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Generic setup instructions

Follow these instructions if your project doesn't use one of the other specific frameworks listed.

Install the CodeSee package in your JavaScript or TypeScript app

In the terminal, run the install command for your package manager:

npm install --save-dev @codesee/[email protected] @codesee/[email protected]
yarn add --dev @codesee/[email protected] @codesee/[email protected]

Configure your project

  1. If you don't have Babel compilation set up in your app, you need to add it. Use Babel's excellent guide for getting set up in your environment.
  2. Once you've added your Babel setup, add the codesee plugin for development. For example, if you have a .babelrc file, add the following to the env -> development part of your config (env goes at the top level):
  "env": {
    "development": {
      "plugins": [
        ["@codesee/instrument", { "hosted": true }],
        /* ... other dev plugins ... */

If your project doesn’t include a Babel config file (for example, .babelrc or babel.config.js), you may have a Babel configuration in your webpack.config.js file that you can add the ["@codesee/instrument", { "hosted": true }] to. Look for an options block where your Babel settings, presets, and plugins are declared. Add ["@codesee/instrument", { "hosted": true }] to the list of your project's plugins as in the example below:

   options: {
      presets: [
        //your project's babel presets go here
      plugins: [
        ["@codesee/instrument", { "hosted": true }],
        //other babel plugins go here

Optional: configuration for large or high data applications

verbose: boolean

By default, CodeSee instruments your code in order to record the data value of every expression. This always results in the application running slower while recording, and in rare circumstances, it can cause a noticeable slow down even when not recording. If this slowdown is happening in your application, you can configure CodeSee to use verbose: false (or terse) mode. CodeSee will instrument your code less and capture less data (just the inputs and outputs of functions), but continue to provide the same tracing, side effects, and visualizations as always.

  • Verbose mode (default): gets all of the runtime data but in some applications or recordings can cause a noticeable slowdown.
  • Terse mode: captures less runtime data, but your recordings will be more performant. If you have a high data application, or are noticing slowdown, we recommend you try setting verbose: false.
"plugins": [
   ["@codesee/instrument", { "hosted": true, "verbose": false }],
   /* ... other dev plugins ... */


This setting affects all developers working on the application. It requires a clean build.

Rebuild and run your app locally

Rebuild your app, wait a few seconds, and you should see the CodeSee button towards the top right of your screen. Congrats, you're ready to start using CodeSee!