feat(browser): add browser build, tests, and sample sha256 library method

config/exports/build-tests.js

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+// this script watches the tests exported by typescript, copies them to the test directories, and modifies the require("PKG.NAME") statements to test each build
+const cpx = require("cpx");
+const separator = require("path").sep;
+const Transform = require("stream").Transform;
+const pkg = require('../../package');
+const req = (path) => 'require("' + path + '")';
+const pathUp = (levels) => Array.from(Array(levels), () => '../').join('');
+
+// replace instances of pkg.name with the proper route to the build being tested
+const makeTransform = (filePath, buildPath) => {
+  const buildPathParts = buildPath.split(separator);
+  // filePath includes build/main (-2), test/BUILD is 2 deep (+2),
+  // remove filename (-1). Total is length - 2
+  const pathToRoot = pathUp(filePath.split(separator).length - 1);
+  const placeholder = req(pkg.name);
+  return new Transform({
+    transform(chunk, encoding, done) {
+      const str = chunk.toString();
+      const parts = str.split(placeholder)
+      const newPath = req(pathToRoot + buildPath)
+      const result = parts.join(newPath);
+      this.push(result);
+      done();
+    }
+  });
+}
+
+// copy, then watch for changes to the tests
+const testsFromRoot = 'build/main/**/*.spec.js';
+const task = process.argv[2] === '-w' ? cpx.watch : cpx.copy;
+
+task(testsFromRoot, 'test/main', {
+  transform: (filePath) => makeTransform(filePath, pkg.main)
+})
+task(testsFromRoot, 'test/browser', {
+  transform: (filePath) => makeTransform(filePath, pkg.browser.replace('.js', '.cjs.js'))
+})

config/exports/rollup.config.js

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+// rollup.config.js
+import commonjs from 'rollup-plugin-commonjs';
+import nodeResolve from 'rollup-plugin-node-resolve';
+import alias from 'rollup-plugin-alias';
+
+const substituteModulePaths = {
+    'crypto': 'build/module/adapters/crypto.browser.js',
+    'hash.js': 'build/temp/hash.js'
+}
+
+export default {
+    entry: 'build/module/index.js',
+    sourceMap: true,
+    plugins: [
+        alias(substituteModulePaths),
+        nodeResolve({
+            browser: true
+        }),
+        commonjs()
+    ]
+}

config/exports/tsconfig.module.json

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+{
+  "extends": "../../tsconfig",
+  "compilerOptions": {
+    "outDir": "../../build/module",
+    "rootDir": "../../src",
+    "module": "es6",
+    "declaration": false
+  }
+}