Summary:
Hi all!
I took the path to implement a custom errorHandler, to be more aligned with the rest of the code, but it may be a mistake.
I reached that point.
```bash
echo "(){}" | yarn prepack
yarn prepack v0.27.5
$ node lib/prepack-cli.js
Unexpected token (1:1) found in stdin
Error: A fatal error occurred while prepacking.
+ (full stack trace)
error Command failed with exit code 1.
```
and when srcmapIn is given but not existing:
```bash
echo "(){}" | yarn prepack -- --srcmapIn notExisting
yarn prepack v0.27.5
$ node lib/prepack-cli.js "--srcmapIn" "notExisting"
No sourcemap found at notExisting.
Unexpected token (1:1) found in stdin
+ (stack trace)
```
Finally when using files with syntax error:
```bash
yarn prepack ../notepad/test.js
yarn prepack v0.27.5
$ node lib/prepack-cli.js "../notepad/test.js"
Unexpected token (1:3) found in input file ../notepad/test.js
+ (stack trace)
```
Closes https://github.com/facebook/prepack/pull/1272
Differential Revision: D6595324
Pulled By: hermanventer
fbshipit-source-id: 6f73a15db5710585ffc9579f4487217a98f921f5
Summary:
When we catch an error in the cli and output it, we should be outputting to stderr and failing the prepack command.
Closes https://github.com/facebook/prepack/pull/1200
Reviewed By: hermanventer
Differential Revision: D6450152
Pulled By: cblappert
fbshipit-source-id: 9707ffe118b8740a36e3385998d7a71cf2c9471e
