Fixes #97: SQLite is now async, optimized, tests

plugos/sqlite/deno-sqlite/browser/mod.ts

@@ -0,0 +1,38 @@
+import { DB } from "../src/db.ts";
+import { loadFile, writeFile } from "./vfs.js";
+import { compile, instantiateBrowser } from "../build/sqlite.js";
+
+export { SqliteError } from "../src/error.ts";
+export { Status } from "../src/constants.ts";
+
+const hasCompiled = compile();
+
+/**
+ * Opens a database with the given name. If `file` is
+ * not provided or `:memory:`, an in-memory database
+ * is returned which will not persist after the database
+ * is closed.
+ */
+export async function open(file?: string): Promise<DB> {
+  if (file != null && file !== ":memory:") await loadFile(file);
+  await hasCompiled;
+  await instantiateBrowser();
+  return new DB(file);
+}
+
+/**
+ * Overwrite a given file with arbitrary data. This can be used
+ * to import a database which can later be opened.
+ */
+export async function write(file: string, data: Uint8Array): Promise<void> {
+  await writeFile(file, data);
+}
+
+/**
+ * Read the data currently stored for a given file. This can be used
+ * to export a database which has been created or modified.
+ */
+export async function read(file: string): Promise<Uint8Array | null> {
+  const buffer = await loadFile(file);
+  return buffer?.toUint8Array()?.slice();
+}