mirror of
https://github.com/kremalicious/metamask-extension.git
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b68aee1bef
The build script now uses `yargs` rather than `minimist`. The CLI is now better documented, and we have additional validation for each option. A patch for `yargs` was required because it would blow up on the line `Error.captureStackTrace`. For some reason when running under LavaMoat, that property did not exist. Closes #12766
30 lines
2.0 KiB
Markdown
30 lines
2.0 KiB
Markdown
# The MetaMask Build System
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> _tl;dr_ `yarn dist` for prod, `yarn start` for local development.
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> Add `--build-type flask` to build Flask, our canary distribution with more experimental features.
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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.
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From the repository root, the build system entry file is located at [`./development/build/index.js`](https://github.com/MetaMask/metamask-extension/blob/develop/development/build/index.js).
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Several package scripts invoke the build system.
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For example, `yarn start` creates a watched development build, and `yarn dist` creates a production build.
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Some of these scripts applies `lavamoat` to the build system, and some do not.
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For local development, building without `lavamoat` is faster and therefore preferable.
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The build system is not a full-featured CLI, but rather a script that expects some command line arguments and environment variables.
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For instructions regarding environment variables, see [the main repository readme](../../README.md#building-locally).
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Generally speaking, the build system consists of [`gulp`](https://npmjs.com/package/gulp) tasks that either manipulate static assets or bundle source files using [Browserify](https://browserify.org/).
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Production-ready zip files are written to the `./builds` directory, while "unpacked" extension builds
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are written to the `./dist` directory.
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Our JavaScript source files are transformed using [Babel](https://babeljs.io/), specifically using
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the [`babelify`](https://npmjs.com/package/babelify) Browserify transform.
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Source file bundling tasks are implemented in the [`./development/build/scripts.js`](https://github.com/MetaMask/metamask-extension/blob/develop/development/build/scripts.js).
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> Locally implemented Browserify transforms, _some of which affect how we write JavaScript_, are listed and documented [here](./transforms/README.md).
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## Usage
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See `node ./development/build/index.js --help`
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