environments.html
1 <!DOCTYPE html> 2 <html lang="en" dir="ltr"> 3 <head prefix="og: http://ogp.me/ns#"> 4 <meta charset="utf-8"> 5 <title>Understanding Environments | Embark</title> 6 <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1"> 7 <meta name="viewport" content="width=device-width, initial-scale=1"> 8 <!-- Canonical links --> 9 <link rel="canonical" href="https://framework.embarklabs.io/docs/environments.html"> 10 <!-- Alternative links --> 11 12 13 <!-- Icon --> 14 <meta name="msapplication-TileColor" content="#080E1A"> 15 <link rel="icon" type="image/png" href="/assets/images/favicon-16.png" sizes="16x16" /> 16 <link rel="icon" type="image/png" href="/assets/images/favicon-32.png" sizes="32x32" /> 17 18 <link rel="apple-touch-icon" sizes="76x76" href="/assets/images/apple-touch-icon-60x60-precomposed.png"> 19 <link rel="apple-touch-icon" sizes="76x76" href="/assets/images/apple-touch-icon-76x76-precomposed.png"> 20 <link rel="apple-touch-icon" sizes="120x120" href="/assets/images/apple-touch-icon-120x120-precomposed.png"> 21 <link rel="apple-touch-icon" sizes="152x152" href="/assets/images/apple-touch-icon-152x152-precomposed.png"> 22 <link rel="apple-touch-icon" sizes="180x180" href="/assets/images/apple-touch-icon-precomposed.png"> 23 <link rel="apple-touch-icon" href="/assets/images/apple-touch-icon-precomposed.png"> 24 <!-- CSS --> 25 26 <link rel="stylesheet" href="/css/embark.css"> 27 28 <!-- endbuild --> 29 30 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css"> 31 <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css" /> 32 33 <!-- RSS --> 34 <link rel="alternate" href="/atom.xml" title="Embark"> 35 <meta property="og:image" content="/img/share.png?v=0.0.5" /> 36 <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.4/styles/dracula.min.css"> 37 38 <script async defer src="https://buttons.github.io/buttons.js"></script> 39 40 41 <script> 42 !function(root, factory) { 43 "function" == typeof define && define.amd ? // AMD. 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role="navigation" class="c-navigation"> 160 <div class="c-navigation__header"> 161 <a href="/" title="Embark" class="c-logo">Embark</a> 162 <button class="c-navigation__close u-text-light" title="Close menu"> 163 <svg class="c-icon c-icon--xs"><use xlink:href="/../assets/icons/symbols.svg#icon-close"></use></svg> 164 </button> 165 </div> 166 <div class="c-navigation__body"> 167 <ul class="c-navigation__list"> 168 <li class="c-navigation__item"> 169 <a href="/docs/quick_start.html" class="c-navigation__anchor " title="Quick Start">Quick Start</a> 170 </li> 171 <li class="c-navigation__item"> 172 <a href="/docs" class="c-navigation__anchor is-active" title="Learn">Learn</a> 173 </li> 174 <li class="c-navigation__item"> 175 <a href="/plugins" class="c-navigation__anchor " title="Plugins">Plugins</a> 176 </li> 177 <li class="c-navigation__item"> 178 <a href="/community" class="c-navigation__anchor " title="Community">Community</a> 179 </li> 180 <li class="c-navigation__item"> 181 <a href="https://blog.embarklabs.io" target="_blank" rel="noopener" class="c-navigation__anchor " title="Blog">Blog</a> 182 </li> 183 </ul> 184 </div> 185 </nav> 186 <div class="o-flex o-flex-center"> 187 <form action="" class="o-flex__item u-hidden-until-large"> 188 <input type="search" placeholder="Search" id="search-input"> 189 </form> 190 <div class="o-flex__item"> 191 <ul class="o-flex o-flex-center"> 192 <li class="o-flex__item"> 193 <a href="https://github.com/embarklabs/embark" title="Github" target="_blank" class="u-link-ghost"> 194 <svg class="c-icon"><use xlink:href="/../assets/icons/symbols.svg#icon-github"></use></svg> 195 </a> 196 </li> 197 <li class="o-flex__item"> 198 <a href="https://twitter.com/EmbarkProject" title="Twitter" target="_blank"> 199 <svg class="c-icon"><use xlink:href="/../assets/icons/symbols.svg#icon-twitter"></use></svg> 200 </a> 201 </li> 202 <li class="o-flex__item u-hidden-large-up"> 203 <button type="button"class="c-navigation__trigger u-link-ghost" title="Open menu"> 204 <svg class="c-icon"><use xlink:href="/../assets/icons/symbols.svg#icon-navigation-menu"></use></svg> 205 </button> 206 </li> 207 </ul> 208 </div> 209 </div> 210 </div> 211 <div class="c-quick-search o-distance-m u-hidden-large-up"> 212 <input type="search" id="inp-search" placeholder="Search"> 213 </div> 214 <div class="c-header__body"> 215 <h1 class="c-title u-text-ghost">Documentation</h1> 216 217 218 219 220 221 </div> 222 </div> 223 </header> 224 225 226 <main role="main"> 227 <section class="o-guided-content o-distance"> 228 <div class="o-guided-content__wrapper"> 229 <button title="Open docs menu" id="guides-trigger" class="c-button c-button--minion u-hidden-large-up"> 230 <svg class="c-icon c-icon--xs"><use xlink:href="/../../assets/icons/symbols.svg#icon-navigation-menu"></use></svg> 231 <span>Guides</span> 232 </button> 233 <div class="c-guide o-guided-content__guide" id="guide-navigation"> 234 <div class="c-guide__header u-hidden-large-up"> 235 <a href="" title="Guides"> 236 Guides 237 </a> 238 <button type="button" title="Close menu" id="guides-close"> 239 <svg class="c-icon c-icon--xs"><use xlink:href="/../../assets/icons/symbols.svg#icon-close"></use></svg> 240 </button> 241 </div> 242 <div class="c-guide__body"> 243 <nav role="navigation"> 244 245 <div class=""> 246 <h3 class="c-category-title">Getting Started</h3> 247 <ul class="o-list-bare"> 248 249 <li class="o-list-bare__item"> 250 <a href="/docs/overview.html" title="Overview" class="u-link-uniform ">Overview</a> 251 <!-- <div class="o-distance-m"> 252 <ul class="o-list-bare c-navigation__subnav"> 253 <li class="o-list-bare__item"> 254 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 255 </li> 256 </ul> 257 </div> --> 258 </li> 259 260 <li class="o-list-bare__item"> 261 <a href="/docs/installation.html" title="Installation" class="u-link-uniform ">Installation</a> 262 <!-- <div class="o-distance-m"> 263 <ul class="o-list-bare c-navigation__subnav"> 264 <li class="o-list-bare__item"> 265 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 266 </li> 267 </ul> 268 </div> --> 269 </li> 270 271 <li class="o-list-bare__item"> 272 <a href="/docs/faq.html" title="FAQ" class="u-link-uniform ">FAQ</a> 273 <!-- <div class="o-distance-m"> 274 <ul class="o-list-bare c-navigation__subnav"> 275 <li class="o-list-bare__item"> 276 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 277 </li> 278 </ul> 279 </div> --> 280 </li> 281 282 </ul> 283 284 285 <div class="o-distance-xl"> 286 <h3 class="c-category-title">General Usage</h3> 287 <ul class="o-list-bare"> 288 289 <li class="o-list-bare__item"> 290 <a href="/docs/create_project.html" title="Creating apps" class="u-link-uniform ">Creating apps</a> 291 <!-- <div class="o-distance-m"> 292 <ul class="o-list-bare c-navigation__subnav"> 293 <li class="o-list-bare__item"> 294 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 295 </li> 296 </ul> 297 </div> --> 298 </li> 299 300 <li class="o-list-bare__item"> 301 <a href="/docs/structure.html" title="App structure" class="u-link-uniform ">App structure</a> 302 <!-- <div class="o-distance-m"> 303 <ul class="o-list-bare c-navigation__subnav"> 304 <li class="o-list-bare__item"> 305 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 306 </li> 307 </ul> 308 </div> --> 309 </li> 310 311 <li class="o-list-bare__item"> 312 <a href="/docs/running_apps.html" title="Running apps" class="u-link-uniform ">Running apps</a> 313 <!-- <div class="o-distance-m"> 314 <ul class="o-list-bare c-navigation__subnav"> 315 <li class="o-list-bare__item"> 316 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 317 </li> 318 </ul> 319 </div> --> 320 </li> 321 322 <li class="o-list-bare__item"> 323 <a href="/docs/dashboard.html" title="Using the dashboard" class="u-link-uniform ">Using the dashboard</a> 324 <!-- <div class="o-distance-m"> 325 <ul class="o-list-bare c-navigation__subnav"> 326 <li class="o-list-bare__item"> 327 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 328 </li> 329 </ul> 330 </div> --> 331 </li> 332 333 <li class="o-list-bare__item"> 334 <a href="/docs/using_the_console.html" title="Using the console" class="u-link-uniform ">Using the console</a> 335 <!-- <div class="o-distance-m"> 336 <ul class="o-list-bare c-navigation__subnav"> 337 <li class="o-list-bare__item"> 338 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 339 </li> 340 </ul> 341 </div> --> 342 </li> 343 344 <li class="o-list-bare__item"> 345 <a href="/docs/environments.html" title="Environments" class="u-link-uniform is-active">Environments</a> 346 <!-- <div class="o-distance-m"> 347 <ul class="o-list-bare c-navigation__subnav"> 348 <li class="o-list-bare__item"> 349 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 350 </li> 351 </ul> 352 </div> --> 353 </li> 354 355 <li class="o-list-bare__item"> 356 <a href="/docs/configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 357 <!-- <div class="o-distance-m"> 358 <ul class="o-list-bare c-navigation__subnav"> 359 <li class="o-list-bare__item"> 360 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 361 </li> 362 </ul> 363 </div> --> 364 </li> 365 366 <li class="o-list-bare__item"> 367 <a href="/docs/pipeline_and_webpack.html" title="Building & Compiling" class="u-link-uniform ">Building & Compiling</a> 368 <!-- <div class="o-distance-m"> 369 <ul class="o-list-bare c-navigation__subnav"> 370 <li class="o-list-bare__item"> 371 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 372 </li> 373 </ul> 374 </div> --> 375 </li> 376 377 <li class="o-list-bare__item"> 378 <a href="/docs/executing_scripts.html" title="Executing Scripts" class="u-link-uniform ">Executing Scripts</a> 379 <!-- <div class="o-distance-m"> 380 <ul class="o-list-bare c-navigation__subnav"> 381 <li class="o-list-bare__item"> 382 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 383 </li> 384 </ul> 385 </div> --> 386 </li> 387 388 <li class="o-list-bare__item"> 389 <a href="/docs/javascript_usage.html" title="Using EmbarkJS" class="u-link-uniform ">Using EmbarkJS</a> 390 <!-- <div class="o-distance-m"> 391 <ul class="o-list-bare c-navigation__subnav"> 392 <li class="o-list-bare__item"> 393 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 394 </li> 395 </ul> 396 </div> --> 397 </li> 398 399 </ul> 400 </div> 401 402 <div class="o-distance-xl"> 403 <h3 class="c-category-title">Smart Contract Development</h3> 404 <ul class="o-list-bare"> 405 406 <li class="o-list-bare__item"> 407 <a href="/docs/contracts_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 408 <!-- <div class="o-distance-m"> 409 <ul class="o-list-bare c-navigation__subnav"> 410 <li class="o-list-bare__item"> 411 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 412 </li> 413 </ul> 414 </div> --> 415 </li> 416 417 <li class="o-list-bare__item"> 418 <a href="/docs/contracts_deployment.html" title="Accounts & Deployment" class="u-link-uniform ">Accounts & Deployment</a> 419 <!-- <div class="o-distance-m"> 420 <ul class="o-list-bare c-navigation__subnav"> 421 <li class="o-list-bare__item"> 422 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 423 </li> 424 </ul> 425 </div> --> 426 </li> 427 428 <li class="o-list-bare__item"> 429 <a href="/docs/contracts_imports.html" title="Special Imports" class="u-link-uniform ">Special Imports</a> 430 <!-- <div class="o-distance-m"> 431 <ul class="o-list-bare c-navigation__subnav"> 432 <li class="o-list-bare__item"> 433 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 434 </li> 435 </ul> 436 </div> --> 437 </li> 438 439 <li class="o-list-bare__item"> 440 <a href="/docs/contracts_testing.html" title="Testing" class="u-link-uniform ">Testing</a> 441 <!-- <div class="o-distance-m"> 442 <ul class="o-list-bare c-navigation__subnav"> 443 <li class="o-list-bare__item"> 444 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 445 </li> 446 </ul> 447 </div> --> 448 </li> 449 450 <li class="o-list-bare__item"> 451 <a href="/docs/contracts_javascript.html" title="Smart Contracts in JavaScript" class="u-link-uniform ">Smart Contracts in JavaScript</a> 452 <!-- <div class="o-distance-m"> 453 <ul class="o-list-bare c-navigation__subnav"> 454 <li class="o-list-bare__item"> 455 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 456 </li> 457 </ul> 458 </div> --> 459 </li> 460 461 </ul> 462 </div> 463 464 <div class="o-distance-xl"> 465 <h3 class="c-category-title">Blockchain Client</h3> 466 <ul class="o-list-bare"> 467 468 <li class="o-list-bare__item"> 469 <a href="/docs/blockchain_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 470 <!-- <div class="o-distance-m"> 471 <ul class="o-list-bare c-navigation__subnav"> 472 <li class="o-list-bare__item"> 473 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 474 </li> 475 </ul> 476 </div> --> 477 </li> 478 479 <li class="o-list-bare__item"> 480 <a href="/docs/blockchain_accounts_configuration.html" title="Managing Accounts" class="u-link-uniform ">Managing Accounts</a> 481 <!-- <div class="o-distance-m"> 482 <ul class="o-list-bare c-navigation__subnav"> 483 <li class="o-list-bare__item"> 484 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 485 </li> 486 </ul> 487 </div> --> 488 </li> 489 490 </ul> 491 </div> 492 493 <div class="o-distance-xl"> 494 <h3 class="c-category-title">Storage (IPFS/Swarm)</h3> 495 <ul class="o-list-bare"> 496 497 <li class="o-list-bare__item"> 498 <a href="/docs/storage_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 499 <!-- <div class="o-distance-m"> 500 <ul class="o-list-bare c-navigation__subnav"> 501 <li class="o-list-bare__item"> 502 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 503 </li> 504 </ul> 505 </div> --> 506 </li> 507 508 <li class="o-list-bare__item"> 509 <a href="/docs/storage_deployment.html" title="Deploying apps" class="u-link-uniform ">Deploying apps</a> 510 <!-- <div class="o-distance-m"> 511 <ul class="o-list-bare c-navigation__subnav"> 512 <li class="o-list-bare__item"> 513 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 514 </li> 515 </ul> 516 </div> --> 517 </li> 518 519 <li class="o-list-bare__item"> 520 <a href="/docs/storage_javascript.html" title="Storage APIs in JavaScript" class="u-link-uniform ">Storage APIs in JavaScript</a> 521 <!-- <div class="o-distance-m"> 522 <ul class="o-list-bare c-navigation__subnav"> 523 <li class="o-list-bare__item"> 524 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 525 </li> 526 </ul> 527 </div> --> 528 </li> 529 530 </ul> 531 </div> 532 533 <div class="o-distance-xl"> 534 <h3 class="c-category-title">Messages (Whisper)</h3> 535 <ul class="o-list-bare"> 536 537 <li class="o-list-bare__item"> 538 <a href="/docs/messages_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 539 <!-- <div class="o-distance-m"> 540 <ul class="o-list-bare c-navigation__subnav"> 541 <li class="o-list-bare__item"> 542 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 543 </li> 544 </ul> 545 </div> --> 546 </li> 547 548 <li class="o-list-bare__item"> 549 <a href="/docs/messages_javascript.html" title="Messages in JavaScript" class="u-link-uniform ">Messages in JavaScript</a> 550 <!-- <div class="o-distance-m"> 551 <ul class="o-list-bare c-navigation__subnav"> 552 <li class="o-list-bare__item"> 553 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 554 </li> 555 </ul> 556 </div> --> 557 </li> 558 559 </ul> 560 </div> 561 562 <div class="o-distance-xl"> 563 <h3 class="c-category-title">Naming Systems (ENS)</h3> 564 <ul class="o-list-bare"> 565 566 <li class="o-list-bare__item"> 567 <a href="/docs/naming_configuration.html" title="Configuration" class="u-link-uniform ">Configuration</a> 568 <!-- <div class="o-distance-m"> 569 <ul class="o-list-bare c-navigation__subnav"> 570 <li class="o-list-bare__item"> 571 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 572 </li> 573 </ul> 574 </div> --> 575 </li> 576 577 <li class="o-list-bare__item"> 578 <a href="/docs/naming_javascript.html" title="Naming Systems in JavaScript" class="u-link-uniform ">Naming Systems in JavaScript</a> 579 <!-- <div class="o-distance-m"> 580 <ul class="o-list-bare c-navigation__subnav"> 581 <li class="o-list-bare__item"> 582 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 583 </li> 584 </ul> 585 </div> --> 586 </li> 587 588 </ul> 589 </div> 590 591 <div class="o-distance-xl"> 592 <h3 class="c-category-title">Plugins</h3> 593 <ul class="o-list-bare"> 594 595 <li class="o-list-bare__item"> 596 <a href="/docs/installing_plugins.html" title="Installing plugins" class="u-link-uniform ">Installing plugins</a> 597 <!-- <div class="o-distance-m"> 598 <ul class="o-list-bare c-navigation__subnav"> 599 <li class="o-list-bare__item"> 600 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 601 </li> 602 </ul> 603 </div> --> 604 </li> 605 606 <li class="o-list-bare__item"> 607 <a href="/docs/creating_plugins.html" title="Creating plugins" class="u-link-uniform ">Creating plugins</a> 608 <!-- <div class="o-distance-m"> 609 <ul class="o-list-bare c-navigation__subnav"> 610 <li class="o-list-bare__item"> 611 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 612 </li> 613 </ul> 614 </div> --> 615 </li> 616 617 <li class="o-list-bare__item"> 618 <a href="/docs/plugin_reference.html" title="Plugin APIs" class="u-link-uniform ">Plugin APIs</a> 619 <!-- <div class="o-distance-m"> 620 <ul class="o-list-bare c-navigation__subnav"> 621 <li class="o-list-bare__item"> 622 <a href="#" title="What is Embark?" class="u-link-uniform">What is Embark?</a> 623 </li> 624 </ul> 625 </div> --> 626 </li> 627 628 </ul> 629 </div> 630 631 <div class="o-distance-xl"> 632 <h3 class="c-category-title">Cockpit Guides</h3> 633 <ul class="o-list-bare"> 634 635 <li class="o-list-bare__item"> 636 <a href="/docs/cockpit_introduction.html" title="Introduction" class="u-link-uniform ">Introduction</a> 637 <!-- <div class="o-distance-m"> 638 <ul class="o-list-bare c-navigation__subnav"> 639 <li class="o-list-bare__item"> 640 <a href="#" title="What is Embark?" 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762 </nav> 763 </div> 764 </div> 765 <div class="o-guided-content__content"> 766 <p class="c-meta">Last updated: January 19th 2020 767 (<a href="https://github.com/embarklabs/embark/edit/master/site/source/docs/environments.md" target="_blank"> 768 Improve this guide <svg class="c-icon c-icon--xs"><use xlink:href="/../../assets/icons/symbols.svg#icon-pen-write-paper"></use></svg> 769 </a>) 770 </p> 771 <div class="o-standard-page"> 772 <h1>Understanding Environments</h1> 773 <p>Embark comes with the concept of “Environments”, which make it easy to switch between different configurations of various parts of our applications that alter how the application is being built and deployed. For example, during development we probably prefer deploying our Smart Contracts on a local blockchain or testnet, until we’re sure the code is ready for prime time and can be deployed in a production environment.</p> 774 <p>In this guide we’ll discuss how to take advantage of environments within various configuration files of our Embark application.</p> 775 <h2 id="Default-environment"><a href="#Default-environment" class="headerlink" title="Default environment"></a>Default environment</h2><p>In our guide covering <a href="structure.html">application structures</a> in Embark, we’ve talked about that every component of our decentralized application, such as IPFS as a storage solution and Geth as a blockchain client, can be configured using a dedicated configuration file. We’ll dive more into what each configuration looks like in our guides on <a href="contracts_configuration.html">configuring Smart Contracts</a>, <a href="storage_configuration.html">configuring decentralized storages</a> and <a href="messages_configuration.html">configuring communication channels</a>. For now, we’ll focus on the concept of <strong>default environments</strong>.</p> 776 <p>Environments can be defined as part of a configuration file for a dedicated service or component of our application. We can introduce as many environments as we like. It is important to understand that <code>default</code> is a special environment that can be <strong>extended</strong> by other environments.</p> 777 <p>Let’s take a look at the <code>config/contracts.js</code> file that we’ve created in the <a href="quick_start.html">Quickstart</a>:</p> 778 <figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">module.exports = {</span><br><span class="line"> default: {</span><br><span class="line"> dappConnection: [</span><br><span class="line"> "$WEB3",</span><br><span class="line"> "ws://localhost:8546",</span><br><span class="line"> "http://localhost:8545"</span><br><span class="line"> ],</span><br><span class="line"> gas: "auto",</span><br><span class="line"> deploy: {</span><br><span class="line"> SimpleStorage: {</span><br><span class="line"> args: [100]</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure> 779 780 <p>Don’t get too overwhelmed by all the different options and what they mean. We’ll discuss those in-depth in <a href="contracts_configuration.html">configuring Smart Contracts</a> and <code>dappConneciton</code> <a href="/docs/javascript_usage.html#Using-dappConnection">here</a>. The important part here is that <code>contracts.js</code> exports an object that provides a <code>default</code> configuration. This configuration is the default environment and can be overwritten or extended by other environments. </p> 781 <p>If we execute <code>$ embark run</code>, Embark will use the <code>default</code> configuration to deploy our application’s Smart Contracts.</p> 782 <h2 id="Adding-and-extending-environments"><a href="#Adding-and-extending-environments" class="headerlink" title="Adding and extending environments"></a>Adding and extending environments</h2><p>As mentioned earlier, the <code>default</code> environment can be easily extended and overwritten by other configurations. Let’s say we had a <code>custom</code> environment as well, which should come with the same configuration as <code>default</code>, but deploy <code>SimpleStorage</code> with a different constructor parameter value. We can do that by simply introducing a configuration for <code>custom</code> and specify the options as we need:</p> 783 <figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">module.exports = {</span><br><span class="line"> ...</span><br><span class="line"> custom: {</span><br><span class="line"> deploy: {</span><br><span class="line"> SimpleStorage: {</span><br><span class="line"> args: [200]</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure> 784 785 <p>Now, when running Embark with the <code>custom</code> environment as discussed in our guide on <a href="/docs/running_apps.html#Switching-environments">Running applications</a>, Embark will merge the <code>custom</code> configuration with <code>default</code> and use the resulting configuration object accordingly:</p> 786 <figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">$ embark run custom</span><br></pre></td></tr></table></figure> 787 788 <div class="c-notification c-notification--info"> 789 <p><strong>Quick</strong></p> 790 <p><p>Notice that Embark usually already provides an additional <code>development</code> configuration. As a matter of fact, when no environment is specified in <code>embark run</code>, Embark will use the <code>development</code> configuration. </p> 791 <p>This means that</p> 792 <pre>$ embark run</pre> 793 794 <p>is the same as</p> 795 <pre>$ embark run development</pre> 796 </p> 797 </div> 798 799 800 801 <p>In the next chapter, we’ll take a closer look at how our application can be configured using the <code>embark.json</code> configuration file.</p> 802 803 </div> 804 <div class="o-container-medium o-distance-l"> 805 <div class="o-flex o-flex-space-between"> 806 807 <div class="o-flex__item"> 808 <a href="/docs/using_the_console.html" class="c-button c-button--quite" title="Previous article">Previous</a> 809 </div> 810 811 812 <div class="o-flex__item"> 813 <a href="/docs/configuration.html" class="c-button c-button--quite" title="Next article">Next</a> 814 </div> 815 816 </div> 817 818 819 </div> 820 </div> 821 <div class="o-guided-content__addition"> 822 <h3 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