diff --git a/package.json b/package.json
index 203ecfe70fd0..f952960ed511 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "lodash": "^4.17.10",
     "merge-stream": "^1.0.1",
     "output-file-sync": "^2.0.0",
-    "prettier": "^1.14.3",
+    "prettier": "^1.15.1",
     "pump": "^1.0.2",
     "rimraf": "^2.4.3",
     "rollup-plugin-babel": "^4.0.0-beta.0",
diff --git a/packages/babel-parser/src/parser/expression.js b/packages/babel-parser/src/parser/expression.js
index 60bceba8149f..84e8975e0140 100644
--- a/packages/babel-parser/src/parser/expression.js
+++ b/packages/babel-parser/src/parser/expression.js
@@ -332,8 +332,8 @@ export default class ExpressionParser extends LValParser {
         this.finishNode(
           node,
           op === tt.logicalOR ||
-          op === tt.logicalAND ||
-          op === tt.nullishCoalescing
+            op === tt.logicalAND ||
+            op === tt.nullishCoalescing
             ? "LogicalExpression"
             : "BinaryExpression",
         );
diff --git a/packages/babel-parser/src/parser/statement.js b/packages/babel-parser/src/parser/statement.js
index b19cd78f1bd3..b7203e70e3bd 100644
--- a/packages/babel-parser/src/parser/statement.js
+++ b/packages/babel-parser/src/parser/statement.js
@@ -619,8 +619,8 @@ export default class StatementParser extends ExpressionParser {
     const kind = this.state.type.isLoop
       ? "loop"
       : this.match(tt._switch)
-        ? "switch"
-        : null;
+      ? "switch"
+      : null;
     for (let i = this.state.labels.length - 1; i >= 0; i--) {
       const label = this.state.labels[i];
       if (label.statementStart === node.start) {
diff --git a/packages/babel-parser/src/plugins/typescript.js b/packages/babel-parser/src/plugins/typescript.js
index 63fd484a8988..b7a296a6d11b 100644
--- a/packages/babel-parser/src/plugins/typescript.js
+++ b/packages/babel-parser/src/plugins/typescript.js
@@ -597,8 +597,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
           const type = this.match(tt._void)
             ? "TSVoidKeyword"
             : this.match(tt._null)
-              ? "TSNullKeyword"
-              : keywordTypeFromName(this.state.value);
+            ? "TSNullKeyword"
+            : keywordTypeFromName(this.state.value);
           if (type !== undefined && this.lookahead().type !== tt.dot) {
             const node: N.TsKeywordType = this.startNode();
             this.next();
@@ -691,8 +691,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       return operator
         ? this.tsParseTypeOperator(operator)
         : this.isContextual("infer")
-          ? this.tsParseInferType()
-          : this.tsParseArrayTypeOrHigher();
+        ? this.tsParseInferType()
+        : this.tsParseArrayTypeOrHigher();
     }
 
     tsParseUnionOrIntersectionType(
@@ -1381,8 +1381,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         type === "FunctionDeclaration"
           ? "TSDeclareFunction"
           : type === "ClassMethod"
-            ? "TSDeclareMethod"
-            : undefined;
+          ? "TSDeclareMethod"
+          : undefined;
       if (bodilessType && !this.match(tt.braceL) && this.isLineTerminator()) {
         this.finishNode(node, bodilessType);
         return;
diff --git a/packages/babel-parser/src/tokenizer/index.js b/packages/babel-parser/src/tokenizer/index.js
index 33a272e7dcf0..a0ee5badf41e 100644
--- a/packages/babel-parser/src/tokenizer/index.js
+++ b/packages/babel-parser/src/tokenizer/index.js
@@ -881,10 +881,10 @@ export default class Tokenizer extends LocationParser {
       radix === 16
         ? allowedNumericSeparatorSiblings.hex
         : radix === 10
-          ? allowedNumericSeparatorSiblings.dec
-          : radix === 8
-            ? allowedNumericSeparatorSiblings.oct
-            : allowedNumericSeparatorSiblings.bin;
+        ? allowedNumericSeparatorSiblings.dec
+        : radix === 8
+        ? allowedNumericSeparatorSiblings.oct
+        : allowedNumericSeparatorSiblings.bin;
 
     let total = 0;
 
diff --git a/packages/babel-parser/test/fixtures/flow/typeapp-call/underscore_is_illegal_type_name/options.json b/packages/babel-parser/test/fixtures/flow/typeapp-call/underscore_is_illegal_type_name/options.json
index e0e70aa3ae18..85a0456eceff 100644
--- a/packages/babel-parser/test/fixtures/flow/typeapp-call/underscore_is_illegal_type_name/options.json
+++ b/packages/babel-parser/test/fixtures/flow/typeapp-call/underscore_is_illegal_type_name/options.json
@@ -1,8 +1,5 @@
 {
   "sourceType": "module",
-  "plugins": [
-    "jsx",
-    "flow"
-  ],
+  "plugins": ["jsx", "flow"],
   "throws": "Cannot overwrite reserved type _ (2:5)"
 }
diff --git a/packages/babel-parser/test/fixtures/flow/typeapp-call/underscore_is_illegal_type_param_name/options.json b/packages/babel-parser/test/fixtures/flow/typeapp-call/underscore_is_illegal_type_param_name/options.json
index 28a0ef1cd1c1..872ad2f73408 100644
--- a/packages/babel-parser/test/fixtures/flow/typeapp-call/underscore_is_illegal_type_param_name/options.json
+++ b/packages/babel-parser/test/fixtures/flow/typeapp-call/underscore_is_illegal_type_param_name/options.json
@@ -1,8 +1,5 @@
 {
   "sourceType": "module",
-  "plugins": [
-    "jsx",
-    "flow"
-  ],
+  "plugins": ["jsx", "flow"],
   "throws": "Cannot overwrite reserved type _ (2:13)"
 }
diff --git a/packages/babel-parser/test/fixtures/jsx/errors/html-comment/options.json b/packages/babel-parser/test/fixtures/jsx/errors/html-comment/options.json
index fe0b9fdeccc4..8a619bce4daf 100644
--- a/packages/babel-parser/test/fixtures/jsx/errors/html-comment/options.json
+++ b/packages/babel-parser/test/fixtures/jsx/errors/html-comment/options.json
@@ -1,4 +1,4 @@
 {
-    "sourceType": "script",
-    "plugins": ["jsx", "flow"]
-  }
+  "sourceType": "script",
+  "plugins": ["jsx", "flow"]
+}
diff --git a/packages/babel-parser/test/fixtures/typescript/decorators/type-arguments-invalid/options.json b/packages/babel-parser/test/fixtures/typescript/decorators/type-arguments-invalid/options.json
index 02d8a1c26f30..2ec42ddaf53c 100644
--- a/packages/babel-parser/test/fixtures/typescript/decorators/type-arguments-invalid/options.json
+++ b/packages/babel-parser/test/fixtures/typescript/decorators/type-arguments-invalid/options.json
@@ -1,7 +1,4 @@
 {
-  "plugins": [
-    "typescript",
-    ["decorators", { "decoratorsBeforeExport": true }]
-  ],
+  "plugins": ["typescript", ["decorators", { "decoratorsBeforeExport": true }]],
   "throws": "Unexpected token, expected \"(\" (2:0)"
 }
diff --git a/packages/babel-parser/test/fixtures/typescript/decorators/type-arguments/options.json b/packages/babel-parser/test/fixtures/typescript/decorators/type-arguments/options.json
index 714918723f91..6e9dea51e823 100644
--- a/packages/babel-parser/test/fixtures/typescript/decorators/type-arguments/options.json
+++ b/packages/babel-parser/test/fixtures/typescript/decorators/type-arguments/options.json
@@ -1,6 +1,3 @@
 {
-  "plugins": [
-    "typescript",
-    ["decorators", { "decoratorsBeforeExport": true }]
-  ]
+  "plugins": ["typescript", ["decorators", { "decoratorsBeforeExport": true }]]
 }
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-optional-invalid/options.json b/packages/babel-parser/test/fixtures/typescript/types/tuple-optional-invalid/options.json
index 92616d0020b4..15111b29065f 100644
--- a/packages/babel-parser/test/fixtures/typescript/types/tuple-optional-invalid/options.json
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-optional-invalid/options.json
@@ -1,7 +1,5 @@
 {
   "sourceType": "module",
-  "plugins": [
-    "typescript"
-  ],
+  "plugins": ["typescript"],
   "throws": "A required element cannot follow an optional element. (1:17)"
-}
\ No newline at end of file
+}
diff --git a/packages/babel-parser/test/fixtures/typescript/types/tuple-rest-invalid/options.json b/packages/babel-parser/test/fixtures/typescript/types/tuple-rest-invalid/options.json
index e2d7f7a6781e..653f8ee82760 100644
--- a/packages/babel-parser/test/fixtures/typescript/types/tuple-rest-invalid/options.json
+++ b/packages/babel-parser/test/fixtures/typescript/types/tuple-rest-invalid/options.json
@@ -1,7 +1,5 @@
 {
   "sourceType": "module",
-  "plugins": [
-    "typescript"
-  ],
+  "plugins": ["typescript"],
   "throws": "A rest element must be last in a tuple type. (1:8)"
-}
\ No newline at end of file
+}
diff --git a/packages/babel-plugin-proposal-decorators/src/transformer.js b/packages/babel-plugin-proposal-decorators/src/transformer.js
index 9ed8cd942117..621538c74cd3 100644
--- a/packages/babel-plugin-proposal-decorators/src/transformer.js
+++ b/packages/babel-plugin-proposal-decorators/src/transformer.js
@@ -82,8 +82,8 @@ function getSingleElementDefinition(path, superRef, classRef, file) {
     isMethod
       ? value(node.body, node.params, node.async, node.generator)
       : node.value
-        ? value(template.ast`{ return ${node.value} }`)
-        : prop("value", scope.buildUndefinedNode()),
+      ? value(template.ast`{ return ${node.value} }`)
+      : prop("value", scope.buildUndefinedNode()),
   ].filter(Boolean);
 
   return t.objectExpression(properties);
diff --git a/packages/babel-preset-env/scripts/build-data.js b/packages/babel-preset-env/scripts/build-data.js
index 1f4735d5bbcc..c2cf45bfb408 100644
--- a/packages/babel-preset-env/scripts/build-data.js
+++ b/packages/babel-preset-env/scripts/build-data.js
@@ -229,13 +229,15 @@ const getLowestImplementedVersion = ({ features }, env) => {
     return null;
   }
 
-  return envTests.map(str => str.replace(env, "")).reduce((a, b) => {
-    if (b === unreleasedLabelForEnv) {
-      return b;
-    }
+  return envTests
+    .map(str => str.replace(env, ""))
+    .reduce((a, b) => {
+      if (b === unreleasedLabelForEnv) {
+        return b;
+      }
 
-    return semver.lt(semver.coerce(a), semver.coerce(b)) ? b : a;
-  });
+      return semver.lt(semver.coerce(a), semver.coerce(b)) ? b : a;
+    });
 };
 
 const generateData = (environments, features) => {
diff --git a/packages/babylon/test/fixtures/es2015/yield/parameter-default-inside-arrow-inside-generator-6/options.json b/packages/babylon/test/fixtures/es2015/yield/parameter-default-inside-arrow-inside-generator-6/options.json
index 816f0c4579af..a70dd2ba957e 100644
--- a/packages/babylon/test/fixtures/es2015/yield/parameter-default-inside-arrow-inside-generator-6/options.json
+++ b/packages/babylon/test/fixtures/es2015/yield/parameter-default-inside-arrow-inside-generator-6/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "yield is not allowed in the parameters of an arrow function inside a generator (2:8)"
-}
\ No newline at end of file
+}
diff --git a/packages/babylon/test/fixtures/es2017/async-functions/await-async-function-expression-name/options.json b/packages/babylon/test/fixtures/es2017/async-functions/await-async-function-expression-name/options.json
index 848e79b9dbca..1bb312254c62 100644
--- a/packages/babylon/test/fixtures/es2017/async-functions/await-async-function-expression-name/options.json
+++ b/packages/babylon/test/fixtures/es2017/async-functions/await-async-function-expression-name/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "invalid use of await inside of an async function (1:16)"
-}
\ No newline at end of file
+}
diff --git a/packages/babylon/test/fixtures/es2017/async-functions/await-function-declaration-name-inside-async-function/options.json b/packages/babylon/test/fixtures/es2017/async-functions/await-function-declaration-name-inside-async-function/options.json
index e2abd7d95537..1eadbc9edb2f 100644
--- a/packages/babylon/test/fixtures/es2017/async-functions/await-function-declaration-name-inside-async-function/options.json
+++ b/packages/babylon/test/fixtures/es2017/async-functions/await-function-declaration-name-inside-async-function/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "invalid use of await inside of an async function (2:11)"
-}
\ No newline at end of file
+}
diff --git a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-arguments-of-async-call-inside-parameters-of-async-arrow-function/options.json b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-arguments-of-async-call-inside-parameters-of-async-arrow-function/options.json
index 662a80c579c4..f7e1f0a54d38 100644
--- a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-arguments-of-async-call-inside-parameters-of-async-arrow-function/options.json
+++ b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-arguments-of-async-call-inside-parameters-of-async-arrow-function/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "await is not allowed in the parameters of an arrow function inside an async function (2:23)"
-}
\ No newline at end of file
+}
diff --git a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-async-arrow-function/options.json b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-async-arrow-function/options.json
index a38149bc650b..ceaee67ee6b4 100644
--- a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-async-arrow-function/options.json
+++ b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-async-arrow-function/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "Unexpected token, expected \",\" (1:17)"
-}
\ No newline at end of file
+}
diff --git a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-arrow-function/options.json b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-arrow-function/options.json
index 779503d21709..3d590911be50 100644
--- a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-arrow-function/options.json
+++ b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-arrow-function/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "await is not allowed in the parameters of an arrow function inside an async function (2:7)"
-}
\ No newline at end of file
+}
diff --git a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-async-arrow-function/options.json b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-async-arrow-function/options.json
index 52eda98537e7..51430f6aa61b 100644
--- a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-async-arrow-function/options.json
+++ b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-async-arrow-function/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "await is not allowed in the parameters of an arrow function inside an async function (2:13)"
-}
\ No newline at end of file
+}
diff --git a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-function/options.json b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-function/options.json
index 7d80be8b1e9e..b260169ecd70 100644
--- a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-function/options.json
+++ b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-function/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "Unexpected token, expected \",\" (2:25)"
-}
\ No newline at end of file
+}
diff --git a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters/options.json b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters/options.json
index 1a6e14706ad1..f4af75f31164 100644
--- a/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters/options.json
+++ b/packages/babylon/test/fixtures/es2017/async-functions/await-inside-parameters/options.json
@@ -1,3 +1,3 @@
 {
   "throws": "await is not allowed in async function parameters (1:22)"
-}
\ No newline at end of file
+}
diff --git a/yarn.lock b/yarn.lock
index 1abdf1300e9a..024a6f94243b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7734,10 +7734,10 @@ preserve@^0.2.0:
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
   integrity sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks=
 
-prettier@^1.14.3:
-  version "1.14.3"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.14.3.tgz#90238dd4c0684b7edce5f83b0fb7328e48bd0895"
-  integrity sha512-qZDVnCrnpsRJJq5nSsiHCE3BYMED2OtsI+cmzIzF1QIfqm5ALf8tEJcO27zV1gKNKRPdhjO0dNWnrzssDQ1tFg==
+prettier@^1.15.1:
+  version "1.15.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.15.1.tgz#06c67106afb1b40e74b002353b2079cc7e0e67bf"
+  integrity sha512-4rgV2hyc/5Pk0XHH4VjJWHRgVjgRbpMfLQjREAhHBtyW1UvTFkjJEsueGYNYYZd9mn97K+1qv0EBwm11zoaSgA==
 
 pretty-format@^23.6.0:
   version "23.6.0"