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Fable compiler output appears in webpack profiler json output #1862

anchann opened this issue Jul 16, 2019 · 1 comment


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commented Jul 16, 2019


When trying to profile webpack's import resolution with the following command:

./node_modules/.bin/webpack --config --profile --json > stats.json

I expect to get only JSON output from webpack inside the stats.json file, but instead, fable compiler's output (fable: Compiled src/... and so forth) appears at the top of the file.

It's only a minor annoyance since this output can simply be deleted, but webpack's analysis tool ( silently fails on faulty JSON, making this bug pretty annoying to debug for new users.

Repro code

Any webpack based fable project.

Expected and actual results

stats.json file should contain valid json.

Related information

  • Fable version: 2.3.12
  • Operating system Mac OS 10.13.6

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commented Jul 23, 2019

Ah, yeah, that's true. I had a similar problem when analyzing the Webpack bundle and had to edit the generated JSON manually.

We already have a --verbose flag, so I guess we could also have a --silent flag to skip all output from Fable.

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