optimize __createBinding
#168
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rbuckton
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Jan 13, 2022
Reflect microsoft/TypeScript#46997: When the binding is itself one that was created by `__createBinding`, re-use its descriptor, which avoids piling multiple levels of getters in the case of multiple levels of exports. In addition, reuse a descriptor if the bindings is marked as non-writable and non-configurable, which makes a getter not necessary. (This can be done manually if needed, even though tsc doesn't do it now.) Could be considered as a fix for #165 -- first, this PR prevents piling up multiple layers of getters. Second, it allows a hack of adding if (typeof exports === "object") exports = Object.freeze(exports); to avoid getters altogether. (And in the future, tsc could mark `const` exports as non-writable and non-configurable which would make it possible to avoid this hack.)
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Reflect microsoft/TypeScript#46997:
When the binding is itself one that was created by
__createBinding,re-use its descriptor, which avoids piling multiple levels of getters in
the case of multiple levels of exports.
In addition, reuse a descriptor if the bindings is marked as
non-writable and non-configurable, which makes a getter not
necessary. (This can be done manually if needed, even though tsc
doesn't do it now.)
Could be considered as a fix for #165 -- first, this PR prevents piling
up multiple layers of getters. Second, it allows a hack of adding
to avoid getters altogether. (And in the future, tsc could mark
constexports as non-writable and non-configurable which would make it
possible to avoid this hack.)