Ben Newman 2b8834e92e Stop calling moduleDoesResolve before installing Cordova npm deps. ...

This fixes the bug where commands like `meteor add-platform ios` would
fail the first time with an error that cordova-lib could not be found,
even though we attempt to install the necessary packages if they have not
already been installed.

To make a very long story short, calling moduleDoesResolve before
installing dependencies like cordova-lib was causing Node.js to cache the
_absence_ of cordova-lib/package.json permanently in the new
packageJsonCache, which cannot be invalidated or cleared by user code:
f8f20892e9/lib/internal/modules/cjs/loader.js (L245-L255)

Although we could potentially propose a change to Node to allow the
packageJsonCache to be invalidated, a more immediate solution is simply to
avoid calling moduleDoesResolve when there's any chance the module will
not resolve. Because we still want to avoid repeatedly installing Cordova
dependencies every time we run a Cordova command, we instead check whether
the necessary dependencies are installed by examining the file system.

2020-03-11 18:01:33 -04:00

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