Handle undefined expressions in treeshaking #2264
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This resolves #2223 as well. |
lukastaegert
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Jun 16, 2018
| console.log('no'); | ||
| if (z ? (console.log('a'), false) : (console.log('b'), false)) | ||
| console.log('yes'); | ||
| z = 1; |
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I'm not too happy the comma expression logs. They sure prevent the ternary operators from being tree-shaken but in the light of what you want to test, I would rather have simple direct tests such as
if (x) console.log('no');
if (!x) console.log('yes');i.e. six simple test cases which are more readable and where it is easily clear what went wrong when the test turns red. It's also easy to overlook in your test that the second value in the comma expressions are not symmetric.
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This Pull Request updates dependency [rollup](https://github.com/rollup/rollup) from `v0.60.7` to `v0.61.1` <details> <summary>Release Notes</summary> ### [`v0.61.1`](https://github.com/rollup/rollup/blob/master/CHANGELOG.md#​0611) [Compare Source](rollup/rollup@v0.61.0...697f36d) *2018-06-21* * Do not try to deconflict "undefined" ([#​2291](`rollup/rollup#2291)) * Properly track values for loop interator declarations and reassigned namespaces, add smoke test ([#​2292](`rollup/rollup#2292)) --- ### [`v0.61.0`](https://github.com/rollup/rollup/blob/master/CHANGELOG.md#​0610) [Compare Source](rollup/rollup@v0.60.7...v0.61.0) *2018-06-20* * Declare file dependencies via transform plugin hooks ([#​2259](`rollup/rollup#2259)) * Handle undefined values when evaluating conditionals ([#​2264](`rollup/rollup#2264)) * Handle known undefined properties when evaluating conditionals ([#​2265](`rollup/rollup#2265)) * Access watch events via the plugin context ([#​2261](`rollup/rollup#2261)) * Add option to suppress `__esModule` flag in output ([#​2287](`rollup/rollup#2287)) * Fix issue when re-declaring variables, track reassignments in more cases ([#​2279](`rollup/rollup#2279)) * Add VSCode debug settings ([#​2276](`rollup/rollup#2276)) --- </details> --- This PR has been generated by [Renovate Bot](https://renovatebot.com).
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Resolves #2223
This extends the
UNDEFINED_EXPRESSIONto return aundefinedliteral value which can be treeshaken.