Last updated 2 years ago by checkraiser .
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$ cnpm install streaming-fusion-cli 
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The CLI interface for Fusion.js

The fusion-cli package is responsible for orchestrating compile-time configuration for server and browser bundles, as well as development, test and production variations. It provides a standardized Babel configuration that includes async/await support as well as stage 3+ Ecmascript features.

Due to the complexity involved in configuring many permutations of configurations, Fusion.js does not support custom webpack.config. This design decision allows Fusion.js to eventually move away from Webpack if faster and better bundlers become available. Additionally, it allows Fusion.js to make changes to the internal webpack configuration without the concern of breaking users customizations. If you run into a situation where you feel you need to make a webpack customization, please reach out to us on slack or create an issue describing your use case.

The CLI is also responsible for hot module reloading in development mode, and for running the web server.


yarn add fusion-cli


The CLI API can be most easily run through the Yarn or NPX CLI, e.g. yarn fusion build or npx fusion build.

  • fusion build [dir] [--production] [--log-level] Builds your application assets

    This command generates transpiled javascript/source map files (aka assets, artifacts) for browser and server. By default it builds development assets, but can also build test and production assets, given the respective flags.

    Build artifacts are stored in the .fusion directory.

    • --production: Build production assets
    • --log-level: Log level to output to console [default: "info"]
  • fusion dev [dir] [--port] [--no-hmr] [--test] [--log-level] Builds development assets and runs the application in development mode

    Note that this command only builds browser artifacts in memory, and it doesn't save them to the filesystem. This allows hot module reloading to occur faster since there's no performance cost due to I/O access.

    • --port: The port on which the application runs [default: 3000]
    • --no-hmr: Run without hot modules replacement
    • --test: Run tests as well as application
    • --log-level: Log level to output to console [default: "info"]
  • fusion start [--environment] Runs your application, assuming you have previously built them via fusion build. Note that build artifacts must be saved to disk (i.e. this command will fail if you use fusion dev to build artifacts instead of fusion build.

    • --environment: Which environment/assets to run - defaults to first available assets among ["development", "production"]
  • fusion test [--watch] [--match] [--coverage] [--env] [--debug] [--updateSnapshot] Builds test assets and runs tests

    Tests are run with Jest

    • --watch: Automatically run tests when code changes.
    • --match="somestring": Only runs tests against files which match this string.
    • --coverage: Collects and outputs test coverage
    • --env: Which environments to run tests in. Defaults to "node,jsdom". You may specify only one.
    • --debug: Allows you to debug tests using the chrome inspector (chrome://inspect).
    • --updateSnapshot: Updates snapshots

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