fix(command): prevent executing `Cypress.*`-code before cypress initialization

[nsbarsukov]

Hi! I am a user of your plugin. I try to write my own plugin using your plugin as a basis. But I have faced with this problem.

Problem: Imagine that you have plugin.js-file:

import {
    addMatchImageSnapshotPlugin,
    matchImageSnapshotPlugin,
} from 'cypress-image-snapshot/plugin';

export function tuiAddSnapshotPlugin(on, config) {
    addMatchImageSnapshotPlugin(on, config);
    // ...
    on('after:screenshot', details => {
        // ...
        return matchImageSnapshotPlugin(details);
    })
}

And you have this command.js-file:

import {addMatchImageSnapshotCommand} from 'cypress-image-snapshot/command';

export function tuiAddMatchImageSnapshotCommand(options) {
    // ... some new logic
    addMatchImageSnapshotCommand(options);
}

Finally, everything is wrapped by index.js-file:

export * from './command';
export * from './plugin';

When you try to import plugin and command from your index.js and use it inside your cypress-tests, you will get error:

ReferenceError: Cypress is not defined

This happens because exporting of the plugin happens earlier than command (when Cypress is not yet ready). But some code (the changed lines of this PR) is not isolated by any function scope and we get the error. My PR will help to solve this problem without changing any logic of your code.

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: c35beb552763e46eb3c23d6b0e4b5e64040cd7ff

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[nsbarsukov]

@jaredpalmer could you review my contribution, please ?