Add ability to require explicit load of ReactiveHTML extension #3254
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Codecov Report
@@ Coverage Diff @@
## master #3254 +/- ##
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+ Coverage 83.03% 83.14% +0.10%
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Files 195 195
Lines 25986 26006 +20
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+ Hits 21578 21623 +45
+ Misses 4408 4383 -25
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Currently any ReactiveHTML component that is imported when the panel extension is run or a server app is served for the first time will be loaded and all its JS/CSS dependencies will be embedded in the page. This isn't really a nice way to handle this problem because it creates a tension between offering helpful namespaces that include all components and reducing the number of external JS/CSS that are included in the page. To get around this we introduce the concept of a
ReactiveHTML._extension_name. This, if declared, tells Panel not to load the dependencies for this component unless it has been explicitly loaded withpn.extension(<extension_name>). This replicates the behavior we have long implemented for regular Bokeh models with dependencies we do not want to include by default and which have to be loaded using the panel extension.