Use error.message to set the description property of a nested error payload
#125
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facebook-github-bot
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…in payload With RN 0.52, when there was a redbox due to a syntax error in a source file (with regular, non-delta bundler), the redbox would say just "No message provided". The JSON that Metro sent to RN did not include a "message" field because `JSON.stringify(error)` does not include `message`. Test Plan: Add a syntax error to one of the files in RNTester's JS and load the RNTester app (from RN master). See that the redbox now says there was a transform error with info about where the syntax error is. Also tested adding a syntax error with HMR enabled and saw that the error `message` field was set in the payload as expected. Also added a Jest test to Server-test.js.
…or payload
**Summary**
Metro reports errors using a JSON payload that has an `errors` array. Each item in this array has a `description` field. For transform errors, this field was set using the value in `error.description` -- however, JS Error objects only have a `message` field. (Grepping the Metro code, no errors (except in one test) ever get a `description` field.) This commit uses `error.message` instead of `error.description` when creating JSON payloads.
```
$ git grep description -- 'packages/**/*.js'
packages/metro/src/JSTransformer/__tests__/Transformer-test.js: babelError.description = message;
packages/metro/src/lib/formatBundlingError.js: description: string,
packages/metro/src/lib/formatBundlingError.js:): {type: string, message: string, errors: Array<{description: string}>} {
packages/metro/src/lib/formatBundlingError.js: errors: [{description: message}],
packages/metro/src/lib/formatBundlingError.js: description: error.message,
packages/metro/src/node-haste/__tests__/Module-test.js: description: "A require('foo') story",
```
**Test Plan**
Added a unit test to check that the description field is set for transform errors (with the delta bundler).
Also in a test RN app, inspected the error payload that is received by RN when there's a syntax error with HMR turned on and verified that `data.body.errors[0].description` was set.
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@mjesun This is one place (the last place, I believe) where |
rafeca
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Jan 16, 2018
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Depends on #124.
Summary
Metro reports errors using a JSON payload that has an
errorsarray. Each item in this array has adescriptionfield. For transform errors, this field was set using the value inerror.description-- however, JS Error objects only have amessagefield. (Grepping the Metro code, no errors (except in one test) ever get adescriptionfield.) This commit useserror.messageinstead oferror.descriptionwhen creating JSON payloads.Test Plan
Added a unit test to check that the description field is set for transform errors (with the delta bundler).
Also in a test RN app, inspected the error payload that is received by RN when there's a syntax error with HMR turned on and verified that
data.body.errors[0].descriptionwas set.