Add deno.arch/deno.platform (#773)

8 files changed, 82 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 9ea56582a..a1ffc750f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -71,6 +71,7 @@ ts_sources = [
   "js/make_temp_dir.ts",
   "js/mock_builtin.js",
   "js/os.ts",
+  "js/platform.ts",
   "js/plugins.d.ts",
   "js/read_file.ts",
   "js/remove.ts",
diff --git a/js/deno.ts b/js/deno.ts
index 7d52441ec..9be05e916 100644
--- a/js/deno.ts
+++ b/js/deno.ts
@@ -12,4 +12,5 @@ export { symlinkSync, symlink } from "./symlink";
 export { writeFileSync, writeFile } from "./write_file";
 export { ErrorKind, DenoError } from "./errors";
 export { libdeno } from "./libdeno";
+export { arch, platform } from "./platform";
 export const argv: string[] = [];
diff --git a/js/platform.ts b/js/platform.ts
new file mode 100644
index 000000000..26fc317a1
--- /dev/null
+++ b/js/platform.ts
@@ -0,0 +1,5 @@
+// Dummy. Injected in rollup.config.js
+import { DenoArch, DenoPlatform } from "./types";
+
+export const arch: DenoArch = "unknown";
+export const platform: DenoPlatform = "unknown";
diff --git a/js/platform_test.ts b/js/platform_test.ts
new file mode 100644
index 000000000..80a1d9325
--- /dev/null
+++ b/js/platform_test.ts
@@ -0,0 +1,9 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import { test, assert } from "./test_util.ts";
+import * as deno from "deno";
+
+test(function transformPlatformSuccess() {
+  // Make sure they are transformed
+  assert(deno.arch !== "unknown");
+  assert(deno.platform !== "unknown");
+});
diff --git a/js/types.ts b/js/types.ts
index 7af0a5201..7a7bc44d9 100644
--- a/js/types.ts
+++ b/js/types.ts
@@ -151,3 +151,29 @@ declare global {
     stackTraceLimit: number;
   }
 }
+
+// Based on Node's arch
+export type DenoArch =
+  | "arm"
+  | "arm64"
+  | "ia32"
+  | "mips"
+  | "mipsel"
+  | "ppc"
+  | "ppc64"
+  | "s390"
+  | "s390x"
+  | "x32"
+  | "x64"
+  | "unknown";
+
+export type DenoPlatform =
+  | "aix"
+  | "darwin"
+  | "freebsd"
+  | "linux"
+  | "openbsd"
+  | "sunos"
+  | "win32"
+  | "android"
+  | "unknown";
diff --git a/js/unit_tests.ts b/js/unit_tests.ts
index f1eed319e..a535aea55 100644
--- a/js/unit_tests.ts
+++ b/js/unit_tests.ts
@@ -14,3 +14,4 @@ import "./rename_test.ts";
 import "./blob_test.ts";
 import "./timers_test.ts";
 import "./symlink_test.ts";
+import "./platform_test.ts";
diff --git a/package.json b/package.json
index fe00a2916..31f176aa6 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
     "@types/text-encoding": "0.0.33",
     "base64-js": "^1.3.0",
     "flatbuffers": "^1.9.0",
+    "magic-string": "^0.22.5",
     "prettier": "^1.14.0",
     "rollup": "^0.63.2",
     "rollup-plugin-alias": "^1.4.0",
diff --git a/rollup.config.js b/rollup.config.js
index d5574a7d5..2fdaee08c 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -7,8 +7,10 @@ import nodeResolve from "rollup-plugin-node-resolve";
 import typescriptPlugin from "rollup-plugin-typescript2";
 import { createFilter } from "rollup-pluginutils";
 import typescript from "typescript";
+import MagicString from "magic-string";
 
 const mockPath = path.join(__dirname, "js", "mock_builtin.js");
+const platformPath = path.join(__dirname, "js", "platform.ts");
 const tsconfig = path.join(__dirname, "tsconfig.json");
 const typescriptPath = `${
   process.env.BASEPATH
@@ -78,6 +80,37 @@ function strings({ include, exclude } = {}) {
   };
 }
 
+// Inject deno.arch/deno.platform from Node's process.arch/process.platform
+function platform({ include, exclude } = {}) {
+  if (!include) {
+    throw new Error("include option must be passed");
+  }
+
+  const filter = createFilter(include, exclude);
+
+  return {
+    name: "platform",
+    /**
+     * @param {any} _code
+     * @param {string} id
+     */
+    transform(_code, id) {
+      if (filter(id)) {
+        // Adapted from https://github.com/rollup/rollup-plugin-inject/blob/master/src/index.js
+        const magicString = new MagicString(`
+import { DenoArch, DenoPlatform } from "./types";
+export const arch: DenoArch = "${process.arch}";
+export const platform: DenoPlatform = "${process.platform}";`);
+        // arch and platform comes from Node
+        return {
+          code: magicString.toString(),
+          map: magicString.generateMap()
+        };
+      }
+    }
+  };
+}
+
 // This plugin resolves at bundle time any generated resources that are
 // in the build path under `gen` and specified with a MID starting with `gen/`.
 // The plugin assumes that the MID needs to have the `.ts` extension appended.
@@ -104,6 +137,11 @@ export default function makeConfig(commandOptions) {
     },
 
     plugins: [
+      // inject platform and arch from Node
+      platform({
+        include: [platformPath]
+      }),
+
       // would prefer to use `rollup-plugin-virtual` to inject the empty module, but there
       // is an issue with `rollup-plugin-commonjs` which causes errors when using the
       // virtual plugin (see: rollup/rollup-plugin-commonjs#315), this means we have to use