hardhat-deploy-config: better api for other networks

Add ability to get other network's deploy configs, good
to pair with companion networks feature from hh deploy.

packages/hardhat-deploy-config/src/plugin.ts

@@ -7,7 +7,7 @@ import {
   HardhatRuntimeEnvironment,
   HardhatUserConfig,
 } from 'hardhat/types'
-import { lazyObject } from 'hardhat/plugins'
+import { lazyObject, lazyFunction } from 'hardhat/plugins'
 import { ethers } from 'ethers'
 
 // From: https://github.com/wighawag/hardhat-deploy/blob/master/src/index.ts#L63-L76
@@ -26,8 +26,10 @@ const normalizePath = (
   return userPath
 }
 
-export const loadDeployConfig = (hre: HardhatRuntimeEnvironment): any => {
-  const getDeployConfig = (dir: string, network: string): any => {
+const getDeployConfig = (
+  dir: string,
+  network: string
+): { [key: string]: any } => {
   let config: any
   try {
     const base = `${dir}/${network}`
@@ -42,20 +44,17 @@ export const loadDeployConfig = (hre: HardhatRuntimeEnvironment): any => {
     }
   } catch (err) {
     throw new Error(
-        `error while loading deploy config for network: ${hre.network.name}, ${err}`
+      `error while loading deploy config for network: ${network}, ${err}`
     )
   }
   return config
-  }
+}
 
+export const loadDeployConfig = (hre: HardhatRuntimeEnvironment): any => {
   const paths = hre.config.paths.deployConfig
   const conf = getDeployConfig(paths, hre.network.name)
   const spec = parseDeployConfig(hre, conf)
 
-  spec.getDeployConfig = (network: string) => {
-    return getDeployConfig(paths, network)
-  }
-
   return new Proxy(spec, {
     get: (target, prop) => {
       if (target.hasOwnProperty(prop)) {
@@ -124,4 +123,8 @@ extendConfig(
 
 extendEnvironment((hre) => {
   hre.deployConfig = lazyObject(() => loadDeployConfig(hre))
+  hre.getDeployConfig = lazyFunction(() => {
+    const paths = hre.config.paths.deployConfig
+    return (network: string) => getDeployConfig(paths, network)
+  })
 })

packages/hardhat-deploy-config/src/type-extensions.ts

@@ -25,7 +25,7 @@ declare module 'hardhat/types/runtime' {
   interface HardhatRuntimeEnvironment {
     deployConfig: {
       [key: string]: any
-      getDeployConfig(arg0: string): { [key: string]: any }
     }
+    getDeployConfig(network: string): { [key: string]: any }
   }
 }