Refactor snapshot build (#2825)

Instead of using core/snapshot_creator.rs, instead two crates are
introduced which allow building the snapshot during build.rs.

Rollup is removed and replaced with our own bundler. This removes
the Node build dependency. Modules in //js now use Deno-style imports
with file extensions, rather than Node style extensionless imports.

This improves incremental build time when changes are made to //js files
by about 40 seconds.

1 files changed, 39 insertions, 0 deletions

diff --git a/deno_typescript/amd_runtime.js b/deno_typescript/amd_runtime.js
new file mode 100644
index 000000000..fda850c5c
--- /dev/null
+++ b/deno_typescript/amd_runtime.js
@@ -0,0 +1,39 @@
+// A very very basic AMD preamble to support the output of TypeScript outFile
+// bundles.
+let require, define;
+
+(function() {
+  const modules = new Map();
+
+  function println(first, ...s) {
+    Deno.core.print(first + " " + s.map(JSON.stringify).join(" ") + "\n");
+  }
+
+  function createOrLoadModule(name) {
+    if (!modules.has(name)) {
+      const m = { name, exports: {} };
+      modules.set(name, m);
+    }
+    return modules.get(name);
+  }
+
+  require = name => {
+    return createOrLoadModule(name).exports;
+  };
+
+  define = (name, deps, factory) => {
+    const currentModule = createOrLoadModule(name);
+    const localExports = currentModule.exports;
+    const args = deps.map(dep => {
+      if (dep === "require") {
+        return require;
+      } else if (dep === "exports") {
+        return localExports;
+      } else {
+        const depModule = createOrLoadModule(dep);
+        return depModule.exports;
+      }
+    });
+    factory(...args);
+  };
+})();