Disable Symbol typeof transform (#5278)

gaearon · web-flow · commit 449a812b1abd · 2018-10-03T20:04:33.000+01:00
diff --git a/packages/babel-preset-react-app/create.js b/packages/babel-preset-react-app/create.js
@@ -82,6 +82,8 @@ module.exports = function(api, opts, env) {
           useBuiltIns: false,
           // Do not transform modules to CJS
           modules: false,
+          // Exclude transforms that make all code slower
+          exclude: ['transform-typeof-symbol'],
         },
       ],
       [
diff --git a/packages/babel-preset-react-app/dependencies.js b/packages/babel-preset-react-app/dependencies.js
@@ -76,6 +76,8 @@ module.exports = function(api, opts) {
           },
           // Do not transform modules to CJS
           modules: false,
+          // Exclude transforms that make all code slower
+          exclude: ['transform-typeof-symbol'],
         },
       ],
       (isEnvProduction || isEnvDevelopment) && [
@@ -95,6 +97,8 @@ module.exports = function(api, opts) {
           useBuiltIns: false,
           // Do not transform modules to CJS
           modules: false,
+          // Exclude transforms that make all code slower
+          exclude: ['transform-typeof-symbol'],
         },
       ],
     ].filter(Boolean),

Original file line number	Diff line number	Diff line change
`@@ -82,6 +82,8 @@ module.exports = function(api, opts, env) {`
`82`	`82`	`useBuiltIns: false,`
`83`	`83`	`// Do not transform modules to CJS`
`84`	`84`	`modules: false,`
	`85`	`+ // Exclude transforms that make all code slower`
	`86`	`+ exclude: ['transform-typeof-symbol'],`
`85`	`87`	`},`
`86`	`88`	`],`
`87`	`89`	`[`