# All files / server-old/src/modern index.js

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     // Modern - Create a modern middleware from the old-style one

    // Cleanly validate data
    const validate = require('./validate');

    // Pass it an old middleware and return a new one 'ctx => promise'
    module.exports = middle => {

      // Validate it early so no requests need to be made
      validate.middleware(middle);

      // Create and return the modern middleware function
      return ctx => new Promise((resolve, reject) => {
        validate.context(ctx);

        // It can handle both success or errors. Pass the right ctx
        const next = err => err ? reject(err) : resolve();

        // Call the old middleware
        middle(ctx.req, ctx.res, next);
      });
    };