]}m`;
    msg = `${color}${msg}${resetColors}`;
  }

  if (props.extension && props.options?.extensionColors) {
    let extensionColor = "\x1b[7m";

    const extColor = props.options.extensionColors[props.extension];
    if (extColor && availableColors[extColor]) {
      extensionColor = `\x1b[${availableColors[extColor] + 10}m`;
    }

    let extStart = color ? resetColors + extensionColor : extensionColor;
    let extEnd = color ? resetColors + color : resetColors;
    msg = msg.replace(
      props.extension,
      `${extStart} ${props.extension} ${extEnd}`
    );
  }

  if (props.options?.consoleFunc) {
    props.options.consoleFunc(msg.trim());
  } else {
    console.log(msg.trim());
  }

  return true;
};

export { consoleTransport };