Remove typed option loading

Summary: The API to load custom config types is no longer needed, and can be removed

Reviewed By: cpojer

Differential Revision: D5579721

fbshipit-source-id: f8bc117491134c1177cf17a84360524432579ab9

local-cli/util/Config.js

@@ -195,51 +195,30 @@ const Config = {
   }: ConfigT),
 
   find(startDir: string): ConfigT {
-    return Config.findCustom(startDir, Config.DEFAULTS);
-  },
-
-  /**
-   * This allows a callsite to grab a config that may have custom fields or
-   * a different version of the config. In that case the defaults have to be
-   * specified explicitely.
-   */
-  findCustom<TConfig: {}>(startDir: string, defaults: TConfig): TConfig {
-    return Config.findWithPathCustom(startDir, defaults).config;
+    return this.findWithPath(startDir).config;
   },
 
   findWithPath(startDir: string): {config: ConfigT, projectPath: string} {
-    return Config.findWithPathCustom(startDir, Config.DEFAULTS);
-  },
-
-  findWithPathCustom<TConfig: {}>(startDir: string, defaults: TConfig): {config: TConfig, projectPath: string} {
     const configPath = findConfigPath(startDir);
     invariant(
       configPath,
       `Can't find "${RN_CLI_CONFIG}" file in any parent folder of "${startDir}"`,
     );
     const projectPath = path.dirname(configPath);
-    return {config: Config.loadFileCustom(configPath, defaults), projectPath};
+    return {config: this.loadFile(configPath, startDir), projectPath};
   },
 
   findOptional(startDir: string): ConfigT {
-    return Config.findOptionalCustom(startDir, Config.DEFAULTS);
-  },
-
-  findOptionalCustom<TConfig: {}>(startDir: string, defaults: TConfig): TConfig {
     const configPath = findConfigPath(startDir);
     return configPath
-      ? Config.loadFileCustom(configPath, defaults)
-      : {...defaults};
+      ? this.loadFile(configPath, startDir)
+      : {...Config.DEFAULTS};
   },
 
   loadFile(pathToConfig: string): ConfigT {
-    return Config.loadFileCustom(pathToConfig, Config.DEFAULTS);
-  },
-
-  loadFileCustom<TConfig: {}>(pathToConfig: string, defaults: TConfig): TConfig {
-    // $FlowFixMe: necessary dynamic require
+    //$FlowFixMe: necessary dynamic require
     const config: {} = require(pathToConfig);
-    return {...defaults, ...config};
+    return {...Config.DEFAULTS, ...config};
   },
 };