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Fix HMR syntax error messages (`message` instead of `description`)
Summary: The code to display HMR errors on the client was reading the `description` field from Metro payloads. Metro does not include `description` in the body of its error payloads -- only in its `body.errors` items. This commit changes RN's HMR code to show `body.message` (set consistently with facebook/metro#124) instead of the non-existent `body.description`. Open a test RN app, enable HMR, and then introduce a syntax error in an app source file. See that the redbox provides information about the syntax error instead of just saying "TransformError undefined". - facebook/metro#124 [GENERAL][ENHANCEMENT][HMR] - Fix display of syntax error messages when HMR is enabled Closes #17619 Differential Revision: D6726516 Pulled By: mjesun fbshipit-source-id: b1d1008d6f1aa8f88ff8a2aa1374724a305c773b
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