core(lantern): move lantern metrics to lib/lantern #15875
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adamraine
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Mar 27, 2024
core/test/lib/lantern/metrics/__snapshots__/first-meaningful-paint-test.js.snap
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| * @param {{trace: LH.Trace, devtoolsLog: LH.DevtoolsLog, settings?: LH.Audit.Context['settings'], URL?: LH.Artifacts.URL}} opts | ||
| */ | ||
| function getComputationDataFromFixture({trace, devtoolsLog, settings, URL}) { | ||
| settings = settings || {}; |
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settings would always be filled out in a real scenario right? Maybe the fallback should be a copy of the default settings?
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settings and devtoolslog and URL are not real input to the planned lantern library, but they are used here as that's what Lighthouse was using. this will be addressed in a followup pr (see above TODO)
speed index is only test that is passing a settings object
adamraine
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ref #15841
This moves the meat of all the computed lantern metrics to
lib/lantern/metrics, leaving behind just a ComputedArtifact wrapper and a conversion from Lighthouse data to Lantern data.A change to note is that the Lantern metrics now do not directly call what they depend on, but instead are expected to be called with any dependent metric values they require. This change was made to remove caching of results (the purpose of Lighthouse's ComputedArtifact) from the library.