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metamask-extension/development/build/README.md
Erik Marks 413700afc7
Rationalize build system arguments (#12047) 
This rationalizes how arguments are passed to and parsed by the build system. To accomplish this, everything that isn't an environment variable from `.metamaskrc` or our CI environment is now passed as an argument on the command line.

Of such arguments, the `entryTask` is still expected as a positional argument in the first position (i.e. `process.argv[2]`), but everything else must be passed as a named argument. We use `minimist` to parse the arguments, and set defaults to preserve existing behavior.

Arguments are parsed in a new function, `parseArgv`, in `development/build/index.js`. They are assigned to environment variables where convenient, and otherwise returned from `parseArgv` to be passed to other functions invoked in the same file.

This change is motivated by our previous inconsistent handling of arguments to the build system, which will grow increasingly problematic as the build system grows in complexity. (Which it will very shortly, as we introduce Flask builds.)

Miscellaneous changes:
- Adds a build system readme at `development/build/README.md`
- Removes the `beta` package script. Now, we can instead call: `yarn dist --build-type beta`
- Fixes the casing of some log messages and reorders some parameters in the build system
2021-09-09 12:44:57 -07:00

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The MetaMask Build System

tl;dr yarn dist for prod, yarn start for local development

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.

Here follows basic usage information for the build system.

Usage: yarn build <entry-task> [options]

Commands:
  yarn build prod       Create an optimized build for production environments.

  yarn build dev        Create an unoptimized, live-reloaded build for local
                        development.

  yarn build test       Create an optimized build for running e2e tests.

  yarn build testDev    Create an unoptimized, live-reloaded build for running
                        e2e tests.

Options:
  --beta-version     If the build type is "beta", the beta version number.
                                                           [number] [default: 0]
  --build-type       The "type" of build to create. One of: "beta", "main"
                                                      [string] [default: "main"]
  --omit-lockdown    Whether to omit SES lockdown files from the extension
                     bundle. Useful when linking dependencies that are
                     incompatible with lockdown.
                                                      [boolean] [default: false]
  --skip-stats       Whether to refrain from logging build progress. Mostly used
                     internally.
                                                      [boolean] [default: false]