rust-hello-wasm-nodejs

Cargo.toml

[package]
name = "hello-wasm"
version = "0.1.2"
authors = ["Yudu Ban <[email protected]>"]
edition = "2018"

[lib]
crate-type = ["cdylib", "rlib"]

[features]
default = ["console_error_panic_hook"]

[dependencies]
wasm-bindgen = "0.2.63"

# The `console_error_panic_hook` crate provides better debugging of panics by
# logging them with `console.error`. This is great for development, but requires
# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
# code size when deploying.
console_error_panic_hook = { version = "0.1.6", optional = true }

# `wee_alloc` is a tiny allocator for wasm that is only ~1K in code size
# compared to the default allocator's ~10K. It is slower than the default
# allocator, however.
#
# Unfortunately, `wee_alloc` requires nightly Rust when targeting wasm for now.
wee_alloc = { version = "0.4.5", optional = true }
log = "0.4.14"
wasm-bindgen-console-logger = "0.1.1"

[dev-dependencies]
wasm-bindgen-test = "0.3.13"

[profile.release]
# Tell `rustc` to optimize for small code size.
opt-level = "s"

lib.rs

mod utils;

use log::{info};
use wasm_bindgen::prelude::*;
use wasm_bindgen_console_logger::DEFAULT_LOGGER;

// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
// allocator.
#[cfg(feature = "wee_alloc")]
#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;

#[wasm_bindgen]
pub fn greet() {
    log::set_logger(&DEFAULT_LOGGER).unwrap();
    log::set_max_level(log::LevelFilter::Info);

    info!("Hello Wasm!");
}