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Implement the local JS snippets RFC

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This commit is an implementation of [RFC 6] which enables crates to
inline local JS snippets into the final output artifact of
`wasm-bindgen`. This is accompanied with a few minor breaking changes
which are intended to be relatively minor in practice:

* The `module` attribute disallows paths starting with `./` and `../`.
  It requires paths starting with `/` to actually exist on the filesystem.
* The `--browser` flag no longer emits bundler-compatible code, but
  rather emits an ES module that can be natively loaded into a browser.

Otherwise be sure to check out [the RFC][RFC 6] for more details, and
otherwise this should implement at least the MVP version of the RFC!
Notably at this time JS snippets with `--nodejs` or `--no-modules` are
not supported and will unconditionally generate an error.

[RFC 6]: https://github.com/rustwasm/rfcs/pull/6

Closes #1311
This commit is contained in:
Alex Crichton
2019-02-25 11:11:30 -08:00
parent f161717afe
commit b762948456
32 changed files with 985 additions and 380 deletions
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4
crates/macro-support/src/lib.rs
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@ -12,8 +12,8 @@ extern crate wasm_bindgen_backend as backend;
extern crate wasm_bindgen_shared as shared;
use backend::{Diagnostic, TryToTokens};
pub use parser::BindgenAttrs;
use parser::MacroParse;
pub use crate::parser::BindgenAttrs;
use crate::parser::MacroParse;
use proc_macro2::TokenStream;
use quote::ToTokens;
use quote::TokenStreamExt;