feat: add a histrical wit-bindgen

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-js/.eslintrc.js

@@ -0,0 +1,18 @@
+module.exports = {
+    "env": {
+        "browser": true,
+        "es2021": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 12,
+        "sourceType": "module"
+    },
+    "rules": {
+      // allow this since we generate `const {} = e;` for empty structs
+      "no-empty-pattern": 0,
+      // TODO: we generate some unused functions by accident, let's fix that later
+      "no-unused-vars": 0,
+    }
+};

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-js/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "wit-bindgen-gen-js"
+version = "0.1.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+edition = "2018"
+
+[lib]
+doctest = false
+test = false
+
+[dependencies]
+wit-bindgen-gen-core = { path = '../gen-core', version = '0.1.0' }
+heck = "0.3"
+structopt = { version = "0.3", default-features = false, optional = true }
+
+[dev-dependencies]
+test-helpers = { path = '../test-helpers', features = ['wit-bindgen-gen-js'] }

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-js/build.rs

@@ -0,0 +1,4 @@
+fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+    // this build script is currently only here so OUT_DIR is set for testing.
+}

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-js/package.json

@@ -0,0 +1,9 @@
+{
+  "devDependencies": {
+    "@types/node": "^15.12.2",
+    "@typescript-eslint/eslint-plugin": "^4.27.0",
+    "@typescript-eslint/parser": "^4.27.0",
+    "eslint": "^7.28.0",
+    "typescript": "^4.3.2"
+  }
+}

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-js/tests/codegen.rs

@@ -0,0 +1,38 @@
+use std::path::Path;
+use std::process::Command;
+
+mod exports {
+    test_helpers::codegen_js_export!(
+        // ...
+        "*.wit"
+    );
+}
+
+mod imports {
+    test_helpers::codegen_js_import!(
+        "*.wit"
+
+        // This uses buffers, which we don't support in imports just yet
+        // TODO: should support this
+        "!wasi-next.wit"
+        "!host.wit"
+    );
+}
+
+fn verify(dir: &str, name: &str) {
+    let (cmd, args) = if cfg!(windows) {
+        ("cmd.exe", &["/c", "npx.cmd"] as &[&str])
+    } else {
+        ("npx", &[] as &[&str])
+    };
+
+    let status = Command::new(cmd)
+        .args(args)
+        .arg("eslint")
+        .arg("-c")
+        .arg(".eslintrc.js")
+        .arg(Path::new(dir).join(&format!("{}.js", name)))
+        .status()
+        .unwrap();
+    assert!(status.success());
+}

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-js/tests/helpers.d.ts

@@ -0,0 +1,7 @@
+export function getWasm(): Uint8Array;
+
+export interface Wasi {
+  start(instance: WebAssembly.Instance): void;
+}
+
+export function addWasiToImports(importObj: any): Wasi;

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-js/tests/helpers.js

@@ -0,0 +1,26 @@
+import { readFileSync } from 'fs';
+import { WASI } from 'wasi';
+
+export function getWasm() {
+  return readFileSync(process.argv[2]);
+}
+
+class MyWasi {
+  constructor(wasi) {
+    this.wasi = wasi;
+  }
+
+  start(instance) {
+    if ('_start' in instance.exports) {
+      this.wasi.start(instance);
+    } else {
+      this.wasi.initialize(instance);
+    }
+  }
+}
+
+export function addWasiToImports(importObj) {
+  const wasi = new WASI();
+  importObj.wasi_snapshot_preview1 = wasi.wasiImport;
+  return new MyWasi(wasi);
+}

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-js/tests/runtime.rs

@@ -0,0 +1,99 @@
+use std::env;
+use std::fs;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use wit_bindgen_gen_core::Generator;
+
+test_helpers::runtime_tests!("ts");
+
+fn execute(name: &str, wasm: &Path, ts: &Path, imports: &Path, exports: &Path) {
+    let mut dir = PathBuf::from(env!("OUT_DIR"));
+    dir.push(name);
+    drop(fs::remove_dir_all(&dir));
+    fs::create_dir_all(&dir).unwrap();
+
+    println!("OUT_DIR = {:?}", dir);
+    println!("Generating bindings...");
+    // We call `generate_all` with exports from the imports.wit file, and
+    // imports from the exports.wit wit file. It's reversed because we're
+    // implementing the host side of these APIs.
+    let imports = wit_bindgen_gen_core::wit_parser::Interface::parse_file(imports).unwrap();
+    let exports = wit_bindgen_gen_core::wit_parser::Interface::parse_file(exports).unwrap();
+    let mut files = Default::default();
+    wit_bindgen_gen_js::Opts::default()
+        .build()
+        .generate_all(&[exports], &[imports], &mut files);
+    for (file, contents) in files.iter() {
+        fs::write(dir.join(file), contents).unwrap();
+    }
+
+    let (cmd, args) = if cfg!(windows) {
+        ("cmd.exe", &["/c", "npx.cmd"] as &[&str])
+    } else {
+        ("npx", &[] as &[&str])
+    };
+
+    fs::copy(ts, dir.join("host.ts")).unwrap();
+    fs::copy("tests/helpers.d.ts", dir.join("helpers.d.ts")).unwrap();
+    fs::copy("tests/helpers.js", dir.join("helpers.js")).unwrap();
+    let config = dir.join("tsconfig.json");
+    fs::write(
+        &config,
+        format!(
+            r#"
+                {{
+                    "files": ["host.ts"],
+                    "compilerOptions": {{
+                        "module": "esnext",
+                        "target": "es2020",
+                        "strict": true,
+                        "strictNullChecks": true,
+                        "baseUrl": {0:?},
+                        "outDir": {0:?}
+                    }}
+                }}
+            "#,
+            dir,
+        ),
+    )
+    .unwrap();
+
+    run(Command::new(cmd)
+        .args(args)
+        .arg("tsc")
+        .arg("--project")
+        .arg(&config));
+
+    // Currently there's mysterious uvwasi errors creating a `WASI` on Windows.
+    // Unsure what's happening so let's ignore these tests for now since there's
+    // not much Windows-specific here anyway.
+    if cfg!(windows) {
+        return;
+    }
+
+    fs::write(dir.join("package.json"), "{\"type\":\"module\"}").unwrap();
+    let mut path = Vec::new();
+    path.push(env::current_dir().unwrap());
+    path.push(dir.clone());
+    println!("{:?}", std::env::join_paths(&path));
+    run(Command::new("node")
+        .arg("--experimental-wasi-unstable-preview1")
+        .arg(dir.join("host.js"))
+        .env("NODE_PATH", std::env::join_paths(&path).unwrap())
+        .arg(wasm));
+}
+
+fn run(cmd: &mut Command) {
+    println!("running {:?}", cmd);
+    let output = cmd.output().expect("failed to executed");
+    println!("status: {}", output.status);
+    println!(
+        "stdout:\n  {}",
+        String::from_utf8_lossy(&output.stdout).replace("\n", "\n  ")
+    );
+    println!(
+        "stderr:\n  {}",
+        String::from_utf8_lossy(&output.stderr).replace("\n", "\n  ")
+    );
+    assert!(output.status.success());
+}