scripts[minor],docs[minor]: Add migration script to scripts package

docs/core_docs/docs/guides/migrating.mdx

@@ -0,0 +1,53 @@
+---
+title: Migrating to 0.1
+hide_table_of_contents: true
+---
+
+# Migration guide: 0.0 -> 0.1
+
+If you're still using the pre `0.1` version of LangChain, but want to upgrade to the latest version, we've created a script that can handle almost every aspect of the migration for you.
+
+At a high level, the changes from `0.0` to `0.1` are new packages and import path updates.
+We've done our best to keep all core code functionality the same, so migrating can be as painless as possible.
+
+In simple terms, this script will scan your TypeScript codebase for any imports from `langchain/*`, and if it finds imports which have been moved in `0.1`, it'll automatically update the import paths for you.
+
+The new packages it checks for are:
+
+- `@langchain/core`
+- `@langchain/community`
+- `@langchain/openai`
+- `@langchain/cohere`
+- `@langchain/pinecone`
+
+Some of these integration packages (not `core` or `community`) do have breaking changes. If you'd like to opt out of updating to those modules, you may pass in the `skipCheck` arg with a list of modules you'd like to ignore.
+
+For example, `@langchain/cohere` bumps to the new Cohere SDK version. If you do not wish to upgrade, it will instead update your `cohere` imports to the `@langchain/community` package which still contains the previous version of the Cohere SDK.
+
+The example below demonstrates how to run the migration script, checking all new packages.
+
+### Setup
+
+Install the new packages.
+
+import IntegrationInstallTooltip from "@mdx_components/integration_install_tooltip.mdx";
+import CodeBlock from "@theme/CodeBlock";
+import MigrationExample from "@examples/guides/migrating.ts";
+
+<IntegrationInstallTooltip></IntegrationInstallTooltip>
+
+Install the scripts package to import the migration script:
+
+```bash npm2yarn
+npm install @langchain/scripts
+```
+
+Then, install any integration packages you'd like to use:
+
+```bash npm2yarn
+npm install @langchain/core @langchain/community @langchain/openai @langchain/cohere @langchain/pinecone
+```
+
+Then, run the migration code as seen below.
+
+<CodeBlock language="typescript">{MigrationExample}</CodeBlock>

examples/package.json

@@ -41,6 +41,7 @@
     "@langchain/openai": "workspace:*",
     "@langchain/pinecone": "workspace:*",
     "@langchain/redis": "workspace:*",
+    "@langchain/scripts": "workspace:*",
     "@langchain/weaviate": "workspace:*",
     "@langchain/yandex": "workspace:*",
     "@opensearch-project/opensearch": "^2.2.0",

examples/src/guides/migrating.ts

@@ -0,0 +1,8 @@
+import { updateEntrypointsFrom0_0_xTo0_1_x } from "@langchain/scripts/migrations";
+
+await updateEntrypointsFrom0_0_xTo0_1_x({
+  // Path to the local langchainjs repository
+  localLangChainPath: "/Users/my-profile/langchainjs",
+  // Path to the repository where the migration should be applied
+  codePath: "/Users/my-profile/langchainjs-project",
+});

libs/langchain-scripts/.gitignore

@@ -4,6 +4,9 @@ index.d.ts
 build.cjs
 build.js
 build.d.ts
+migrations.cjs
+migrations.js
+migrations.d.ts
 node_modules
 dist
 .yarn

libs/langchain-scripts/package.json

@@ -38,7 +38,9 @@
   "license": "MIT",
   "dependencies": {
     "commander": "^11.1.0",
+    "glob": "^10.3.10",
     "rollup": "^4.5.2",
+    "ts-morph": "^21.0.1",
     "typescript": "<5.2.0"
   },
   "devDependencies": {
@@ -76,6 +78,11 @@
       "import": "./build.js",
       "require": "./build.cjs"
     },
+    "./migrations": {
+      "types": "./migrations.d.ts",
+      "import": "./migrations.js",
+      "require": "./migrations.cjs"
+    },
     "./package.json": "./package.json"
   },
   "files": [
@@ -85,6 +92,9 @@
     "index.d.ts",
     "build.cjs",
     "build.js",
-    "build.d.ts"
+    "build.d.ts",
+    "migrations.cjs",
+    "migrations.js",
+    "migrations.d.ts"
   ]
 }

libs/langchain-scripts/scripts/create-entrypoints.js

@@ -12,6 +12,7 @@ const DEFAULT_GITIGNORE_PATHS = ["node_modules", "dist", ".yarn"];
 const entrypoints = {
   index: "index",
   build: "build",
+  migrations: "migrations/index",
 };
 
 // Entrypoints in this list require an optional dependency to be installed.