Merge pull request #537 from 0xProject/feature/artifacts-v2

Implement the new artifacts format

31 files changed, 368 insertions, 305 deletions

diff --git a/.gitignore b/.gitignore
index 83538fdca..7fed1959e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -77,7 +77,7 @@ bin/
 packages/sol-cov/test/fixtures/artifacts
 packages/metacoin/artifacts
 packages/0x.js/test/artifacts
-packages/migrations/src/artifacts
+packages/migrations/artifacts/1.0.0
 
 # generated contract wrappers
 packages/0x.js/src/contract_wrappers/generated/
diff --git a/.prettierignore b/.prettierignore
index 024d0b548..f12fdf870 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -2,6 +2,6 @@ lib
 .nyc_output
 /packages/contracts/src/artifacts
 /packages/metacoin/artifacts
-/packages/migrations/src/artifacts
+/packages/migrations/artifacts/1.0.0
 package.json
 scripts/postpublish_utils.js
diff --git a/packages/0x.js/package.json b/packages/0x.js/package.json
index d3cf9ad5f..a23e01938 100644
--- a/packages/0x.js/package.json
+++ b/packages/0x.js/package.json
@@ -21,7 +21,7 @@
         "test": "run-s clean test:commonjs",
         "test:coverage": "nyc npm run test --all && yarn coverage:report:lcov",
         "coverage:report:lcov": "nyc report --reporter=text-lcov > coverage/lcov.info",
-        "update_artifacts": "for i in ${npm_package_config_contracts}; do copyfiles -u 4 ../migrations/src/artifacts/$i.json test/artifacts; done;",
+        "update_artifacts": "for i in ${npm_package_config_contracts}; do copyfiles -u 4 ../migrations/artifacts/1.0.0/$i.json test/artifacts; done;",
         "clean": "shx rm -rf _bundles lib test_temp scripts",
         "build:umd:prod": "NODE_ENV=production webpack",
         "build:commonjs": "tsc && yarn update_artifacts && copyfiles -u 2 './src/compact_artifacts/**/*.json' ./lib/src/compact_artifacts && copyfiles -u 3 './lib/src/monorepo_scripts/**/*' ./scripts",
diff --git a/packages/abi-gen/src/index.ts b/packages/abi-gen/src/index.ts
index ecef33b16..7125171b9 100644
--- a/packages/abi-gen/src/index.ts
+++ b/packages/abi-gen/src/index.ts
@@ -108,8 +108,8 @@ for (const abiFileName of abiFileNames) {
         ABI = parsedContent; // ABI file
     } else if (!_.isUndefined(parsedContent.abi)) {
         ABI = parsedContent.abi; // Truffle artifact
-    } else if (!_.isUndefined(parsedContent.networks) && !_.isUndefined(parsedContent.networks[args.networkId])) {
-        ABI = parsedContent.networks[args.networkId].abi; // 0x contracts package artifact
+    } else if (!_.isUndefined(parsedContent.compilerOutput.abi)) {
+        ABI = parsedContent.compilerOutput.abi; // 0x artifact
     }
     if (_.isUndefined(ABI)) {
         logUtils.log(`${chalk.red(`ABI not found in ${abiFileName}.`)}`);
diff --git a/packages/contracts/compiler.json b/packages/contracts/compiler.json
new file mode 100644
index 000000000..493d6373d
--- /dev/null
+++ b/packages/contracts/compiler.json
@@ -0,0 +1,33 @@
+{
+    "artifactsDir": "../migrations/artifacts/1.0.0",
+    "contractsDir": "src/contracts",
+    "compilerSettings": {
+        "outputSelection": {
+            "*": {
+                "*": [
+                    "abi",
+                    "evm.bytecode.object",
+                    "evm.bytecode.sourceMap",
+                    "evm.deployedBytecode.object",
+                    "evm.deployedBytecode.sourceMap"
+                ]
+            }
+        }
+    },
+    "contracts": [
+        "Exchange",
+        "DummyToken",
+        "ZRXToken",
+        "Token",
+        "WETH9",
+        "TokenTransferProxy",
+        "MultiSigWallet",
+        "MultiSigWalletWithTimeLock",
+        "MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress",
+        "MaliciousToken",
+        "TokenRegistry",
+        "Arbitrage",
+        "EtherDelta",
+        "AccountLevels"
+    ]
+}
diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index 6d51d71cb..c47518f17 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -10,13 +10,13 @@
     "scripts": {
         "build:watch": "tsc -w",
         "prebuild": "run-s clean compile copy_artifacts generate_contract_wrappers",
-        "copy_artifacts": "copyfiles -u 4 '../migrations/src/artifacts/**/*' ./lib/src/artifacts;",
+        "copy_artifacts": "copyfiles -u 4 '../migrations/artifacts/1.0.0/**/*' ./lib/src/artifacts;",
         "build": "tsc",
         "test": "run-s build run_mocha",
         "test:coverage": "SOLIDITY_COVERAGE=true run-s build run_mocha coverage:report:text coverage:report:lcov",
         "run_mocha": "mocha 'lib/test/**/*.js' --timeout 100000 --bail --exit",
         "compile:comment": "Yarn workspaces do not link binaries correctly so we need to reference them directly https://github.com/yarnpkg/yarn/issues/3846",
-        "compile": "node ../deployer/lib/src/cli.js compile --contracts ${npm_package_config_contracts} --contracts-dir src/contracts --artifacts-dir ../migrations/src/artifacts",
+        "compile": "node ../deployer/lib/src/cli.js compile",
         "clean": "shx rm -rf ./lib",
         "generate_contract_wrappers": "node ../abi-gen/lib/index.js --abis  ${npm_package_config_abis} --template ../contract_templates/contract.handlebars --partials '../contract_templates/partials/**/*.handlebars' --output src/contract_wrappers/generated --backend ethers && prettier --write 'src/contract_wrappers/generated/**.ts'",
         "lint": "tslint --project . 'migrations/**/*.ts' 'test/**/*.ts' 'util/**/*.ts' 'deploy/**/*.ts'",
@@ -26,8 +26,7 @@
         "test:circleci": "yarn test:coverage"
     },
     "config": {
-        "abis": "../migrations/src/artifacts/@(DummyToken|TokenTransferProxy|Exchange|TokenRegistry|MultiSigWallet|MultiSigWalletWithTimeLock|MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress|TokenRegistry|ZRXToken|Arbitrage|EtherDelta|AccountLevels).json",
-        "contracts": "Exchange,DummyToken,ZRXToken,Token,WETH9,TokenTransferProxy,MultiSigWallet,MultiSigWalletWithTimeLock,MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress,MaliciousToken,TokenRegistry,Arbitrage,EtherDelta,AccountLevels"
+        "abis": "../migrations/artifacts/1.0.0/@(DummyToken|TokenTransferProxy|Exchange|TokenRegistry|MultiSigWallet|MultiSigWalletWithTimeLock|MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress|TokenRegistry|ZRXToken|Arbitrage|EtherDelta|AccountLevels).json"
     },
     "repository": {
         "type": "git",
diff --git a/packages/contracts/test/multi_sig_with_time_lock.ts b/packages/contracts/test/multi_sig_with_time_lock.ts
index b7604457f..5cc744713 100644
--- a/packages/contracts/test/multi_sig_with_time_lock.ts
+++ b/packages/contracts/test/multi_sig_with_time_lock.ts
@@ -17,7 +17,7 @@ import { chaiSetup } from './utils/chai_setup';
 import { deployer } from './utils/deployer';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
 
-const MULTI_SIG_ABI = artifacts.MultiSigWalletWithTimeLockArtifact.networks[constants.TESTRPC_NETWORK_ID].abi;
+const MULTI_SIG_ABI = artifacts.MultiSigWalletWithTimeLockArtifact.compilerOutput.abi;
 chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
diff --git a/packages/contracts/test/multi_sig_with_time_lock_except_remove_auth_addr.ts b/packages/contracts/test/multi_sig_with_time_lock_except_remove_auth_addr.ts
index 2f928ede2..06fa30d96 100644
--- a/packages/contracts/test/multi_sig_with_time_lock_except_remove_auth_addr.ts
+++ b/packages/contracts/test/multi_sig_with_time_lock_except_remove_auth_addr.ts
@@ -17,10 +17,9 @@ import { ContractName, SubmissionContractEventArgs, TransactionDataParams } from
 import { chaiSetup } from './utils/chai_setup';
 import { deployer } from './utils/deployer';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
-const PROXY_ABI = artifacts.TokenTransferProxyArtifact.networks[constants.TESTRPC_NETWORK_ID].abi;
+const PROXY_ABI = artifacts.TokenTransferProxyArtifact.compilerOutput.abi;
 const MUTISIG_WALLET_WITH_TIME_LOCK_EXCEPT_REMOVE_AUTHORIZED_ADDRESS_ABI =
-    artifacts.MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddressArtifact.networks[constants.TESTRPC_NETWORK_ID]
-        .abi;
+    artifacts.MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddressArtifact.compilerOutput.abi;
 
 chaiSetup.configure();
 const expect = chai.expect;
diff --git a/packages/contracts/util/artifacts.ts b/packages/contracts/util/artifacts.ts
index 7c375c1b7..a1d6e5060 100644
--- a/packages/contracts/util/artifacts.ts
+++ b/packages/contracts/util/artifacts.ts
@@ -1,3 +1,5 @@
+import { ContractArtifact } from '@0xproject/deployer';
+
 import * as DummyTokenArtifact from '../src/artifacts/DummyToken.json';
 import * as ExchangeArtifact from '../src/artifacts/Exchange.json';
 import * as MaliciousTokenArtifact from '../src/artifacts/MaliciousToken.json';
@@ -9,17 +11,15 @@ import * as TokenTransferProxyArtifact from '../src/artifacts/TokenTransferProxy
 import * as EtherTokenArtifact from '../src/artifacts/WETH9.json';
 import * as ZRXArtifact from '../src/artifacts/ZRXToken.json';
 
-import { Artifact } from './types';
-
 export const artifacts = {
-    ZRXArtifact: (ZRXArtifact as any) as Artifact,
-    DummyTokenArtifact: (DummyTokenArtifact as any) as Artifact,
-    TokenArtifact: (TokenArtifact as any) as Artifact,
-    ExchangeArtifact: (ExchangeArtifact as any) as Artifact,
-    EtherTokenArtifact: (EtherTokenArtifact as any) as Artifact,
-    TokenRegistryArtifact: (TokenRegistryArtifact as any) as Artifact,
-    MaliciousTokenArtifact: (MaliciousTokenArtifact as any) as Artifact,
-    TokenTransferProxyArtifact: (TokenTransferProxyArtifact as any) as Artifact,
-    MultiSigWalletWithTimeLockArtifact: (MultiSigWalletWithTimeLockArtifact as any) as Artifact,
-    MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddressArtifact: (MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddressArtifact as any) as Artifact,
+    ZRXArtifact: (ZRXArtifact as any) as ContractArtifact,
+    DummyTokenArtifact: (DummyTokenArtifact as any) as ContractArtifact,
+    TokenArtifact: (TokenArtifact as any) as ContractArtifact,
+    ExchangeArtifact: (ExchangeArtifact as any) as ContractArtifact,
+    EtherTokenArtifact: (EtherTokenArtifact as any) as ContractArtifact,
+    TokenRegistryArtifact: (TokenRegistryArtifact as any) as ContractArtifact,
+    MaliciousTokenArtifact: (MaliciousTokenArtifact as any) as ContractArtifact,
+    TokenTransferProxyArtifact: (TokenTransferProxyArtifact as any) as ContractArtifact,
+    MultiSigWalletWithTimeLockArtifact: (MultiSigWalletWithTimeLockArtifact as any) as ContractArtifact,
+    MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddressArtifact: (MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddressArtifact as any) as ContractArtifact,
 };
diff --git a/packages/contracts/util/types.ts b/packages/contracts/util/types.ts
index 321084c42..9bc412433 100644
--- a/packages/contracts/util/types.ts
+++ b/packages/contracts/util/types.ts
@@ -100,19 +100,3 @@ export enum ContractName {
     EtherDelta = 'EtherDelta',
     Arbitrage = 'Arbitrage',
 }
-
-export interface Artifact {
-    contract_name: ContractName;
-    networks: {
-        [networkId: number]: {
-            abi: ContractAbi;
-            solc_version: string;
-            keccak256: string;
-            optimizer_enabled: number;
-            unlinked_binary: string;
-            updated_at: number;
-            address: string;
-            constructor_args: string;
-        };
-    };
-}
diff --git a/packages/deployer/src/cli.ts b/packages/deployer/src/cli.ts
index 7f1ae708a..8c89cf382 100644
--- a/packages/deployer/src/cli.ts
+++ b/packages/deployer/src/cli.ts
@@ -13,13 +13,13 @@ import { constants } from './utils/constants';
 import { consoleReporter } from './utils/error_reporter';
 import { CliOptions, CompilerOptions, DeployerOptions } from './utils/types';
 
-const DEFAULT_OPTIMIZER_ENABLED = false;
 const DEFAULT_CONTRACTS_DIR = path.resolve('src/contracts');
 const DEFAULT_ARTIFACTS_DIR = path.resolve('src/artifacts');
 const DEFAULT_NETWORK_ID = 50;
 const DEFAULT_JSONRPC_URL = 'http://localhost:8545';
 const DEFAULT_GAS_PRICE = (10 ** 9 * 2).toString();
 const DEFAULT_CONTRACTS_LIST = '*';
+const SEPARATOR = ',';
 
 /**
  * Compiles all contracts with options passed in through CLI.
@@ -28,10 +28,8 @@ const DEFAULT_CONTRACTS_LIST = '*';
 async function onCompileCommandAsync(argv: CliOptions): Promise<void> {
     const opts: CompilerOptions = {
         contractsDir: argv.contractsDir,
-        networkId: argv.networkId,
-        optimizerEnabled: argv.shouldOptimize,
         artifactsDir: argv.artifactsDir,
-        specifiedContracts: getContractsSetFromList(argv.contracts),
+        contracts: argv.contracts === DEFAULT_CONTRACTS_LIST ? DEFAULT_CONTRACTS_LIST : argv.contracts.split(SEPARATOR),
     };
     await commands.compileAsync(opts);
 }
@@ -46,10 +44,8 @@ async function onDeployCommandAsync(argv: CliOptions): Promise<void> {
     const networkId = await web3Wrapper.getNetworkIdAsync();
     const compilerOpts: CompilerOptions = {
         contractsDir: argv.contractsDir,
-        networkId,
-        optimizerEnabled: argv.shouldOptimize,
         artifactsDir: argv.artifactsDir,
-        specifiedContracts: getContractsSetFromList(argv.contracts),
+        contracts: argv.contracts === DEFAULT_CONTRACTS_LIST ? DEFAULT_CONTRACTS_LIST : argv.contracts.split(SEPARATOR),
     };
     await commands.compileAsync(compilerOpts);
 
@@ -58,91 +54,79 @@ async function onDeployCommandAsync(argv: CliOptions): Promise<void> {
         from: argv.account,
     };
     const deployerOpts: DeployerOptions = {
-        artifactsDir: argv.artifactsDir,
+        artifactsDir: argv.artifactsDir || DEFAULT_ARTIFACTS_DIR,
         jsonrpcUrl: argv.jsonrpcUrl,
         networkId,
         defaults,
     };
-    const deployerArgsString = argv.args as string;
-    const deployerArgs = deployerArgsString.split(',');
+    const deployerArgsString = argv.constructorArgs as string;
+    const deployerArgs = deployerArgsString.split(SEPARATOR);
     await commands.deployAsync(argv.contract as string, deployerArgs, deployerOpts);
 }
 /**
- * Creates a set of contracts to compile.
- * @param contracts Comma separated list of contracts to compile
- */
-function getContractsSetFromList(contracts: string): Set<string> {
-    const specifiedContracts = new Set();
-    if (contracts === '*') {
-        return new Set(['*']);
-    }
-    const contractsArray = contracts.split(',');
-    _.forEach(contractsArray, contractName => {
-        specifiedContracts.add(contractName);
-    });
-    return specifiedContracts;
-}
-/**
- * Provides extra required options for deploy command.
+ * Adds additional required options for when the user is calling the deploy command.
  * @param yargsInstance yargs instance provided in builder function callback.
  */
 function deployCommandBuilder(yargsInstance: any) {
     return yargsInstance
-        .option('contract', {
-            type: 'string',
-            description: 'name of contract to deploy, exluding .sol extension',
-        })
-        .option('args', {
-            type: 'string',
-            description: 'comma separated list of constructor args to deploy contract with',
-        })
-        .demandOption(['contract', 'args'])
-        .help().argv;
-}
-
-(() => {
-    const identityCommandBuilder = _.identity;
-    return yargs
-        .option('contracts-dir', {
-            type: 'string',
-            default: DEFAULT_CONTRACTS_DIR,
-            description: 'path of contracts directory to compile',
-        })
         .option('network-id', {
             type: 'number',
             default: DEFAULT_NETWORK_ID,
             description: 'mainnet=1, kovan=42, testrpc=50',
         })
-        .option('should-optimize', {
-            type: 'boolean',
-            default: DEFAULT_OPTIMIZER_ENABLED,
-            description: 'enable optimizer',
+        .option('contract', {
+            type: 'string',
+            description: 'name of contract to deploy, excluding .sol extension',
         })
-        .option('artifacts-dir', {
+        .option('constructor-args', {
             type: 'string',
-            default: DEFAULT_ARTIFACTS_DIR,
-            description: 'path to write contracts artifacts to',
+            description: 'comma separated list of constructor args to deploy contract with',
         })
         .option('jsonrpc-url', {
             type: 'string',
             default: DEFAULT_JSONRPC_URL,
             description: 'url of JSON RPC',
         })
+        .option('account', {
+            type: 'string',
+            description: 'account to use for deploying contracts',
+        })
         .option('gas-price', {
             type: 'string',
             default: DEFAULT_GAS_PRICE,
             description: 'gasPrice to be used for transactions',
         })
-        .option('account', {
-            type: 'string',
-            description: 'account to use for deploying contracts',
-        })
+        .demandOption(['contract', 'args', 'account'])
+        .help().argv;
+}
+
+/**
+ * Adds additional required options for when the user is calling the compile command.
+ * @param yargsInstance yargs instance provided in builder function callback.
+ */
+function compileCommandBuilder(yargsInstance: any) {
+    return yargsInstance
         .option('contracts', {
             type: 'string',
             default: DEFAULT_CONTRACTS_LIST,
             description: 'comma separated list of contracts to compile',
         })
-        .command('compile', 'compile contracts', identityCommandBuilder, consoleReporter(onCompileCommandAsync))
+        .help().argv;
+}
+
+(() => {
+    const identityCommandBuilder = _.identity;
+    return yargs
+        .option('contracts-dir', {
+            type: 'string',
+            description: 'path of contracts directory to compile',
+        })
+        .option('artifacts-dir', {
+            type: 'string',
+            description: 'path to write contracts artifacts to',
+        })
+        .demandCommand(1)
+        .command('compile', 'compile contracts', compileCommandBuilder, consoleReporter(onCompileCommandAsync))
         .command(
             'deploy',
             'deploy a single contract with provided arguments',
diff --git a/packages/deployer/src/compiler.ts b/packages/deployer/src/compiler.ts
index a3c8004ec..e81df3c0a 100644
--- a/packages/deployer/src/compiler.ts
+++ b/packages/deployer/src/compiler.ts
@@ -6,6 +6,7 @@ import {
     FSResolver,
     NameResolver,
     NPMResolver,
+    RelativeFSResolver,
     Resolver,
     URLResolver,
 } from '@0xproject/sol-resolver';
@@ -38,11 +39,30 @@ import {
     ContractNetworks,
     ContractSourceData,
     ContractSpecificSourceData,
+    ContractVersionData,
 } from './utils/types';
 import { utils } from './utils/utils';
 
+type TYPE_ALL_FILES_IDENTIFIER = '*';
 const ALL_CONTRACTS_IDENTIFIER = '*';
+const ALL_FILES_IDENTIFIER = '*';
 const SOLC_BIN_DIR = path.join(__dirname, '..', '..', 'solc_bin');
+const DEFAULT_CONTRACTS_DIR = path.resolve('contracts');
+const DEFAULT_ARTIFACTS_DIR = path.resolve('artifacts');
+// Solc compiler settings cannot be configured from the commandline.
+// If you need this configured, please create a `compiler.json` config file
+// with your desired configurations.
+const DEFAULT_COMPILER_SETTINGS: solc.CompilerSettings = {
+    optimizer: {
+        enabled: false,
+    },
+    outputSelection: {
+        [ALL_FILES_IDENTIFIER]: {
+            [ALL_CONTRACTS_IDENTIFIER]: ['abi', 'evm.bytecode.object'],
+        },
+    },
+};
+const CONFIG_FILE = 'compiler.json';
 
 /**
  * The Compiler facilitates compiling Solidity smart contracts and saves the results
@@ -52,26 +72,28 @@ export class Compiler {
     private _resolver: Resolver;
     private _nameResolver: NameResolver;
     private _contractsDir: string;
-    private _networkId: number;
-    private _optimizerEnabled: boolean;
+    private _compilerSettings: solc.CompilerSettings;
     private _artifactsDir: string;
-    private _specifiedContracts: Set<string> = new Set();
+    private _specifiedContracts: string[] | TYPE_ALL_FILES_IDENTIFIER;
     /**
      * Instantiates a new instance of the Compiler class.
-     * @param opts Options specifying directories, network, and optimization settings.
      * @return An instance of the Compiler class.
      */
     constructor(opts: CompilerOptions) {
-        this._contractsDir = opts.contractsDir;
-        this._networkId = opts.networkId;
-        this._optimizerEnabled = opts.optimizerEnabled;
-        this._artifactsDir = opts.artifactsDir;
-        this._specifiedContracts = opts.specifiedContracts;
+        // TODO: Look for config file in parent directories if not found in current directory
+        const config: CompilerOptions = fs.existsSync(CONFIG_FILE)
+            ? JSON.parse(fs.readFileSync(CONFIG_FILE).toString())
+            : {};
+        this._contractsDir = opts.contractsDir || config.contractsDir || DEFAULT_CONTRACTS_DIR;
+        this._compilerSettings = opts.compilerSettings || config.compilerSettings || DEFAULT_COMPILER_SETTINGS;
+        this._artifactsDir = opts.artifactsDir || config.artifactsDir || DEFAULT_ARTIFACTS_DIR;
+        this._specifiedContracts = opts.contracts || config.contracts || ALL_CONTRACTS_IDENTIFIER;
         this._nameResolver = new NameResolver(path.resolve(this._contractsDir));
         const resolver = new FallthroughResolver();
         resolver.appendResolver(new URLResolver());
         const packagePath = path.resolve('');
         resolver.appendResolver(new NPMResolver(packagePath));
+        resolver.appendResolver(new RelativeFSResolver(this._contractsDir));
         resolver.appendResolver(new FSResolver());
         resolver.appendResolver(this._nameResolver);
         this._resolver = resolver;
@@ -83,13 +105,13 @@ export class Compiler {
         await createDirIfDoesNotExistAsync(this._artifactsDir);
         await createDirIfDoesNotExistAsync(SOLC_BIN_DIR);
         let contractNamesToCompile: string[] = [];
-        if (this._specifiedContracts.has(ALL_CONTRACTS_IDENTIFIER)) {
+        if (this._specifiedContracts === ALL_CONTRACTS_IDENTIFIER) {
             const allContracts = this._nameResolver.getAll();
             contractNamesToCompile = _.map(allContracts, contractSource =>
                 path.basename(contractSource.path, constants.SOLIDITY_FILE_EXTENSION),
             );
         } else {
-            contractNamesToCompile = Array.from(this._specifiedContracts.values());
+            contractNamesToCompile = this._specifiedContracts;
         }
         for (const contractNameToCompile of contractNamesToCompile) {
             await this._compileContractAsync(contractNameToCompile);
@@ -101,17 +123,18 @@ export class Compiler {
      */
     private async _compileContractAsync(contractName: string): Promise<void> {
         const contractSource = this._resolver.resolve(contractName);
+        const absoluteContractPath = path.join(this._contractsDir, contractSource.path);
         const currentArtifactIfExists = await getContractArtifactIfExistsAsync(this._artifactsDir, contractName);
-        const sourceTreeHashHex = `0x${this._getSourceTreeHash(contractSource.path).toString('hex')}`;
-
+        const sourceTreeHashHex = `0x${this._getSourceTreeHash(absoluteContractPath).toString('hex')}`;
         let shouldCompile = false;
         if (_.isUndefined(currentArtifactIfExists)) {
             shouldCompile = true;
         } else {
             const currentArtifact = currentArtifactIfExists as ContractArtifact;
-            shouldCompile =
-                currentArtifact.networks[this._networkId].optimizer_enabled !== this._optimizerEnabled ||
-                currentArtifact.networks[this._networkId].source_tree_hash !== sourceTreeHashHex;
+            const isUserOnLatestVersion = currentArtifact.schemaVersion === constants.LATEST_ARTIFACT_VERSION;
+            const didCompilerSettingsChange = !_.isEqual(currentArtifact.compiler.settings, this._compilerSettings);
+            const didSourceChange = currentArtifact.sourceTreeHashHex !== sourceTreeHashHex;
+            shouldCompile = isUserOnLatestVersion || didCompilerSettingsChange || didSourceChange;
         }
         if (!shouldCompile) {
             return;
@@ -139,30 +162,14 @@ export class Compiler {
 
         logUtils.log(`Compiling ${contractName} with Solidity v${solcVersion}...`);
         const source = contractSource.source;
-        const absoluteFilePath = contractSource.path;
         const standardInput: solc.StandardInput = {
             language: 'Solidity',
             sources: {
-                [absoluteFilePath]: {
-                    urls: [`file://${absoluteFilePath}`],
-                },
-            },
-            settings: {
-                optimizer: {
-                    enabled: this._optimizerEnabled,
-                },
-                outputSelection: {
-                    '*': {
-                        '*': [
-                            'abi',
-                            'evm.bytecode.object',
-                            'evm.bytecode.sourceMap',
-                            'evm.deployedBytecode.object',
-                            'evm.deployedBytecode.sourceMap',
-                        ],
-                    },
+                [contractSource.path]: {
+                    content: contractSource.source,
                 },
             },
+            settings: this._compilerSettings,
         };
         const compiled: solc.StandardOutput = JSON.parse(
             solcInstance.compileStandardWrapper(JSON.stringify(standardInput), importPath => {
@@ -188,34 +195,28 @@ export class Compiler {
                 });
             }
         }
-        const compiledData = compiled.contracts[absoluteFilePath][contractName];
+        const compiledData = compiled.contracts[contractSource.path][contractName];
         if (_.isUndefined(compiledData)) {
             throw new Error(
-                `Contract ${contractName} not found in ${absoluteFilePath}. Please make sure your contract has the same name as it's file name`,
+                `Contract ${contractName} not found in ${
+                    contractSource.path
+                }. Please make sure your contract has the same name as it's file name`,
             );
         }
-        const abi: ContractAbi = compiledData.abi;
-        const bytecode = `0x${compiledData.evm.bytecode.object}`;
-        const runtimeBytecode = `0x${compiledData.evm.deployedBytecode.object}`;
-        const sourceMap = compiledData.evm.bytecode.sourceMap;
-        const sourceMapRuntime = compiledData.evm.deployedBytecode.sourceMap;
-        const unresolvedSourcePaths = _.keys(compiled.sources);
-        const sources = _.map(
-            unresolvedSourcePaths,
-            unresolvedSourcePath => this._resolver.resolve(unresolvedSourcePath).path,
+        const sourceCodes = _.mapValues(
+            compiled.sources,
+            (_1, sourceFilePath) => this._resolver.resolve(sourceFilePath).source,
         );
-        const updated_at = Date.now();
-        const contractNetworkData: ContractNetworkData = {
-            solc_version: solcVersion,
-            source_tree_hash: sourceTreeHashHex,
-            optimizer_enabled: this._optimizerEnabled,
-            abi,
-            bytecode,
-            runtime_bytecode: runtimeBytecode,
-            updated_at,
-            source_map: sourceMap,
-            source_map_runtime: sourceMapRuntime,
-            sources,
+        const contractVersion: ContractVersionData = {
+            compilerOutput: compiledData,
+            sources: compiled.sources,
+            sourceCodes,
+            sourceTreeHashHex,
+            compiler: {
+                name: 'solc',
+                version: solcVersion,
+                settings: this._compilerSettings,
+            },
         };
 
         let newArtifact: ContractArtifact;
@@ -223,17 +224,14 @@ export class Compiler {
             const currentArtifact = currentArtifactIfExists as ContractArtifact;
             newArtifact = {
                 ...currentArtifact,
-                networks: {
-                    ...currentArtifact.networks,
-                    [this._networkId]: contractNetworkData,
-                },
+                ...contractVersion,
             };
         } else {
             newArtifact = {
-                contract_name: contractName,
-                networks: {
-                    [this._networkId]: contractNetworkData,
-                },
+                schemaVersion: constants.LATEST_ARTIFACT_VERSION,
+                contractName,
+                ...contractVersion,
+                networks: {},
             };
         }
 
diff --git a/packages/deployer/src/deployer.ts b/packages/deployer/src/deployer.ts
index ad05417b1..c8c3a9a06 100644
--- a/packages/deployer/src/deployer.ts
+++ b/packages/deployer/src/deployer.ts
@@ -2,6 +2,7 @@ import { AbiType, ConstructorAbi, ContractAbi, Provider, TxData } from '@0xproje
 import { logUtils } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
+import * as solc from 'solc';
 import * as Web3 from 'web3';
 
 import { Contract } from './utils/contract';
@@ -28,7 +29,20 @@ export class Deployer {
     private _artifactsDir: string;
     private _networkId: number;
     private _defaults: Partial<TxData>;
-
+    /**
+     * Gets data for current version stored in artifact.
+     * @param contractArtifact The contract artifact.
+     * @return Version specific contract data.
+     */
+    private static _getContractCompilerOutputFromArtifactIfExists(
+        contractArtifact: ContractArtifact,
+    ): solc.StandardContractOutput {
+        const compilerOutputIfExists = contractArtifact.compilerOutput;
+        if (_.isUndefined(compilerOutputIfExists)) {
+            throw new Error(`Compiler output not found in artifact for contract: ${contractArtifact.contractName}`);
+        }
+        return compilerOutputIfExists;
+    }
     /**
      * Instantiate a new instance of the Deployer class.
      * @param opts Deployer options, including either an RPC url or Provider instance.
@@ -58,10 +72,8 @@ export class Deployer {
      */
     public async deployAsync(contractName: string, args: any[] = []): Promise<Web3.ContractInstance> {
         const contractArtifactIfExists: ContractArtifact = this._loadContractArtifactIfExists(contractName);
-        const contractNetworkDataIfExists: ContractNetworkData = this._getContractNetworkDataFromArtifactIfExists(
-            contractArtifactIfExists,
-        );
-        const data = contractNetworkDataIfExists.bytecode;
+        const compilerOutput = Deployer._getContractCompilerOutputFromArtifactIfExists(contractArtifactIfExists);
+        const data = compilerOutput.evm.bytecode.object;
         const from = await this._getFromAddressAsync();
         const gas = await this._getAllowableGasEstimateAsync(data);
         const txData = {
@@ -70,7 +82,10 @@ export class Deployer {
             data,
             gas,
         };
-        const abi = contractNetworkDataIfExists.abi;
+        if (_.isUndefined(compilerOutput.abi)) {
+            throw new Error(`ABI not found in ${contractName} artifacts`);
+        }
+        const abi = compilerOutput.abi;
         const constructorAbi = _.find(abi, { type: AbiType.Constructor }) as ConstructorAbi;
         const constructorArgs = _.isUndefined(constructorAbi) ? [] : constructorAbi.inputs;
         if (constructorArgs.length !== args.length) {
@@ -138,15 +153,16 @@ export class Deployer {
         args: any[],
     ): Promise<void> {
         const contractArtifactIfExists: ContractArtifact = this._loadContractArtifactIfExists(contractName);
-        const contractNetworkDataIfExists: ContractNetworkData = this._getContractNetworkDataFromArtifactIfExists(
-            contractArtifactIfExists,
-        );
-        const abi = contractNetworkDataIfExists.abi;
+        const compilerOutput = Deployer._getContractCompilerOutputFromArtifactIfExists(contractArtifactIfExists);
+        if (_.isUndefined(compilerOutput.abi)) {
+            throw new Error(`ABI not found in ${contractName} artifacts`);
+        }
+        const abi = compilerOutput.abi;
         const encodedConstructorArgs = encoder.encodeConstructorArgsFromAbi(args, abi);
-        const newContractData = {
-            ...contractNetworkDataIfExists,
+        const newContractData: ContractNetworkData = {
             address: contractAddress,
-            constructor_args: encodedConstructorArgs,
+            links: {},
+            constructorArgs: encodedConstructorArgs,
         };
         const newArtifact = {
             ...contractArtifactIfExists,
@@ -174,18 +190,6 @@ export class Deployer {
         }
     }
     /**
-     * Gets data for current networkId stored in artifact.
-     * @param contractArtifact The contract artifact.
-     * @return Network specific contract data.
-     */
-    private _getContractNetworkDataFromArtifactIfExists(contractArtifact: ContractArtifact): ContractNetworkData {
-        const contractNetworkDataIfExists = contractArtifact.networks[this._networkId];
-        if (_.isUndefined(contractNetworkDataIfExists)) {
-            throw new Error(`Data not found in artifact for contract: ${contractArtifact.contract_name}`);
-        }
-        return contractNetworkDataIfExists;
-    }
-    /**
      * Gets the address to use for sending a transaction.
      * @return The default from address. If not specified, returns the first address accessible by web3.
      */
diff --git a/packages/deployer/src/index.ts b/packages/deployer/src/index.ts
index 186d644ef..31a75677b 100644
--- a/packages/deployer/src/index.ts
+++ b/packages/deployer/src/index.ts
@@ -1,2 +1,3 @@
 export { Deployer } from './deployer';
 export { Compiler } from './compiler';
+export { ContractArtifact, ContractNetworks } from './utils/types';
diff --git a/packages/deployer/src/utils/constants.ts b/packages/deployer/src/utils/constants.ts
index 6f9dfb994..df2ddb3b2 100644
--- a/packages/deployer/src/utils/constants.ts
+++ b/packages/deployer/src/utils/constants.ts
@@ -1,4 +1,5 @@
 export const constants = {
     SOLIDITY_FILE_EXTENSION: '.sol',
     BASE_COMPILER_URL: 'https://ethereum.github.io/solc-bin/bin/',
+    LATEST_ARTIFACT_VERSION: '2.0.0',
 };
diff --git a/packages/deployer/src/utils/types.ts b/packages/deployer/src/utils/types.ts
index a20d0f627..19c27df67 100644
--- a/packages/deployer/src/utils/types.ts
+++ b/packages/deployer/src/utils/types.ts
@@ -1,4 +1,5 @@
 import { ContractAbi, Provider, TxData } from '@0xproject/types';
+import * as solc from 'solc';
 import * as Web3 from 'web3';
 import * as yargs from 'yargs';
 
@@ -9,28 +10,40 @@ export enum AbiType {
     Fallback = 'fallback',
 }
 
-export interface ContractArtifact {
-    contract_name: string;
+export interface ContractArtifact extends ContractVersionData {
+    schemaVersion: string;
+    contractName: string;
     networks: ContractNetworks;
 }
 
+export interface ContractVersionData {
+    compiler: {
+        name: 'solc';
+        version: string;
+        settings: solc.CompilerSettings;
+    };
+    sources: {
+        [sourceName: string]: {
+            id: number;
+        };
+    };
+    sourceCodes: {
+        [sourceName: string]: string;
+    };
+    sourceTreeHashHex: string;
+    compilerOutput: solc.StandardContractOutput;
+}
+
 export interface ContractNetworks {
-    [key: number]: ContractNetworkData;
+    [networkId: number]: ContractNetworkData;
 }
 
 export interface ContractNetworkData {
-    solc_version: string;
-    optimizer_enabled: boolean;
-    source_tree_hash: string;
-    abi: ContractAbi;
-    bytecode: string;
-    runtime_bytecode: string;
-    address?: string;
-    constructor_args?: string;
-    updated_at: number;
-    source_map: string;
-    source_map_runtime: string;
-    sources: string[];
+    address: string;
+    links: {
+        [linkName: string]: string;
+    };
+    constructorArgs: string;
 }
 
 export interface SolcErrors {
@@ -42,7 +55,6 @@ export interface CliOptions extends yargs.Arguments {
     contractsDir: string;
     jsonrpcUrl: string;
     networkId: number;
-    shouldOptimize: boolean;
     gasPrice: string;
     account?: string;
     contract?: string;
@@ -50,11 +62,10 @@ export interface CliOptions extends yargs.Arguments {
 }
 
 export interface CompilerOptions {
-    contractsDir: string;
-    networkId: number;
-    optimizerEnabled: boolean;
-    artifactsDir: string;
-    specifiedContracts: Set<string>;
+    contractsDir?: string;
+    artifactsDir?: string;
+    compilerSettings?: solc.CompilerSettings;
+    contracts?: string[] | '*';
 }
 
 export interface BaseDeployerOptions {
diff --git a/packages/deployer/test/compiler_test.ts b/packages/deployer/test/compiler_test.ts
index b03ae7935..9baf433d4 100644
--- a/packages/deployer/test/compiler_test.ts
+++ b/packages/deployer/test/compiler_test.ts
@@ -18,9 +18,7 @@ describe('#Compiler', function() {
     const compilerOpts: CompilerOptions = {
         artifactsDir,
         contractsDir,
-        networkId: constants.networkId,
-        optimizerEnabled: constants.optimizerEnabled,
-        specifiedContracts: new Set(constants.specifiedContracts),
+        contracts: constants.contracts,
     };
     const compiler = new Compiler(compilerOpts);
     beforeEach((done: DoneCallback) => {
@@ -38,9 +36,8 @@ describe('#Compiler', function() {
         };
         const exchangeArtifactString = await fsWrapper.readFileAsync(exchangeArtifactPath, opts);
         const exchangeArtifact: ContractArtifact = JSON.parse(exchangeArtifactString);
-        const exchangeContractData: ContractNetworkData = exchangeArtifact.networks[constants.networkId];
         // The last 43 bytes of the binaries are metadata which may not be equivalent
-        const unlinkedBinaryWithoutMetadata = exchangeContractData.bytecode.slice(0, -86);
+        const unlinkedBinaryWithoutMetadata = exchangeArtifact.compilerOutput.evm.bytecode.object.slice(0, -86);
         const exchangeBinaryWithoutMetadata = exchange_binary.slice(0, -86);
         expect(unlinkedBinaryWithoutMetadata).to.equal(exchangeBinaryWithoutMetadata);
     });
diff --git a/packages/deployer/test/deployer_test.ts b/packages/deployer/test/deployer_test.ts
index 238624220..a8abc6454 100644
--- a/packages/deployer/test/deployer_test.ts
+++ b/packages/deployer/test/deployer_test.ts
@@ -19,9 +19,7 @@ describe('#Deployer', () => {
     const compilerOpts: CompilerOptions = {
         artifactsDir,
         contractsDir,
-        networkId: constants.networkId,
-        optimizerEnabled: constants.optimizerEnabled,
-        specifiedContracts: new Set(constants.specifiedContracts),
+        contracts: constants.contracts,
     };
     const compiler = new Compiler(compilerOpts);
     const deployerOpts = {
@@ -55,8 +53,7 @@ describe('#Deployer', () => {
             const exchangeContractData: ContractNetworkData = exchangeArtifact.networks[constants.networkId];
             const exchangeAddress = exchangeContractInstance.address;
             expect(exchangeAddress).to.not.equal(undefined);
-            expect(exchangeContractData.address).to.equal(undefined);
-            expect(exchangeContractData.constructor_args).to.equal(undefined);
+            expect(exchangeContractData).to.equal(undefined);
         });
     });
     describe('#deployAndSaveAsync', () => {
@@ -71,7 +68,7 @@ describe('#Deployer', () => {
             const exchangeContractData: ContractNetworkData = exchangeArtifact.networks[constants.networkId];
             const exchangeAddress = exchangeContractInstance.address;
             expect(exchangeAddress).to.be.equal(exchangeContractData.address);
-            expect(constructor_args).to.be.equal(exchangeContractData.constructor_args);
+            expect(constructor_args).to.be.equal(exchangeContractData.constructorArgs);
         });
     });
 });
diff --git a/packages/deployer/test/fixtures/exchange_bin.ts b/packages/deployer/test/fixtures/exchange_bin.ts
index 9fbf9bf95..914e76bf5 100644
--- a/packages/deployer/test/fixtures/exchange_bin.ts
+++ b/packages/deployer/test/fixtures/exchange_bin.ts
@@ -1,4 +1,4 @@
 export const constructor_args =
     '0x000000000000000000000000e41d2489571d322189246dafa5ebde1f4699f4980000000000000000000000008da0d80f5007ef1e431dd2127178d224e32c2ef4';
 export const exchange_binary =
-    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diff --git a/packages/deployer/test/util/constants.ts b/packages/deployer/test/util/constants.ts
index b93081a80..88d6db550 100644
--- a/packages/deployer/test/util/constants.ts
+++ b/packages/deployer/test/util/constants.ts
@@ -7,5 +7,5 @@ export const constants = {
     timeoutMs: 30000,
     zrxTokenAddress: '0xe41d2489571d322189246dafa5ebde1f4699f498',
     tokenTransferProxyAddress: '0x8da0d80f5007ef1e431dd2127178d224e32c2ef4',
-    specifiedContracts: '*',
+    contracts: '*' as '*',
 };
diff --git a/packages/dev-utils/src/coverage.ts b/packages/dev-utils/src/coverage.ts
index 67c87ec30..743573874 100644
--- a/packages/dev-utils/src/coverage.ts
+++ b/packages/dev-utils/src/coverage.ts
@@ -13,7 +13,7 @@ export const coverage = {
         return coverageSubprovider;
     },
     _getCoverageSubprovider(): CoverageSubprovider {
-        const artifactsPath = '../migrations/src/artifacts';
+        const artifactsPath = '../migrations/artifacts/1.0.0';
         const contractsPath = 'src/contracts';
         const networkId = 50;
         const defaultFromAddress = constants.TESTRPC_FIRST_ADDRESS;
diff --git a/packages/metacoin/compiler.json b/packages/metacoin/compiler.json
new file mode 100644
index 000000000..f5817e0c8
--- /dev/null
+++ b/packages/metacoin/compiler.json
@@ -0,0 +1,15 @@
+{
+    "compilerSettings": {
+        "outputSelection": {
+            "*": {
+                "*": [
+                    "abi",
+                    "evm.bytecode.object",
+                    "evm.bytecode.sourceMap",
+                    "evm.deployedBytecode.object",
+                    "evm.deployedBytecode.sourceMap"
+                ]
+            }
+        }
+    }
+}
diff --git a/packages/metacoin/package.json b/packages/metacoin/package.json
index 1ab749017..17aad0aaf 100644
--- a/packages/metacoin/package.json
+++ b/packages/metacoin/package.json
@@ -12,13 +12,13 @@
         "build": "tsc",
         "test": "run-s build run_mocha",
         "test:coverage": "SOLIDITY_COVERAGE=true run-s build run_mocha coverage:report:text coverage:report:lcov",
-        "run_mocha": "mocha lib/test/**/*.js --bail --exit",
+        "run_mocha": "mocha lib/test/**/*_test.js lib/test/global_hooks.js --bail --exit",
         "generate_contract_wrappers": "node ../abi-gen/lib/index.js --abis 'artifacts/Metacoin.json' --template ../contract_templates/contract.handlebars --partials '../contract_templates/partials/**/*.handlebars' --output src/contract_wrappers --backend ethers && prettier --write 'src/contract_wrappers/**.ts'",
         "coverage:report:text": "istanbul report text",
         "coverage:report:html": "istanbul report html && open coverage/index.html",
         "coverage:report:lcov": "istanbul report lcov",
         "test:circleci": "yarn test:coverage",
-        "compile": "node ../deployer/lib/src/cli.js compile --contracts Metacoin --contracts-dir contracts --artifacts-dir artifacts"
+        "compile": "node ../deployer/lib/src/cli.js compile"
     },
     "author": "",
     "license": "Apache-2.0",
diff --git a/packages/migrations/artifacts/1.0.0/.gitkeep b/packages/migrations/artifacts/1.0.0/.gitkeep
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/packages/migrations/artifacts/1.0.0/.gitkeep
diff --git a/packages/sol-cov/src/collect_contract_data.ts b/packages/sol-cov/src/collect_contract_data.ts
index 1d8bc7178..bb20e98be 100644
--- a/packages/sol-cov/src/collect_contract_data.ts
+++ b/packages/sol-cov/src/collect_contract_data.ts
@@ -8,25 +8,24 @@ import { ContractData } from './types';
 export const collectContractsData = (artifactsPath: string, sourcesPath: string, networkId: number) => {
     const artifactsGlob = `${artifactsPath}/**/*.json`;
     const artifactFileNames = glob.sync(artifactsGlob, { absolute: true });
-    const contractsDataIfExists: Array<ContractData | {}> = _.map(artifactFileNames, artifactFileName => {
+    const contractsData: ContractData[] = [];
+    _.forEach(artifactFileNames, artifactFileName => {
         const artifact = JSON.parse(fs.readFileSync(artifactFileName).toString());
-        const sources = artifact.networks[networkId].sources;
-        const contractName = artifact.contract_name;
+        const sources = _.keys(artifact.sources);
+        const contractName = artifact.contractName;
         // We don't compute coverage for dependencies
-        const sourceCodes = _.map(sources, (source: string) => fs.readFileSync(source).toString());
-        if (_.isUndefined(artifact.networks[networkId])) {
-            throw new Error(`No ${contractName} artifacts found for networkId ${networkId}`);
-        }
+        const sourceCodes = _.map(sources, (source: string) =>
+            fs.readFileSync(path.join(sourcesPath, source)).toString(),
+        );
         const contractData = {
             sourceCodes,
             sources,
-            sourceMap: artifact.networks[networkId].source_map,
-            sourceMapRuntime: artifact.networks[networkId].source_map_runtime,
-            runtimeBytecode: artifact.networks[networkId].runtime_bytecode,
-            bytecode: artifact.networks[networkId].bytecode,
+            bytecode: artifact.compilerOutput.evm.bytecode.object,
+            sourceMap: artifact.compilerOutput.evm.bytecode.sourceMap,
+            runtimeBytecode: artifact.compilerOutput.evm.deployedBytecode.object,
+            sourceMapRuntime: artifact.compilerOutput.evm.deployedBytecode.sourceMap,
         };
-        return contractData;
+        contractsData.push(contractData);
     });
-    const contractsData = _.filter(contractsDataIfExists, contractData => !_.isEmpty(contractData)) as ContractData[];
     return contractsData;
 };
diff --git a/packages/sol-cov/src/coverage_manager.ts b/packages/sol-cov/src/coverage_manager.ts
index 230ccc3c9..6a57d07c9 100644
--- a/packages/sol-cov/src/coverage_manager.ts
+++ b/packages/sol-cov/src/coverage_manager.ts
@@ -29,10 +29,31 @@ import {
 import { utils } from './utils';
 
 export class CoverageManager {
+    private _sourcesPath: string;
     private _traceInfos: TraceInfo[] = [];
     private _contractsData: ContractData[] = [];
     private _getContractCodeAsync: (address: string) => Promise<string>;
-    private static _getSingleFileCoverageForTrace(
+    constructor(
+        artifactsPath: string,
+        sourcesPath: string,
+        networkId: number,
+        getContractCodeAsync: (address: string) => Promise<string>,
+    ) {
+        this._getContractCodeAsync = getContractCodeAsync;
+        this._sourcesPath = sourcesPath;
+        this._contractsData = collectContractsData(artifactsPath, this._sourcesPath, networkId);
+    }
+    public appendTraceInfo(traceInfo: TraceInfo): void {
+        this._traceInfos.push(traceInfo);
+    }
+    public async writeCoverageAsync(): Promise<void> {
+        const finalCoverage = await this._computeCoverageAsync();
+        const jsonReplacer: null = null;
+        const numberOfJsonSpaces = 4;
+        const stringifiedCoverage = JSON.stringify(finalCoverage, jsonReplacer, numberOfJsonSpaces);
+        fs.writeFileSync('coverage/coverage.json', stringifiedCoverage);
+    }
+    private _getSingleFileCoverageForTrace(
         contractData: ContractData,
         coveredPcs: number[],
         pcToSourceRange: { [programCounter: number]: SourceRange },
@@ -94,11 +115,12 @@ export class CoverageManager {
             );
             statementCoverage[modifierStatementId] = isModifierCovered;
         }
+        const absoluteFileName = path.join(this._sourcesPath, fileName);
         const partialCoverage = {
-            [contractData.sources[fileIndex]]: {
+            [absoluteFileName]: {
                 ...coverageEntriesDescription,
                 l: {}, // It's able to derive it from statement coverage
-                path: fileName,
+                path: absoluteFileName,
                 f: functionCoverage,
                 s: statementCoverage,
                 b: branchCoverage,
@@ -106,31 +128,13 @@ export class CoverageManager {
         };
         return partialCoverage;
     }
-    constructor(
-        artifactsPath: string,
-        sourcesPath: string,
-        networkId: number,
-        getContractCodeAsync: (address: string) => Promise<string>,
-    ) {
-        this._getContractCodeAsync = getContractCodeAsync;
-        this._contractsData = collectContractsData(artifactsPath, sourcesPath, networkId);
-    }
-    public appendTraceInfo(traceInfo: TraceInfo): void {
-        this._traceInfos.push(traceInfo);
-    }
-    public async writeCoverageAsync(): Promise<void> {
-        const finalCoverage = await this._computeCoverageAsync();
-        const jsonReplacer: null = null;
-        const numberOfJsonSpaces = 4;
-        const stringifiedCoverage = JSON.stringify(finalCoverage, jsonReplacer, numberOfJsonSpaces);
-        fs.writeFileSync('coverage/coverage.json', stringifiedCoverage);
-    }
     private async _computeCoverageAsync(): Promise<Coverage> {
         const collector = new Collector();
         for (const traceInfo of this._traceInfos) {
             if (traceInfo.address !== constants.NEW_CONTRACT) {
                 // Runtime transaction
-                const runtimeBytecode = (traceInfo as TraceInfoExistingContract).runtimeBytecode;
+                let runtimeBytecode = (traceInfo as TraceInfoExistingContract).runtimeBytecode;
+                runtimeBytecode = utils.removeHexPrefix(runtimeBytecode);
                 const contractData = _.find(this._contractsData, { runtimeBytecode }) as ContractData;
                 if (_.isUndefined(contractData)) {
                     throw new Error(`Transaction to an unknown address: ${traceInfo.address}`);
@@ -144,7 +148,7 @@ export class CoverageManager {
                     contractData.sources,
                 );
                 for (let fileIndex = 0; fileIndex < contractData.sources.length; fileIndex++) {
-                    const singleFileCoverageForTrace = CoverageManager._getSingleFileCoverageForTrace(
+                    const singleFileCoverageForTrace = this._getSingleFileCoverageForTrace(
                         contractData,
                         traceInfo.coveredPcs,
                         pcToSourceRange,
@@ -154,7 +158,8 @@ export class CoverageManager {
                 }
             } else {
                 // Contract creation transaction
-                const bytecode = (traceInfo as TraceInfoNewContract).bytecode;
+                let bytecode = (traceInfo as TraceInfoNewContract).bytecode;
+                bytecode = utils.removeHexPrefix(bytecode);
                 const contractData = _.find(this._contractsData, contractDataCandidate =>
                     bytecode.startsWith(contractDataCandidate.bytecode),
                 ) as ContractData;
@@ -170,7 +175,7 @@ export class CoverageManager {
                     contractData.sources,
                 );
                 for (let fileIndex = 0; fileIndex < contractData.sources.length; fileIndex++) {
-                    const singleFileCoverageForTrace = CoverageManager._getSingleFileCoverageForTrace(
+                    const singleFileCoverageForTrace = this._getSingleFileCoverageForTrace(
                         contractData,
                         traceInfo.coveredPcs,
                         pcToSourceRange,
diff --git a/packages/sol-cov/src/utils.ts b/packages/sol-cov/src/utils.ts
index f155043a1..d970c42ee 100644
--- a/packages/sol-cov/src/utils.ts
+++ b/packages/sol-cov/src/utils.ts
@@ -4,6 +4,10 @@ export const utils = {
     compareLineColumn(lhs: LineColumn, rhs: LineColumn): number {
         return lhs.line !== rhs.line ? lhs.line - rhs.line : lhs.column - rhs.column;
     },
+    removeHexPrefix(hex: string): string {
+        const hexPrefix = '0x';
+        return hex.startsWith(hexPrefix) ? hex.slice(hexPrefix.length) : hex;
+    },
     isRangeInside(childRange: SingleFileSourceRange, parentRange: SingleFileSourceRange): boolean {
         return (
             utils.compareLineColumn(parentRange.start, childRange.start) <= 0 &&
diff --git a/packages/sol-resolver/src/index.ts b/packages/sol-resolver/src/index.ts
index cd6ec42ec..a86053259 100644
--- a/packages/sol-resolver/src/index.ts
+++ b/packages/sol-resolver/src/index.ts
@@ -3,6 +3,7 @@ export { FallthroughResolver } from './resolvers/fallthrough_resolver';
 export { URLResolver } from './resolvers/url_resolver';
 export { NPMResolver } from './resolvers/npm_resolver';
 export { FSResolver } from './resolvers/fs_resolver';
+export { RelativeFSResolver } from './resolvers/relative_fs_resolver';
 export { NameResolver } from './resolvers/name_resolver';
 export { EnumerableResolver } from './resolvers/enumerable_resolver';
 export { Resolver } from './resolvers/resolver';
diff --git a/packages/sol-resolver/src/resolvers/name_resolver.ts b/packages/sol-resolver/src/resolvers/name_resolver.ts
index 6849b7610..76bed802e 100644
--- a/packages/sol-resolver/src/resolvers/name_resolver.ts
+++ b/packages/sol-resolver/src/resolvers/name_resolver.ts
@@ -18,7 +18,8 @@ export class NameResolver extends EnumerableResolver {
         const onFile = (filePath: string) => {
             const contractName = path.basename(filePath, SOLIDITY_FILE_EXTENSION);
             if (contractName === lookupContractName) {
-                const source = fs.readFileSync(filePath).toString();
+                const absoluteContractPath = path.join(this._contractsDir, filePath);
+                const source = fs.readFileSync(absoluteContractPath).toString();
                 contractSource = {
                     source,
                     path: filePath,
@@ -35,7 +36,8 @@ export class NameResolver extends EnumerableResolver {
         const contractSources: ContractSource[] = [];
         const onFile = (filePath: string) => {
             const contractName = path.basename(filePath, SOLIDITY_FILE_EXTENSION);
-            const source = fs.readFileSync(filePath).toString();
+            const absoluteContractPath = path.join(this._contractsDir, filePath);
+            const source = fs.readFileSync(absoluteContractPath).toString();
             const contractSource = {
                 source,
                 path: filePath,
@@ -54,9 +56,10 @@ export class NameResolver extends EnumerableResolver {
             throw new Error(`No directory found at ${dirPath}`);
         }
         for (const fileName of dirContents) {
-            const entryPath = path.join(dirPath, fileName);
-            const isDirectory = fs.lstatSync(entryPath).isDirectory();
-            const isComplete = isDirectory ? this._traverseContractsDir(entryPath, onFile) : onFile(entryPath);
+            const absoluteEntryPath = path.join(dirPath, fileName);
+            const isDirectory = fs.lstatSync(absoluteEntryPath).isDirectory();
+            const entryPath = path.relative(this._contractsDir, absoluteEntryPath);
+            const isComplete = isDirectory ? this._traverseContractsDir(absoluteEntryPath, onFile) : onFile(entryPath);
             if (isComplete) {
                 return isComplete;
             }
diff --git a/packages/sol-resolver/src/resolvers/relative_fs_resolver.ts b/packages/sol-resolver/src/resolvers/relative_fs_resolver.ts
new file mode 100644
index 000000000..2317ede83
--- /dev/null
+++ b/packages/sol-resolver/src/resolvers/relative_fs_resolver.ts
@@ -0,0 +1,26 @@
+import * as fs from 'fs';
+import * as path from 'path';
+
+import { ContractSource } from '../types';
+
+import { Resolver } from './resolver';
+
+export class RelativeFSResolver extends Resolver {
+    private _contractsDir: string;
+    constructor(contractsDir: string) {
+        super();
+        this._contractsDir = contractsDir;
+    }
+    // tslint:disable-next-line:prefer-function-over-method
+    public resolveIfExists(importPath: string): ContractSource | undefined {
+        const filePath = path.join(this._contractsDir, importPath);
+        if (fs.existsSync(filePath)) {
+            const fileContent = fs.readFileSync(filePath).toString();
+            return {
+                source: fileContent,
+                path: importPath,
+            };
+        }
+        return undefined;
+    }
+}
diff --git a/packages/typescript-typings/types/solc/index.d.ts b/packages/typescript-typings/types/solc/index.d.ts
index b20f9b2ff..5a87ac267 100644
--- a/packages/typescript-typings/types/solc/index.d.ts
+++ b/packages/typescript-typings/types/solc/index.d.ts
@@ -59,32 +59,33 @@ declare module 'solc' {
         | 'evm.gasEstimates'
         | 'ewasm.wast'
         | 'ewasm.wasm';
+    export interface CompilerSettings {
+        remappings?: string[];
+        optimizer?: {
+            enabled: boolean;
+            runs?: number;
+        };
+        evmVersion?: 'homestead' | 'tangerineWhistle' | 'spuriousDragon' | 'byzantium' | 'constantinople';
+        metadata?: {
+            useLiteralContent: true;
+        };
+        libraries?: {
+            [fileName: string]: {
+                [libName: string]: string;
+            };
+        };
+        outputSelection: {
+            [fileName: string]: {
+                [contractName: string]: OutputField[];
+            };
+        };
+    }
     export interface StandardInput {
         language: 'Solidity' | 'serpent' | 'lll' | 'assembly';
         sources: {
             [fileName: string]: Source;
         };
-        settings: {
-            remappings?: string[];
-            optimizer?: {
-                enabled: boolean;
-                runs?: number;
-            };
-            evmVersion?: 'homestead' | 'tangerineWhistle' | 'spuriousDragon' | 'byzantium' | 'constantinople';
-            metadata?: {
-                useLiteralContent: true;
-            };
-            libraries?: {
-                [fileName: string]: {
-                    [libName: string]: string;
-                };
-            };
-            outputSelection: {
-                [fileName: string]: {
-                    [contractName: string]: OutputField[];
-                };
-            };
-        };
+        settings: CompilerSettings;
     }
     export type ErrorType =
         | 'JSONError'
@@ -114,6 +115,19 @@ declare module 'solc' {
         formattedMessage?: string;
     }
     import { ContractAbi } from '@0xproject/types';
+    export interface StandardContractOutput {
+        abi: ContractAbi;
+        evm: {
+            bytecode: {
+                object: string;
+                sourceMap: string;
+            };
+            deployedBytecode: {
+                object: string;
+                sourceMap: string;
+            };
+        };
+    }
     export interface StandardOutput {
         errors: Error[];
         sources: {
@@ -125,19 +139,7 @@ declare module 'solc' {
         };
         contracts: {
             [fileName: string]: {
-                [contractName: string]: {
-                    abi: ContractAbi;
-                    evm: {
-                        bytecode: {
-                            object: string;
-                            sourceMap: string;
-                        };
-                        deployedBytecode: {
-                            object: string;
-                            sourceMap: string;
-                        };
-                    };
-                };
+                [contractName: string]: StandardContractOutput;
             };
         };
     }