chore: group deprecated rnpm warnings, add migration guide

README.md

@@ -17,10 +17,11 @@ This CLI is intended to be used with a certain version of React Native. You'll f
 
 ## Documentation
 
+- [configuration](./docs/configuration.md)
 - [commands](./docs/commands.md)
+- [plugins](./docs/plugins.md)
 - [init](./docs/init.md)
 - [autolinking](./docs/autolinking.md)
-- [plugins](./docs/plugins.md)
 
 ## About
 

docs/configuration.md

@@ -14,3 +14,107 @@ Check the documentation for
 - [plugins](./plugins.md)
 
 to learn more about different types of configuration and features available.
+
+## Migration guide
+
+`"rnpm"` is deprecated and support for it will be removed in next major version of the CLI.
+
+> **Important**: Proceed further only if your project uses `"rnpm"` in `package.json`.
+
+There are different kinds of React Native projects, including apps, libraries and platforms. For each we prepared a brief "before & after" of the configuration shape with legacy `"rnpm"` and current `react-native.config.js`. Please mind that all configuration entries are optional.
+
+### Apps
+
+`package.json` entry:
+
+```json
+{
+  "rnpm": {
+    "ios": {},
+    "android": {},
+    "assets": ["./path-to-assets"],
+    "plugin": "./path-to-commands.js"
+  }
+}
+```
+
+becomes `react-native.config.js`
+
+```js
+module.exports = {
+  project: {
+    ios: {},
+    android: {}, // grouped into "project"
+  },
+  assets: ['./path-to-assets'], // stays the same
+  commands: require('./path-to-commands.js'), // formerly "plugin", returns an array of commands
+};
+```
+
+### Libraries
+
+`package.json` entry:
+
+```json
+{
+  "rnpm": {
+    "ios": {},
+    "android": {},
+    "assets": ["./path-to-assets"],
+    "hooks": {
+      "prelink": "./path-to-a-prelink-hook"
+    }
+  }
+}
+```
+
+becomes `react-native.config.js`:
+
+```js
+module.exports = {
+  // config for a library is scoped under "dependency" key
+  dependency: {
+    platforms: {
+      ios: {},
+      android: {}, // projects are grouped into "platforms"
+    },
+    assets: ['./path-to-assets'], // stays the same
+    // hooks are considered anti-pattern, please avoid them
+    hooks: {
+      prelink: './path-to-a-prelink-hook',
+    },
+  },
+};
+```
+
+You'll find more details in [dependencies](./dependencies.md) docs.
+
+### Out-of-tree platforms
+
+`package.json` entry:
+
+```json
+{
+  "rnpm": {
+    "haste": {
+      "platforms": ["windows"],
+      "providesModuleNodeModules": ["react-native-windows"]
+    },
+    "platform": "./local-cli/platform.js"
+  }
+}
+```
+
+becomes `react-native.config.js`
+
+```js
+module.exports = {
+  platforms: {
+    // grouped under "platforms" entry
+    windows: require('./local-cli/platform.js').windows,
+  },
+  // "haste" is no longer needed
+};
+```
+
+You'll find more details in [platforms](./platforms.md) docs.

packages/cli/src/tools/config/index.js

@@ -95,13 +95,23 @@ function loadConfig(projectRoot: string = process.cwd()): ConfigT {
     },
   };
 
+  let depsWithWarnings = [];
+
   const finalConfig = findDependencies(projectRoot).reduce(
     (acc: ConfigT, dependencyName) => {
       let root;
       let config;
       try {
         root = resolveNodeModuleDir(projectRoot, dependencyName);
-        config = readDependencyConfigFromDisk(root);
+        const output = readDependencyConfigFromDisk(root);
+        config = output.config;
+
+        if (output.legacy) {
+          const pkg = require(path.join(root, 'package.json'));
+          const link =
+            pkg.homepage || `https://npmjs.com/package/${dependencyName}`;
+          depsWithWarnings.push([dependencyName, link]);
+        }
       } catch (error) {
         logger.warn(
           inlineString(`
@@ -172,6 +182,21 @@ function loadConfig(projectRoot: string = process.cwd()): ConfigT {
     initialConfig,
   );
 
+  if (depsWithWarnings.length) {
+    logger.warn(
+      `The following packages use deprecated "rnpm" config that will stop working from next release:\n${depsWithWarnings
+        .map(
+          ([name, link]) =>
+            `  - ${chalk.bold(name)}: ${chalk.dim(chalk.underline(link))}`,
+        )
+        .join(
+          '\n',
+        )}\nPlease notify their maintainers about it. You can find more details at ${chalk.dim.underline(
+        'https://react-native-community/cli/docs/configuration.md#migration-guide',
+      )}.`,
+    );
+  }
+
   return finalConfig;
 }
 

packages/cli/src/tools/config/readConfigFromDisk.js

@@ -93,14 +93,15 @@ export function readConfigFromDisk(rootFolder: string): UserConfigT {
  */
 export function readDependencyConfigFromDisk(
   rootFolder: string,
-): UserDependencyConfigT {
+): {config: UserDependencyConfigT, legacy?: boolean} {
   const explorer = cosmiconfig('react-native', {
     stopDir: rootFolder,
     searchPlaces,
   });
 
-  const {config} = explorer.searchSync(rootFolder) || {
+  const {config, legacy} = explorer.searchSync(rootFolder) || {
     config: readLegacyDependencyConfigFromDisk(rootFolder),
+    legacy: true,
   };
 
   const result = Joi.validate(config, schema.dependencyConfig);
@@ -109,7 +110,7 @@ export function readDependencyConfigFromDisk(
     throw new JoiError(result.error);
   }
 
-  return result.value;
+  return {config: result.value, legacy: legacy && config !== undefined};
 }
 
 /**
@@ -139,7 +140,7 @@ const loadProjectCommands = (
 function readLegacyDependencyConfigFromDisk(
   rootFolder: string,
 ): ?UserDependencyConfigT {
-  const {rnpm: config, name} = require(path.join(rootFolder, 'package.json'));
+  const {rnpm: config} = require(path.join(rootFolder, 'package.json'));
 
   if (!config) {
     return undefined;
@@ -162,11 +163,5 @@ function readLegacyDependencyConfigFromDisk(
       : {},
   };
 
-  logger.warn(
-    `Package "${chalk.bold(
-      path.basename(name),
-    )}" is using deprecated "rnpm" config that will stop working from next release. Please notify its maintainers about it.`,
-  );
-
   return transformedConfig;
 }