fix[contracts]: Separately generate OVM typechain artifacts (#597)

* fix[contracts]: Generate typechain artifacts for ovm separately

* fix[contracts]: Add ovm typechain artifacts to package json

* chore[contracts]: Add changeset

* fix[contracts]: Revert change to package.json

* feat(hh-ovm): generate typechain bindings in specific directory
Co-authored-by: Georgios Konstantopoulos <me@gakonst.com>

.changeset/cuddly-geese-hope.md

+---
+"@eth-optimism/hardhat-ovm": minor
+---
+
+export ovm typechain bindings to types-ovm via hardhat-ovm

packages/contracts/package.json

@@ -5,6 +5,7 @@
   "files": [
     "dist/**/*.js",
     "dist/types/*.ts",
+    "dist/types-ovm/*.ts",
     "artifacts/**/*.json",
     "artifacts-ovm/**/*.json",
     "OVM",
@@ -24,6 +25,7 @@
     "build:contracts:ovm": "hardhat compile --network optimism",
     "build:dump": "ts-node \"bin/take-dump.ts\"",
     "build:typechain": "hardhat typechain",
+    "build:typechain:ovm": "hardhat --network optimism typechain",
     "test": "yarn run test:contracts",
     "test:contracts": "hardhat test --show-stack-traces",
     "test:gas": "hardhat test \"test/contracts/OVM/execution/OVM_StateManager.gas-spec.ts\" --no-compile --show-stack-traces",

packages/contracts/scripts/build.sh

 yarn run build:typescript & yarn run build:contracts
-yarn run build:contracts:ovm
+yarn run build:typescript:ovm & yarn run build:contracts:ovm

packages/hardhat-ovm/src/index.ts

@@ -192,5 +192,13 @@ extendEnvironment((hre) => {
     hre.config.paths.artifacts = artifactsPath
     hre.config.paths.cache = cachePath
     ;(hre as any).artifacts = new Artifacts(artifactsPath)
+
+    // if typechain is present, send the typed bindings to an ovm-specific
+    // directory
+    if ((hre.config as any).typechain) {
+      if (!(hre as any).config.typechain.outDir.endsWith('-ovm')) {
+        (hre as any).config.typechain.outDir += '-ovm'
+      }
+    }
   }
 })