Add test-exports-cf package to test using LangChain on Cloudflare Wor…

…kers

langchain/package.json

@@ -320,4 +320,4 @@
       "import": "./retrievers.js"
     }
   }
-}
+}

langchain/src/embeddings/index.ts

@@ -1,4 +1,4 @@
 export { OpenAIEmbeddings } from "./openai.js";
-export { CohereEmbeddings } from "./cohere.js";
+// export { CohereEmbeddings } from "./cohere.js";
 export { Embeddings } from "./base.js";
 export { FakeEmbeddings } from "./fake.js";

langchain/src/llms/index.ts

@@ -1,7 +1,7 @@
 export { BaseLLM, BaseLLMParams, LLM, SerializedLLM } from "./base.js";
 export { OpenAI, PromptLayerOpenAI } from "./openai.js";
 export { OpenAIChat } from "./openai-chat.js";
-export { Cohere } from "./cohere.js";
+// export { Cohere } from "./cohere.js";
 export { HuggingFaceInference } from "./hf.js";
 export { loadLLM } from "./load.js";
 export { Replicate } from "./replicate.js";

package.json

@@ -9,7 +9,8 @@
     "langchain",
     "examples",
     "docs",
-    "test-exports"
+    "test-exports",
+    "test-exports-cf"
   ],
   "repository": {
     "type": "git",
@@ -40,7 +41,8 @@
     "husky": "^8.0.3",
     "lint-staged": "^13.1.1",
     "prettier": "^2.8.3",
-    "typescript": "^4.9.5"
+    "typescript": "^4.9.5",
+    "wrangler": "^2.14.0"
   },
   "dependencies": {
     "turbo": "^1.7.4"

test-exports-cf/.gitignore

@@ -0,0 +1 @@
+.dev.vars

test-exports-cf/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "test-exports-cf",
+  "version": "0.0.0",
+  "devDependencies": {
+    "@cloudflare/workers-types": "^4.20230321.0",
+    "typescript": "^5.0.3",
+    "vitest": "^0.29.8",
+    "wrangler": "2.14.0"
+  },
+  "private": true,
+  "scripts": {
+    "start": "wrangler dev",
+    "deploy": "wrangler publish",
+    "test": "vitest"
+  }
+}

test-exports-cf/src/index.test.ts

@@ -0,0 +1,25 @@
+import { unstable_dev } from "wrangler";
+import type { UnstableDevWorker } from "wrangler";
+import { describe, expect, it, beforeAll, afterAll } from "vitest";
+
+describe("Worker", () => {
+  let worker: UnstableDevWorker;
+
+  beforeAll(async () => {
+    worker = await unstable_dev("src/index.ts", {
+      experimental: { disableExperimentalWarning: true },
+    });
+  });
+
+  afterAll(async () => {
+    await worker.stop();
+  });
+
+  it("should return Hello World", async () => {
+    const resp = await worker.fetch();
+    if (resp) {
+      const text = await resp.text();
+      expect(text.startsWith("Hello")).toBe(true);
+    }
+  });
+});

test-exports-cf/src/index.ts

@@ -0,0 +1,50 @@
+/**
+ * Welcome to Cloudflare Workers! This is your first worker.
+ *
+ * - Run `wrangler dev src/index.ts` in your terminal to start a development server
+ * - Open a browser tab at http://localhost:8787/ to see your worker in action
+ * - Run `wrangler publish src/index.ts --name my-worker` to publish your worker
+ *
+ * Learn more at https://developers.cloudflare.com/workers/
+ */
+
+import { LLMChain } from "langchain/chains";
+import { ChatOpenAI } from "langchain/chat_models";
+import {
+  ChatPromptTemplate,
+  HumanMessagePromptTemplate,
+} from "langchain/prompts";
+
+export interface Env {
+  OPENAI_API_KEY: string;
+
+  // Example binding to KV. Learn more at https://developers.cloudflare.com/workers/runtime-apis/kv/
+  // MY_KV_NAMESPACE: KVNamespace;
+  //
+  // Example binding to Durable Object. Learn more at https://developers.cloudflare.com/workers/runtime-apis/durable-objects/
+  // MY_DURABLE_OBJECT: DurableObjectNamespace;
+  //
+  // Example binding to R2. Learn more at https://developers.cloudflare.com/workers/runtime-apis/r2/
+  // MY_BUCKET: R2Bucket;
+  //
+  // Example binding to a Service. Learn more at https://developers.cloudflare.com/workers/runtime-apis/service-bindings/
+  // MY_SERVICE: Fetcher;
+}
+
+export default {
+  async fetch(
+    request: Request,
+    env: Env,
+    ctx: ExecutionContext
+  ): Promise<Response> {
+    const openai = new ChatOpenAI({ openAIApiKey: env.OPENAI_API_KEY });
+    const chain = new LLMChain({
+      llm: openai,
+      prompt: ChatPromptTemplate.fromPromptMessages([
+        HumanMessagePromptTemplate.fromTemplate("{input}"),
+      ]),
+    });
+    const res = await chain.run("hello");
+    return new Response(`Hello, from ${request.url}. Assistant says: ${res}`);
+  },
+};

test-exports-cf/tsconfig.json

@@ -0,0 +1,97 @@
+{
+	"compilerOptions": {
+		/* Visit https://aka.ms/tsconfig.json to read more about this file */
+		/* Projects */
+		// "incremental": true,                              /* Enable incremental compilation */
+		// "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
+		// "tsBuildInfoFile": "./",                          /* Specify the folder for .tsbuildinfo incremental compilation files. */
+		// "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects */
+		// "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
+		// "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
+		/* Language and Environment */
+		"target": "es2021" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
+		"lib": [
+			"es2021"
+		] /* Specify a set of bundled library declaration files that describe the target runtime environment. */,
+		"jsx": "react" /* Specify what JSX code is generated. */,
+		// "experimentalDecorators": true,                   /* Enable experimental support for TC39 stage 2 draft decorators. */
+		// "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
+		// "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h' */
+		// "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
+		// "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using `jsx: react-jsx*`.` */
+		// "reactNamespace": "",                             /* Specify the object invoked for `createElement`. This only applies when targeting `react` JSX emit. */
+		// "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
+		// "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
+		/* Modules */
+		"module": "es2022" /* Specify what module code is generated. */,
+		// "rootDir": "./",                                  /* Specify the root folder within your source files. */
+		"moduleResolution": "node" /* Specify how TypeScript looks up a file from a given module specifier. */,
+		// "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
+		// "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
+		// "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
+		// "typeRoots": [],                                  /* Specify multiple folders that act like `./node_modules/@types`. */
+		"types": [
+			"@cloudflare/workers-types"
+		] /* Specify type package names to be included without being referenced in a source file. */,
+		// "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
+		"resolveJsonModule": true /* Enable importing .json files */,
+		// "noResolve": true,                                /* Disallow `import`s, `require`s or `<reference>`s from expanding the number of files TypeScript should add to a project. */
+		/* JavaScript Support */
+		"allowJs": true /* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files. */,
+		"checkJs": false /* Enable error reporting in type-checked JavaScript files. */,
+		// "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from `node_modules`. Only applicable with `allowJs`. */
+		/* Emit */
+		// "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+		// "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
+		// "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
+		// "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
+		// "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If `declaration` is true, also designates a file that bundles all .d.ts output. */
+		// "outDir": "./",                                   /* Specify an output folder for all emitted files. */
+		// "removeComments": true,                           /* Disable emitting comments. */
+		"noEmit": true /* Disable emitting files from a compilation. */,
+		// "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
+		// "importsNotUsedAsValues": "remove",               /* Specify emit/checking behavior for imports that are only used for types */
+		// "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
+		// "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
+		// "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
+		// "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
+		// "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
+		// "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
+		// "newLine": "crlf",                                /* Set the newline character for emitting files. */
+		// "stripInternal": true,                            /* Disable emitting declarations that have `@internal` in their JSDoc comments. */
+		// "noEmitHelpers": true,                            /* Disable generating custom helper functions like `__extends` in compiled output. */
+		// "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
+		// "preserveConstEnums": true,                       /* Disable erasing `const enum` declarations in generated code. */
+		// "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
+		// "preserveValueImports": true,                     /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
+		/* Interop Constraints */
+		"isolatedModules": true /* Ensure that each file can be safely transpiled without relying on other imports. */,
+		"allowSyntheticDefaultImports": true /* Allow 'import x from y' when a module doesn't have a default export. */,
+		// "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */,
+		// "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
+		"forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,
+		/* Type Checking */
+		"strict": true /* Enable all strict type-checking options. */,
+		// "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied `any` type.. */
+		// "strictNullChecks": true,                         /* When type checking, take into account `null` and `undefined`. */
+		// "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
+		// "strictBindCallApply": true,                      /* Check that the arguments for `bind`, `call`, and `apply` methods match the original function. */
+		// "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
+		// "noImplicitThis": true,                           /* Enable error reporting when `this` is given the type `any`. */
+		// "useUnknownInCatchVariables": true,               /* Type catch clause variables as 'unknown' instead of 'any'. */
+		// "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
+		// "noUnusedLocals": true,                           /* Enable error reporting when a local variables aren't read. */
+		// "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read */
+		// "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
+		// "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
+		// "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
+		// "noUncheckedIndexedAccess": true,                 /* Include 'undefined' in index signature results */
+		// "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
+		// "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type */
+		// "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
+		// "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
+		/* Completeness */
+		// "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
+		"skipLibCheck": true /* Skip type checking all .d.ts files. */
+	}
+}

test-exports-cf/wrangler.toml

@@ -0,0 +1,3 @@
+name = "test-exports-cf"
+main = "src/index.ts"
+compatibility_date = "2023-04-05"