diff --git a/.circleci/config.yml b/.circleci/config.yml
index 68519101860..70ff0652971 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -42,13 +42,6 @@ jobs:
     docker:
       - image: rollupcabal/circleci-node-v10:latest
     <<: *unit_tests
-      # - run:
-      #     name: Run unit tests.
-      #     command: npm run ci:coverage
-      # - run:
-      #     name: Submit coverage data to codecov.
-      #     command: bash <(curl -s https://codecov.io/bash)
-      #     when: on_success
 
 workflows:
   version: 2
diff --git a/package-lock.json b/package-lock.json
index 4ea3a695743..72241d61456 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,9 +43,9 @@
       }
     },
     "@types/braces": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/@types/braces/-/braces-2.3.0.tgz",
-      "integrity": "sha512-A3MV5EsLHgShHoJ/XES/fQAnwNISKLrFuH9eNBZY5OkTQB7JPIwbRoExvRpDsNABvkMojnKqKWS8x0m2rLYi+A==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@types/braces/-/braces-3.0.0.tgz",
+      "integrity": "sha512-TbH79tcyi9FHwbyboOKeRachRq63mSuWYXOflsNO9ZyE5ClQ/JaozNKl+aWUq87qPNsXasXxi2AbgfwIJ+8GQw==",
       "dev": true
     },
     "@types/chokidar": {
@@ -110,9 +110,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "11.13.9",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-11.13.9.tgz",
-      "integrity": "sha512-NJ4yuEVw5podZbINp3tEqUIImMSAEHaCXRiWCf3KC32l6hIKf0iPJEh2uZdT0fELfRYk310yLmMXqy2leZQUbg=="
+      "version": "12.0.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.0.2.tgz",
+      "integrity": "sha512-5tabW/i+9mhrfEOUcLDu2xBPsHJ+X5Orqy9FKpale3SjDA17j5AEpYq5vfy3oAeAHGcvANRCO3NV3d2D6q3NiA=="
     },
     "@types/normalize-package-data": {
       "version": "2.4.0",
@@ -142,8 +142,7 @@
     "abbrev": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
-      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
-      "dev": true
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU="
     },
     "acorn": {
       "version": "6.1.1",
@@ -265,6 +264,24 @@
         }
       }
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
+      "dev": true,
+      "optional": true
+    },
+    "are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
+      }
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -362,8 +379,7 @@
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-      "dev": true
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
     },
     "base": {
       "version": "0.11.2",
@@ -430,7 +446,6 @@
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dev": true,
       "requires": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -604,6 +619,13 @@
         "upath": "^1.1.1"
       }
     },
+    "chownr": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.1.tgz",
+      "integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g==",
+      "dev": true,
+      "optional": true
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -807,8 +829,14 @@
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "dev": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
+    },
+    "console-control-strings": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
+      "dev": true,
+      "optional": true
     },
     "console-group": {
       "version": "0.3.3",
@@ -835,14 +863,14 @@
       "dev": true
     },
     "cosmiconfig": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.2.0.tgz",
-      "integrity": "sha512-nxt+Nfc3JAqf4WIWd0jXLjTJZmsPLrA9DDc4nRw2KFJQJK7DNooqSXrNI7tzLG50CF8axczly5UV929tBmh/7g==",
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.2.1.tgz",
+      "integrity": "sha512-H65gsXo1SKjf8zmrJ67eJk8aIRKV5ff2D4uKZIBZShbhGSpEmsQOPW/SKMKYhSTrqR7ufy6RP69rPogdaPh/kA==",
       "dev": true,
       "requires": {
         "import-fresh": "^2.0.0",
         "is-directory": "^0.3.1",
-        "js-yaml": "^3.13.0",
+        "js-yaml": "^3.13.1",
         "parse-json": "^4.0.0"
       },
       "dependencies": {
@@ -997,6 +1025,20 @@
         }
       }
     },
+    "delegates": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
+      "dev": true,
+      "optional": true
+    },
+    "detect-libc": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-1.0.3.tgz",
+      "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=",
+      "dev": true,
+      "optional": true
+    },
     "diff": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
@@ -1639,11 +1681,20 @@
         "universalify": "^0.1.0"
       }
     },
+    "fs-minipass": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-1.2.5.tgz",
+      "integrity": "sha512-JhBl0skXjUPCFH7x6x61gQxrKyXsxB5gcgePLZCwfyCGGsTISMoIeObbrvVeP6Xmyaudw4TT43qV2Gz+iyd2oQ==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "minipass": "^2.2.1"
+      }
+    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
-      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
-      "dev": true
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
     "fsevents": {
       "version": "1.2.9",
@@ -1656,97 +1707,15 @@
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       },
       "dependencies": {
-        "abbrev": {
-          "version": "1.1.1",
-          "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
-          "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
-          "dev": true,
-          "optional": true
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           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "dev": true,
-          "optional": true
-        },
-        "aproba": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
-          "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
-          "dev": true,
-          "optional": true
-        },
-        "are-we-there-yet": {
-          "version": "1.1.5",
-          "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
-          "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
-          "dev": true,
-          "optional": true,
-          "requires": {
-            "delegates": "^1.0.0",
-            "readable-stream": "^2.0.6"
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-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-          "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-          "dev": true,
-          "optional": true
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-        "brace-expansion": {
-          "version": "1.1.11",
-          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-          "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
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-          "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.1.tgz",
-          "integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g==",
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-          "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
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-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-          "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
-          "dev": true,
-          "optional": true
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
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@@ -1754,508 +1723,55 @@
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       "version": "1.0.3",
@@ -5707,6 +5449,13 @@
       "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
       "dev": true
     },
+    "yallist": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
+      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
+      "dev": true,
+      "optional": true
+    },
     "yargs": {
       "version": "13.2.2",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
diff --git a/package.json b/package.json
index d4fcede3b00..494ef9a2a35 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
   "homepage": "https://github.com/rollup/rollup",
   "dependencies": {
     "@types/estree": "0.0.39",
-    "@types/node": "^11.13.9",
+    "@types/node": "^12.0.2",
     "acorn": "^6.1.1"
   },
   "devDependencies": {
@@ -82,28 +82,28 @@
     "execa": "^1.0.0",
     "fixturify": "^1.2.0",
     "hash.js": "^1.1.7",
-    "husky": "^2.2.0",
+    "husky": "^2.3.0",
     "immutable": "^4.0.0-rc.12",
     "is-reference": "^1.1.2",
     "istanbul": "^0.4.5",
-    "lint-staged": "^8.1.6",
+    "lint-staged": "^8.1.7",
     "locate-character": "^2.0.5",
     "magic-string": "^0.25.2",
-    "markdownlint-cli": "^0.15.0",
+    "markdownlint-cli": "^0.16.0",
     "minimist": "^1.2.0",
     "mocha": "^6.1.4",
-    "prettier": "^1.17.0",
+    "prettier": "^1.17.1",
     "pretty-bytes": "^5.2.0",
     "pretty-ms": "^5.0.0",
     "remap-istanbul": "^0.13.0",
     "require-relative": "^0.8.7",
     "requirejs": "^2.3.6",
-    "rollup": "^1.10.1",
+    "rollup": "^1.11.3",
     "rollup-plugin-alias": "^1.5.1",
     "rollup-plugin-buble": "^0.19.6",
     "rollup-plugin-commonjs": "^9.3.4",
     "rollup-plugin-json": "^4.0.0",
-    "rollup-plugin-node-resolve": "^4.2.3",
+    "rollup-plugin-node-resolve": "^4.2.4",
     "rollup-plugin-replace": "^2.2.0",
     "rollup-plugin-string": "^3.0.0",
     "rollup-plugin-terser": "^4.0.4",
diff --git a/rollup.config.js b/rollup.config.js
index 127f73bbe24..2a2a729e573 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -84,8 +84,8 @@ export default command => {
 				alias(moduleAliases),
 				resolve(),
 				json(),
-				typescript(),
 				commonjs({ include: 'node_modules/**', namedExports: { micromatch: ['matcher'] } }),
+				typescript({include: '**/*.{ts,js}'}),
 				fixAcornEsmImport()
 			],
 			// acorn needs to be external as some plugins rely on a shared acorn instance
@@ -108,8 +108,8 @@ export default command => {
 				resolve(),
 				json(),
 				string({ include: '**/*.md' }),
-				typescript(),
-				commonjs({ include: 'node_modules/**' })
+				commonjs({ include: 'node_modules/**' }),
+				typescript({include: '**/*.{ts,js}'}),
 			],
 			external: ['fs', 'path', 'module', 'events', 'rollup', 'assert', 'os', 'util'],
 			treeshake: {
@@ -145,8 +145,8 @@ export default command => {
 						if (~id.indexOf('path.ts')) return fs.readFileSync('browser/path.ts', 'utf-8');
 					}
 				},
-				typescript(),
 				commonjs(),
+				typescript({include: '**/*.{ts,js}'}),
 				terser({ module: true, output: { comments: 'some' } })
 			],
 			treeshake: {
diff --git a/src/Chunk.ts b/src/Chunk.ts
index f27ed7e1ee5..5e0a768a029 100644
--- a/src/Chunk.ts
+++ b/src/Chunk.ts
@@ -186,11 +186,10 @@ export default class Chunk {
 			module
 		}));
 		for (const { map } of exportVariableMaps) {
-			for (const exposedVariable of Array.from(map.keys())) {
+			for (const exposedVariable of map.keys()) {
 				this.exports.add(exposedVariable);
 			}
 		}
-		const exposedVariables = Array.from(this.exports);
 		checkNextEntryModule: for (const { map, module } of exportVariableMaps) {
 			if (!this.graph.preserveModules) {
 				if (
@@ -200,14 +199,14 @@ export default class Chunk {
 				) {
 					continue checkNextEntryModule;
 				}
-				for (const exposedVariable of exposedVariables) {
+				for (const exposedVariable of this.exports) {
 					if (!map.has(exposedVariable)) {
 						continue checkNextEntryModule;
 					}
 				}
 			}
 			this.facadeModule = module;
-			for (const [variable, exportNames] of Array.from(map)) {
+			for (const [variable, exportNames] of map) {
 				for (const exportName of exportNames) {
 					this.exportNames[exportName] = variable;
 				}
@@ -260,9 +259,8 @@ export default class Chunk {
 			safeExportName: string;
 		this.exportNames = Object.create(null);
 		this.sortedExportNames = null;
-		const exportedVariables = Array.from(this.exports);
 		if (mangle) {
-			for (const variable of exportedVariables) {
+			for (const variable of this.exports) {
 				do {
 					safeExportName = toBase64(++i);
 					// skip past leading number identifiers
@@ -274,7 +272,7 @@ export default class Chunk {
 				this.exportNames[safeExportName] = variable;
 			}
 		} else {
-			for (const variable of exportedVariables) {
+			for (const variable of this.exports) {
 				i = 0;
 				safeExportName = variable.name;
 				while (this.exportNames[safeExportName]) {
@@ -361,7 +359,7 @@ export default class Chunk {
 			this.orderedModules.push(module);
 		}
 
-		for (const variable of Array.from(chunk.imports)) {
+		for (const variable of chunk.imports) {
 			if (!this.imports.has(variable) && variable.module.chunk !== this) {
 				this.imports.add(variable);
 			}
@@ -369,7 +367,7 @@ export default class Chunk {
 
 		// NB detect when exported variables are orphaned by the merge itself
 		// (involves reverse tracing dependents)
-		for (const variable of Array.from(chunk.exports)) {
+		for (const variable of chunk.exports) {
 			if (!this.exports.has(variable)) {
 				this.exports.add(variable);
 			}
@@ -475,7 +473,7 @@ export default class Chunk {
 		};
 
 		// Make sure the direct dependencies of a chunk are present to maintain execution order
-		for (const { module } of Array.from(this.imports)) {
+		for (const { module } of this.imports) {
 			const chunkOrExternal = module instanceof Module ? module.chunk : module;
 			if (this.dependencies.indexOf(chunkOrExternal) === -1) {
 				this.dependencies.push(chunkOrExternal);
@@ -863,13 +861,12 @@ export default class Chunk {
 			exportDeclaration.push({ imported: importName, reexported: exportName, needsLiveBinding });
 		}
 
-		const importsAsArray = Array.from(this.imports);
 		const renderedImports = new Set<Variable>();
 		const dependencies: ChunkDependencies = [];
 
 		for (const dep of this.dependencies) {
 			const imports: ImportSpecifier[] = [];
-			for (const variable of importsAsArray) {
+			for (const variable of this.imports) {
 				const renderedVariable =
 					variable instanceof ExportDefaultVariable && variable.referencesOriginal()
 						? variable.getOriginalVariable()
@@ -1071,7 +1068,7 @@ export default class Chunk {
 	}
 
 	private setUpModuleImports(module: Module) {
-		for (const variable of Array.from(module.imports)) {
+		for (const variable of module.imports) {
 			if (variable.module.chunk !== this) {
 				this.imports.add(variable);
 				if (variable.module instanceof Module) {
diff --git a/src/Graph.ts b/src/Graph.ts
index c45b0ed1528..0b09c0515d0 100644
--- a/src/Graph.ts
+++ b/src/Graph.ts
@@ -212,7 +212,7 @@ export default class Graph {
 			if (entryModules.length === 0) {
 				throw new Error('You must supply options.input to rollup');
 			}
-			for (const module of Array.from(this.moduleById.values())) {
+			for (const module of this.moduleById.values()) {
 				if (module instanceof Module) {
 					this.modules.push(module);
 					this.watchFiles[module.id] = true;
diff --git a/src/utils/deconflictChunk.ts b/src/utils/deconflictChunk.ts
index 71ee531193b..af5bacbae72 100644
--- a/src/utils/deconflictChunk.ts
+++ b/src/utils/deconflictChunk.ts
@@ -70,7 +70,7 @@ function deconflictImportsEsm(
 	_dependencies: (ExternalModule | Chunk)[],
 	interop: boolean
 ) {
-	for (const variable of Array.from(imports)) {
+	for (const variable of imports) {
 		const module = variable.module;
 		const name = variable.name;
 		let proposedName: string;
@@ -97,7 +97,7 @@ function deconflictImportsOther(
 	for (const chunkOrExternalModule of dependencies) {
 		chunkOrExternalModule.variableName = getSafeName(chunkOrExternalModule.variableName, usedNames);
 	}
-	for (const variable of Array.from(imports)) {
+	for (const variable of imports) {
 		const module = variable.module;
 		if (module instanceof ExternalModule) {
 			const name = variable.name;
diff --git a/test/function/samples/does-not-hang-on-missing-module/_config.js b/test/function/samples/does-not-hang-on-missing-module/_config.js
index b074580ea90..735824b97f5 100644
--- a/test/function/samples/does-not-hang-on-missing-module/_config.js
+++ b/test/function/samples/does-not-hang-on-missing-module/_config.js
@@ -12,6 +12,9 @@ module.exports = {
 		}
 	],
 	runtimeError(error) {
-		assert.equal("Cannot find module 'unlessYouCreatedThisFileForSomeReason'", error.message);
+		assert.equal(
+			error.message.split('\n')[0],
+			"Cannot find module 'unlessYouCreatedThisFileForSomeReason'"
+		);
 	}
 };
diff --git a/test/function/samples/dynamic-import-expression/_config.js b/test/function/samples/dynamic-import-expression/_config.js
index cfd95029f70..05eca696b13 100644
--- a/test/function/samples/dynamic-import-expression/_config.js
+++ b/test/function/samples/dynamic-import-expression/_config.js
@@ -24,6 +24,6 @@ module.exports = {
 		]
 	},
 	runtimeError(error) {
-		assert.equal("Cannot find module 'x/y'", error.message);
+		assert.equal(error.message.split('\n')[0], "Cannot find module 'x/y'");
 	}
 };
diff --git a/test/function/samples/dynamic-import-rewriting/_config.js b/test/function/samples/dynamic-import-rewriting/_config.js
index bd3d879f4d7..0f30dccdc16 100644
--- a/test/function/samples/dynamic-import-rewriting/_config.js
+++ b/test/function/samples/dynamic-import-rewriting/_config.js
@@ -16,6 +16,6 @@ module.exports = {
 		return exports.promise;
 	},
 	runtimeError(error) {
-		assert.equal("Cannot find module 'asdf'", error.message);
+		assert.equal(error.message.split('\n')[0], "Cannot find module 'asdf'");
 	}
 };
diff --git a/tsconfig.json b/tsconfig.json
index 5b0a0a52952..a18aaf4a32f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,8 +2,7 @@
     "compilerOptions": {
         "allowSyntheticDefaultImports": true,
         "diagnostics": true,
-        "downlevelIteration": false,
-        "lib": ["es5", "es6", "dom"],
+        "lib": ["es6", "dom"],
         "module": "commonjs",
         "noEmitOnError": true,
         "noImplicitAny": true,
@@ -12,7 +11,7 @@
         "noUnusedParameters": true,
         "pretty": true,
         "skipLibCheck": true,
-        "target": "es5"
+        "target": "es2015"
     },
     "include": [
         "typings/**/*.d.ts",