add deno target

Cargo.toml

@@ -65,6 +65,7 @@ members = [
   "examples/char",
   "examples/closures",
   "examples/console_log",
+  "examples/deno",
   "examples/dom",
   "examples/duck-typed-interfaces",
   "examples/fetch",

azure-pipelines.yml

@@ -167,7 +167,7 @@ jobs:
       - script: mv _package.json package.json && npm install && rm package.json
         displayName: "run npm install"
       - script: |
-          for dir in `ls examples | grep -v README | grep -v asm.js | grep -v raytrace | grep -v without-a-bundler | grep -v websockets | grep -v webxr`; do
+          for dir in `ls examples | grep -v README | grep -v asm.js | grep -v raytrace | grep -v without-a-bundler | grep -v websockets | grep -v webxr | grep -v deno`; do
             (cd examples/$dir &&
             ln -fs ../../node_modules . &&
             npm run build -- --output-path $BUILD_ARTIFACTSTAGINGDIRECTORY/exbuild/$dir) || exit 1;
@@ -178,6 +178,16 @@ jobs:
           artifactName: examples1
           targetPath: '$(Build.ArtifactStagingDirectory)'
 
+  - job: test_deno
+    displayName: "Build and test the deno example"
+    steps:
+      - template: ci/azure-install-rust.yml
+      - script: rustup target add wasm32-unknown-unknown
+        displayName: "install wasm target"
+      - template: ci/azure-install-deno.yml
+      - script: cd examples/deno && ./build.sh && $HOME/.deno/bin/deno run --allow-read test.ts
+        displayName: "build and run deno example"
+
   - job: build_raytrace
     displayName: "Build raytrace examples"
     steps:

ci/azure-install-deno.yml

@@ -0,0 +1,3 @@
+steps:
+  - script: curl -fsSL https://deno.land/x/install/install.sh | sh
+    displayName: "install deno"

crates/cli-support/src/js/mod.rs

@@ -143,7 +143,8 @@ impl<'a> Context<'a> {
             | OutputMode::Node {
                 experimental_modules: true,
             }
-            | OutputMode::Web => {
+            | OutputMode::Web
+            | OutputMode::Deno => {
                 if contents.starts_with("function") {
                     let body = &contents[8..];
                     if export_name == definition_name {
@@ -269,6 +270,63 @@ impl<'a> Context<'a> {
         reset_indentation(&shim)
     }
 
+    // generates somthing like
+    // ```js
+    // import * as import0 from './snippets/.../inline1.js';
+    // ```,
+    //
+    // ```js
+    // const imports = {
+    //   __wbindgen_placeholder__: {
+    //     __wbindgen_throw: function(..) { .. },
+    //     ..
+    //   },
+    //   './snippets/deno-65e2634a84cc3c14/inline1.js': import0,
+    // }
+    // ```
+    fn generate_deno_imports(&self) -> (String, String) {
+        let mut imports = String::new();
+        let mut wasm_import_object = "const imports = {\n".to_string();
+
+        wasm_import_object.push_str(&format!("  {}: {{\n", crate::PLACEHOLDER_MODULE));
+
+        for (id, js) in crate::sorted_iter(&self.wasm_import_definitions) {
+            let import = self.module.imports.get(*id);
+            wasm_import_object.push_str(&format!("{}: {},\n", &import.name, js.trim()));
+        }
+
+        wasm_import_object.push_str("\t},\n");
+
+        // e.g. snippets without parameters
+        let import_modules = self
+            .module
+            .imports
+            .iter()
+            .map(|import| &import.module)
+            .filter(|module| module.as_str() != PLACEHOLDER_MODULE);
+        for (i, module) in import_modules.enumerate() {
+            imports.push_str(&format!("import * as import{} from '{}'\n", i, module));
+            wasm_import_object.push_str(&format!("  '{}': import{},", module, i))
+        }
+
+        wasm_import_object.push_str("\n};\n\n");
+
+        (imports, wasm_import_object)
+    }
+
+    fn generate_deno_wasm_loading(&self, module_name: &str) -> String {
+        // Deno removed support for .wasm imports in https://github.com/denoland/deno/pull/5135
+        // the issue for bringing it back is https://github.com/denoland/deno/issues/5609.
+        format!(
+            "const file = new URL(import.meta.url).pathname;
+            const wasmFile = file.substring(0, file.lastIndexOf(Deno.build.os === 'windows' ? '\\\\' : '/') + 1) + '{}_bg.wasm';
+            const wasmModule = new WebAssembly.Module(Deno.readFileSync(wasmFile));
+            const wasmInstance = new WebAssembly.Instance(wasmModule, imports);
+            const wasm = wasmInstance.exports;",
+            module_name
+        )
+    }
+
     /// Performs the task of actually generating the final JS module, be it
     /// `--target no-modules`, `--target web`, or for bundlers. This is the very
     /// last step performed in `finalize`.
@@ -331,6 +389,18 @@ impl<'a> Context<'a> {
                 }
             }
 
+            OutputMode::Deno => {
+                let (js_imports, wasm_import_object) = self.generate_deno_imports();
+                imports.push_str(&js_imports);
+                footer.push_str(&wasm_import_object);
+
+                footer.push_str(&self.generate_deno_wasm_loading(module_name));
+
+                if needs_manual_start {
+                    footer.push_str("wasm.__wbindgen_start();\n");
+                }
+            }
+
             // With Bundlers and modern ES6 support in Node we can simply import
             // the wasm file as if it were an ES module and let the
             // bundler/runtime take care of it.
@@ -443,7 +513,8 @@ impl<'a> Context<'a> {
             | OutputMode::Node {
                 experimental_modules: true,
             }
-            | OutputMode::Web => {
+            | OutputMode::Web
+            | OutputMode::Deno => {
                 for (module, items) in crate::sorted_iter(&self.js_imports) {
                     imports.push_str("import { ");
                     for (i, (item, rename)) in items.iter().enumerate() {
@@ -1238,27 +1309,36 @@ impl<'a> Context<'a> {
     }
 
     fn expose_text_processor(&mut self, s: &str, args: &str) -> Result<(), Error> {
-        if self.config.mode.nodejs() {
-            let name = self.import_name(&JsImport {
-                name: JsImportName::Module {
-                    module: "util".to_string(),
-                    name: s.to_string(),
-                },
-                fields: Vec::new(),
-            })?;
-            self.global(&format!("let cached{} = new {}{};", s, name, args));
-        } else if !self.config.mode.always_run_in_browser() {
-            self.global(&format!(
-                "
+        match &self.config.mode {
+            OutputMode::Node { .. } => {
+                let name = self.import_name(&JsImport {
+                    name: JsImportName::Module {
+                        module: "util".to_string(),
+                        name: s.to_string(),
+                    },
+                    fields: Vec::new(),
+                })?;
+                self.global(&format!("let cached{} = new {}{};", s, name, args));
+            }
+            OutputMode::Bundler {
+                browser_only: false,
+            } => {
+                self.global(&format!(
+                    "
                     const l{0} = typeof {0} === 'undefined' ? \
                         (0, module.require)('util').{0} : {0};\
                 ",
-                s
-            ));
-            self.global(&format!("let cached{0} = new l{0}{1};", s, args));
-        } else {
-            self.global(&format!("let cached{0} = new {0}{1};", s, args));
-        }
+                    s
+                ));
+                self.global(&format!("let cached{0} = new l{0}{1};", s, args));
+            }
+            OutputMode::Deno
+            | OutputMode::Web
+            | OutputMode::NoModules { .. }
+            | OutputMode::Bundler { browser_only: true } => {
+                self.global(&format!("let cached{0} = new {0}{1};", s, args))
+            }
+        };
 
         Ok(())
     }

crates/cli-support/src/lib.rs

@@ -74,6 +74,7 @@ enum OutputMode {
     Web,
     NoModules { global: String },
     Node { experimental_modules: bool },
+    Deno,
 }
 
 enum Input {
@@ -210,6 +211,14 @@ impl Bindgen {
         Ok(self)
     }
 
+    pub fn deno(&mut self, deno: bool) -> Result<&mut Bindgen, Error> {
+        if deno {
+            self.switch_mode(OutputMode::Deno, "--target deno")?;
+            self.encode_into(EncodeInto::Always);
+        }
+        Ok(self)
+    }
+
     pub fn no_modules_global(&mut self, name: &str) -> Result<&mut Bindgen, Error> {
         match &mut self.mode {
             OutputMode::NoModules { global } => *global = name.to_string(),
@@ -526,7 +535,8 @@ impl OutputMode {
             | OutputMode::Web
             | OutputMode::Node {
                 experimental_modules: true,
-            } => true,
+            }
+            | OutputMode::Deno => true,
             _ => false,
         }
     }
@@ -554,15 +564,6 @@ impl OutputMode {
         }
     }
 
-    fn always_run_in_browser(&self) -> bool {
-        match self {
-            OutputMode::Web => true,
-            OutputMode::NoModules { .. } => true,
-            OutputMode::Bundler { browser_only } => *browser_only,
-            _ => false,
-        }
-    }
-
     fn web(&self) -> bool {
         match self {
             OutputMode::Web => true,

crates/cli/src/bin/wasm-bindgen-test-runner/deno.rs

@@ -0,0 +1,73 @@
+use std::ffi::OsString;
+use std::fs;
+use std::path::Path;
+use std::process::Command;
+
+use anyhow::{Context, Error};
+
+use crate::node::{exec, SHARED_SETUP};
+
+pub fn execute(
+    module: &str,
+    tmpdir: &Path,
+    args: &[OsString],
+    tests: &[String],
+) -> Result<(), Error> {
+    let mut js_to_execute = format!(
+        r#"import * as wasm from "./{0}.js";
+
+        {console_override}
+
+        // global.__wbg_test_invoke = f => f();
+
+        // Forward runtime arguments. These arguments are also arguments to the
+        // `wasm-bindgen-test-runner` which forwards them to deno which we
+        // forward to the test harness. this is basically only used for test
+        // filters for now.
+        cx.args(Deno.args.slice(1));
+
+        const ok = await cx.run(tests.map(n => wasm.__wasm[n]));
+        if (!ok) Deno.exit(1);
+
+        const tests = [];
+    "#,
+        module,
+        console_override = SHARED_SETUP,
+    );
+
+    for test in tests {
+        js_to_execute.push_str(&format!("tests.push('{}')\n", test));
+    }
+
+    let js_path = tmpdir.join("run.js");
+    fs::write(&js_path, js_to_execute).context("failed to write JS file")?;
+
+    /*
+    // Augment `NODE_PATH` so things like `require("tests/my-custom.js")` work
+    // and Rust code can import from custom JS shims. This is a bit of a hack
+    // and should probably be removed at some point.
+    let path = env::var("NODE_PATH").unwrap_or_default();
+    let mut path = env::split_paths(&path).collect::<Vec<_>>();
+    path.push(env::current_dir().unwrap());
+    path.push(tmpdir.to_path_buf());
+    let extra_node_args = env::var("NODE_ARGS")
+        .unwrap_or_default()
+        .split(",")
+        .map(|s| s.to_string())
+        .filter(|s| !s.is_empty())
+        .collect::<Vec<_>>();
+    exec(
+        Command::new("node")
+            .env("NODE_PATH", env::join_paths(&path).unwrap())
+            .args(&extra_node_args)
+            .arg(&js_path)
+            .args(args),
+    )*/
+    exec(
+        Command::new("deno")
+            .arg("run")
+            .arg("--allow-read")
+            .arg(&js_path)
+            .args(args),
+    )
+}