Add tooling to verify dependency chain

package.json

@@ -58,13 +58,17 @@
     "integration/*"
   ],
   "devDependencies": {
+    "@microsoft/api-documenter": "7.7.20",
+    "@microsoft/api-extractor": "7.7.13",
     "@types/chai": "4.2.11",
     "@types/chai-as-promised": "7.1.2",
     "@types/long": "4.0.1",
     "@types/mocha": "7.0.2",
     "@types/node": "12.12.37",
     "@types/sinon": "9.0.0",
     "@types/sinon-chai": "3.2.4",
+    "@types/tmp": "0.2.0",
+    "@types/yargs": "15.0.4",
     "@typescript-eslint/eslint-plugin": "2.30.0",
     "@typescript-eslint/eslint-plugin-tslint": "2.30.0",
     "@typescript-eslint/parser": "2.30.0",
@@ -132,9 +136,7 @@
     "typescript": "3.8.3",
     "watch": "1.0.2",
     "webpack": "4.43.0",
-    "yargs": "15.3.1",
-    "@microsoft/api-extractor": "7.7.13",
-    "@microsoft/api-documenter": "7.7.20"
+    "yargs": "15.3.1"
   },
   "husky": {
     "hooks": {

packages/firestore/exp/index.d.ts

@@ -0,0 +1,19 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export function foo(): string;
+export function bar(): string;

packages/firestore/exp/index.node.ts

@@ -0,0 +1,18 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export { foo, bar } from './src/api/foobar';

packages/firestore/exp/src/api/foobar.ts

@@ -0,0 +1,24 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export function foo(): string {
+  return bar();
+}
+
+export function bar(): string {
+  return 'bar';
+}

packages/firestore/exp/test/deps/dependencies.json

@@ -0,0 +1,23 @@
+{
+    "bar": {
+        "dependencies": {
+            "functions": [
+                "bar"
+            ],
+            "classes": [],
+            "variables": []
+        },
+        "sizeInBytes": 39
+    },
+    "foo": {
+        "dependencies": {
+            "functions": [
+                "bar",
+                "foo"
+            ],
+            "classes": [],
+            "variables": []
+        },
+        "sizeInBytes": 67
+    }
+}

packages/firestore/exp/test/deps/verify_dependencies.test.ts

@@ -0,0 +1,45 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { expect } from 'chai';
+
+import { extractDependencies } from '../../../../../scripts/exp/extract-deps.helpers';
+
+import * as dependencies from './dependencies.json';
+import * as pkg from '../../../package.json';
+import { forEach } from '../../../src/util/obj';
+
+describe('Dependencies', () => {
+  forEach(dependencies, (api, { dependencies }) => {
+    it(api, () => {
+      return extractDependencies(api, pkg.exp).then(extractedDependencies => {
+        expect(extractedDependencies.classes).to.have.members(
+          dependencies.classes,
+          'for classes'
+        );
+        expect(extractedDependencies.functions).to.have.members(
+          dependencies.functions,
+          'for functions'
+        );
+        expect(extractedDependencies.variables).to.have.members(
+          dependencies.variables,
+          'for variables'
+        );
+      });
+    });
+  });
+});

packages/firestore/externs.json

@@ -23,8 +23,8 @@
     "packages/webchannel-wrapper/src/index.d.ts",
     "packages/util/dist/src/environment.d.ts",
     "packages/firestore/src/protos/firestore_proto_api.d.ts",
-    "packages/firestore/dist/lib/src/util/error.d.ts",
-    "packages/firestore/dist/lib/src/local/indexeddb_schema.d.ts",
-    "packages/firestore/dist/lib/src/local/shared_client_state_schema.d.ts"
+    "packages/firestore/src/util/error.ts",
+    "packages/firestore/src/local/indexeddb_schema.ts",
+    "packages/firestore/src/local/shared_client_state_schema.ts"
   ]
 }

packages/firestore/package.json

@@ -7,15 +7,20 @@
   "description": "The Cloud Firestore component of the Firebase JS SDK.",
   "author": "Firebase <[email protected]> (https://firebase.google.com/)",
   "scripts": {
-    "prebuild": "tsc -d --downlevelIteration --declarationDir dist/lib --emitDeclarationOnly && tsc -m es2015 --moduleResolution node scripts/*.ts ",
+    "prebuild": "tsc -m es2015 --moduleResolution node scripts/*.ts ",
     "build": "rollup -c rollup.config.es2017.js && rollup -c rollup.config.es5.js",
     "build:deps": "lerna run --scope @firebase/'{app,firestore}' --include-dependencies build",
     "build:console": "node tools/console.build.js",
+    "build:exp": "rollup -c rollup.config.exp.js",
     "predev": "yarn prebuild",
     "dev": "rollup -c -w",
     "lint": "eslint -c .eslintrc.js '**/*.ts' --ignore-path '../../.gitignore'",
     "lint:fix": "eslint --fix -c .eslintrc.js '**/*.ts' --ignore-path '../../.gitignore'",
-    "prettier": "prettier --write '*.ts' '*.js' 'src/**/*.js' 'test/**/*.js' 'src/**/*.ts' 'test/**/*.ts'",
+    "prettier": "prettier --write '*.ts' '*.js' 'exp/**/*.ts' 'src/**/*.js' 'test/**/*.js' 'src/**/*.ts' 'test/**/*.ts'",
+    "pregendeps:exp": "yarn build:exp",
+    "gendeps:exp": "../../scripts/exp/extract-deps.sh --types ./exp/index.d.ts --bundle ./dist/exp/index.js --output ./exp/test/deps/dependencies.json",
+    "pretest:exp": "yarn build:exp",
+    "test:exp":  "TS_NODE_CACHE=NO TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' nyc --reporter lcovonly -- mocha 'exp/test/**/*.test.ts' --file exp/index.node.ts --config ../../config/mocharc.node.js",
     "test": "run-s lint test:all",
     "test:ci": "node ../../scripts/run_tests_in_ci.js",
     "test:all": "run-p test:browser test:travis test:minified",
@@ -34,6 +39,7 @@
   "browser": "dist/index.cjs.js",
   "module": "dist/index.esm.js",
   "esm2017": "dist/index.esm2017.js",
+  "exp": "dist/exp/index.js",
   "license": "Apache-2.0",
   "files": [
     "dist",

packages/firestore/rollup.config.exp.js

@@ -0,0 +1,52 @@
+/**
+ * @license
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import typescriptPlugin from 'rollup-plugin-typescript2';
+import typescript from 'typescript';
+
+import { resolveNodeExterns } from './rollup.shared';
+
+import pkg from './package.json';
+
+const defaultPlugins = [
+  typescriptPlugin({
+    typescript,
+    tsconfigOverride: {
+      compilerOptions: {
+        target: 'es2017'
+      }
+    },
+    clean: true
+  })
+];
+
+const nodeBuilds = [
+  {
+    input: './exp/index.node.ts',
+    output: {
+      file: pkg.exp,
+      format: 'es'
+    },
+    plugins: defaultPlugins,
+    external: resolveNodeExterns,
+    treeshake: {
+      tryCatchDeoptimization: false
+    }
+  }
+];
+
+export default [...nodeBuilds];

packages/firestore/scripts/extract-api.ts

@@ -32,6 +32,17 @@ function extractIdentifiersFromNodeAndChildren(
   );
 }
 
+/** Generates the "d.ts" content for `fileName`. */
+function extractTypeDeclaration(fileName: string): string {
+  let result: string;
+  const compilerOptions = { declaration: true, emitDeclarationOnly: true };
+  const host = ts.createCompilerHost(compilerOptions);
+  host.writeFile = (_: string, contents: string) => (result = contents);
+  const program = ts.createProgram([fileName], compilerOptions, host);
+  program.emit();
+  return result!;
+}
+
 /**
  * Traverses TypeScript type definition files and returns the list of referenced
  * identifiers.
@@ -41,12 +52,21 @@ export function extractPublicIdentifiers(filePaths: string[]): Set<string> {
 
   for (const filePath of filePaths) {
     const contents = fs.readFileSync(filePath, { encoding: 'UTF-8' });
-    const sourceFile = ts.createSourceFile(
+    let sourceFile = ts.createSourceFile(
       filePath,
       contents,
       ts.ScriptTarget.ES2015
     );
 
+    if (!sourceFile.isDeclarationFile) {
+      const dtsSource = extractTypeDeclaration(filePath);
+      sourceFile = ts.createSourceFile(
+        filePath.replace('.ts', '.d.ts'),
+        dtsSource,
+        ts.ScriptTarget.ES2015
+      );
+    }
+
     const identifiers = new Set<string>();
     ts.forEachChild(sourceFile, (childNode: ts.Node) =>
       extractIdentifiersFromNodeAndChildren(childNode, identifiers)