Next.jsでpino-prettyを使う

instrumentationHook は先んじて next.config.mjs で有効にしておく

instrumentation.ts

export const register = async () => {
  if (process.env.NEXT_RUNTIME === "nodejs") {
    /* eslint-disable @typescript-eslint/no-require-imports */
    await require("pino");
    await require("next-logger");
  }
};

本番ではpino-prettyは有効にしない

next-logger.config.js

const pino = require("pino");

module.exports = {
  logger: (defaultConfig) => {
    const opts =
      process.env.NODE_ENV === "production"
        ? {}
        : {
            transport: {
              target: "pino-pretty",
              options: {
                colorized: true,
              },
            },
          };

    return pino({
      ...defaultConfig,
      ...opts,
    });
  },
};