shakediff [options] <module file> <export list>

-b {parcel|rollup|webpack}, --bundler={parcel|rollup|webpack}
    Choose a bundler, or use the specified <module>. Default is "rollup".

    Bundlers are not installed by default, please make sure to install one:

        parcel:   @shakediff/bundler-parcel
        rollup:   @shakediff/bundler-rollup
        webpack:  @shakediff/bundler-webpack

    Or provide one with an esm import specifier:

        https://nodejs.org/api/esm.html#esm_import_specifiers

    Any module with the following interface can be used:

        export default async function bundle(entryPath, modulePath, tempDir) {
          return 'bundled module code'
        }

-t <tool>, --tool=<tool>
    Diff with the specified <tool>. Default is "diff".

-h, --help
    Display this help and exit.

$ shakediff module.mjs foo

$ shakediff -b webpack module.mjs foo bar

$ shakediff -t "diff -u" module.mjs foo

$ shakediff module.mjs foo | diffstat

$ shakediff -t "gvim -df" module.mjs foo

$ shakediff -t "git diff --no-index --histogram" module.mjs foo