73cd2b0306
This is a follow-up to #15318, which fixed a problem with environment variables. Every function in this module that passes options related to environment variables has been updated with a doc comment. This should make it clearer which options are mandatory and which are optional, hopefully preventing a similar mistake from happening in the future.
The MetaMask Build System
tl;dr
yarn distfor prod,yarn startfor local development. Add--build-type flaskto build Flask, our canary distribution with more experimental features.
This directory contains the MetaMask build system, which is used to build the MetaMask Extension such that it can be used in a supported browser.
From the repository root, the build system entry file is located at ./development/build/index.js.
Several package scripts invoke the build system.
For example, yarn start creates a watched development build, and yarn dist creates a production build.
Some of these scripts applies lavamoat to the build system, and some do not.
For local development, building without lavamoat is faster and therefore preferable.
The build system is not a full-featured CLI, but rather a script that expects some command line arguments and environment variables. For instructions regarding environment variables, see the main repository readme.
Generally speaking, the build system consists of gulp tasks that either manipulate static assets or bundle source files using Browserify.
Production-ready zip files are written to the ./builds directory, while "unpacked" extension builds
are written to the ./dist directory.
Our JavaScript source files are transformed using Babel, specifically using
the babelify Browserify transform.
Source file bundling tasks are implemented in the ./development/build/scripts.js.
Locally implemented Browserify transforms, some of which affect how we write JavaScript, are listed and documented here.
Usage
See node ./development/build/index.js --help