Alex Rickabaugh 4dfa71f018 feat(compiler): ability to mark an InvokeFunctionExpr as pure (#26860)
Uglify and other tree-shakers attempt to determine if the invocation
of a function is side-effectful, and remove it if so (and the result
is unused). A /*@__PURE__*/ annotation on the call site can be used
to hint to the optimizer that the invocation has no side effects and
is safe to tree-shake away.

This commit adds a 'pure' flag to the output AST function call node,
which can be used to signal to downstream emitters that a pure
annotation should be added. It also modifies ngtsc's emitter to
emit an Uglify pure annotation when this flag is set.

Testing strategy: this will be tested via its consumers, by asserting
that pure functions are translated with the correct comment.

PR Close #26860
2018-10-31 19:52:36 -04:00
2017-01-27 15:03:11 -06:00
2018-08-14 11:58:47 -07:00
2018-10-19 20:59:29 -07:00
2018-07-03 13:32:06 -07:00

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