Mark metro-file-map as experimental, rename hasteMapCacheDirectory -> fileMapCacheDirectory

Summary:
`metro-file-map` has not yet been part of an OSS Metro release. This marks it as "experimental" (i.e. semver-excluded), for as long as we're making regular changes to its API, which is typically only consumed by other Metro packages.

Additionally, this makes a top-level config name change `hasteMapCacheDirectory` -> `fileMapCacheDirectory`, to reflect `jest-haste-map` -> `metro-file-map`, while retaining support for `hasteMapCacheDirectory` as a deprecated alias.

Reviewed By: motiz88

Differential Revision: D36451806

fbshipit-source-id: 498271c1b4b6037cb567b5f87abee2f47b094916

Author: robhogan

docs/Configuration.md

@@ -99,11 +99,17 @@ Type: `number`
 
 The number of workers we should parallelize the transformer on.
 
-#### `hasteMapCacheDirectory`
+#### `fileMapCacheDirectory`
 
 Type: `string`
 
-The path to the haste map cache directory, defaults to `os.tmpdir()`.
+The path to the `metro-file-map` cache directory, defaults to `os.tmpdir()`.
+
+#### Deprecated: `hasteMapCacheDirectory`
+
+Type: `string`
+
+Alias of `fileMapCacheDirectory`
 
 ---
 ### Resolver Options

packages/metro-config/src/configTypes.flow.js

@@ -116,7 +116,8 @@ type TransformerConfigT = {
 type MetalConfigT = {
   cacheStores: $ReadOnlyArray<CacheStore<TransformResult<>>>,
   cacheVersion: string,
-  hasteMapCacheDirectory?: string,
+  fileMapCacheDirectory?: string,
+  hasteMapCacheDirectory?: string, // Deprecated, alias of fileMapCacheDirectory
   maxWorkers: number,
   projectRoot: string,
   stickyWorkers: boolean,

packages/metro-file-map/README.md

@@ -1,5 +1,12 @@
-# Metro File Map
+# \[Experimental\] Metro File Map
 
 🚇 File system crawling, watching and mapping for [Metro](https://facebook.github.io/metro/).
 
 Originally a fork of [`jest-haste-map`](https://github.com/facebook/jest/tree/main/packages/jest-haste-map).
+
+This entire package should be considered "experimental" for the time being -
+the API is considered internal and changes will not be semver-breaking.
+
+If you need to rely on `metro-file-map` APIs directly please
+[raise an issue](https://github.com/facebook/metro/issues/new) to discuss your
+use case.

packages/metro-file-map/package.json

@@ -1,7 +1,7 @@
 {
   "name": "metro-file-map",
   "version": "0.70.2",
-  "description": "🚇 File crawling, watching and mapping for Metro",
+  "description": "[Experimental] - 🚇 File crawling, watching and mapping for Metro",
   "main": "src/index.js",
   "repository": {
     "type": "git",

packages/metro/src/node-haste/DependencyGraph/createHasteMap.js

@@ -58,7 +58,8 @@ function createHasteMap(
   const computeDependencies = dependencyExtractor != null;
 
   return MetroFileMap.create({
-    cacheDirectory: config.hasteMapCacheDirectory,
+    cacheDirectory:
+      config.fileMapCacheDirectory ?? config.hasteMapCacheDirectory,
     computeDependencies,
     computeSha1: true,
     dependencyExtractor: config.resolver.dependencyExtractor,