🔮 Levitate

A tool for helping to understand APIs exported and consumed by NPM packages (or any TypeScript code).

Usage

Compare exports of different package versions

# Compare exports of different versions of a package
npx @grafana/levitate compare \
    --prev @grafana/[email protected] \
    --current @grafana/ui@canary

List imports

# List the imports used by a program
npx @grafana/levitate list-imports \
    --path <PATH-TO-A-PACKAGE>/module.ts \
    --filters "@common/pages" "@grafana/data" \
    --verbose

List exports

# List the exports of a compiled package
npx @grafana/levitate list-exports \
    --path <PATH-TO-A-PACKAGE>/index.d.ts

Check compatibility between a module and a package

To check the compatibility of code using a specific version of a package (e.g.: @grafana/[email protected]) against another version of the same package (e.g. @grafana/[email protected]).

# Check if the current module.ts usage of @grafana/data is
# compatible with the latest version of it
npx @grafana/levitate is-compatible \
    --path <PATH-TO-A-PACKAGE>/module.ts \
    --target "@grafana/data@latest"

Ignore specific exports changes

To ignore changes (add, change, remove) from specific export names you can create a .levignore.js file in the same directory where you invoke levitate.

The format of this file should be as follows:

module.exports = {
  removals: [
    // each entry is a regex
    /Sample\.ignoreThisOne/,
    /Sample\.ignoreThisOneToo/,
    /Sample.*\b/,
    'Sample.ignoreThisOneToo', // strings are converted to regex to match exact
  ],
  changes: [
    //...
  ],
  additions: [
    //...
  ],
};

Note:

• Levitate will ignore symbols matching the regexes in any of the packages it inspects. If several packages export the same symbol name, they all will be ignored.
• This only affects the compare and is-compatible commands. It doesn't affect the list-imports or list-exports commands.
• You should locate your .levignore.js file in the same directory where you invoke levitate.

Contributing

If you are interested in contributing to the Levitate project please read the Contributing guide.