You run yarn start or yarn dev and you see the error below? Neither running yarn install, nor using a different Node version helps?
Web Bundling complete 2068ms
./index.js
Module build failed (from ./node_modules/@expo/webpack-config/node_modules/babel-loader/lib/index.js):
TypeError: /x/index.js: (0 , _genMapping.maybeAddMapping) is not a function
at SourceMap.mark (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/source-map.ts:150:20)
at Buffer._mark (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/buffer.ts:308:16)
at Buffer._append (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/buffer.ts:281:12)
at Buffer.append (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/buffer.ts:153:10)
at Generator._append (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/printer.ts:413:15)
at Generator.word (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/printer.ts:230:10)
at Generator.ImportDeclaration (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/generators/modules.ts:239:8)
at Buffer.exactSource (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/buffer.ts:426:5)
at Generator.exactSource (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/printer.ts:354:15)
at Generator.print (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/printer.ts:686:10)
at Generator.printJoin (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/printer.ts:798:12)
at Generator.printSequence (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/printer.ts:900:10)
at Generator.Program (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/generators/base.ts:31:8)
at Generator.exactSource (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/printer.ts:348:7)
at Generator.print (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/printer.ts:686:10)
at Generator.File (/x/node_modules/@expo/webpack-config/node_modules/@babel/generator/src/generators/base.ts:11:8)Here’s an easy fix… Delete node_modules completely and run yarn install again. And now it works…
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