client: add era dependency

Author: ScottyPoi

packages/client/package.json

@@ -54,6 +54,7 @@
     "@ethereumjs/devp2p": "7.0.0-alpha.1",
     "@ethereumjs/ethash": "4.0.0-alpha.1",
     "@ethereumjs/evm": "4.0.0-alpha.1",
+    "@ethereumjs/era": "1.0.0-alpha.1",
     "@ethereumjs/genesis": "0.3.0-alpha.1",
     "@ethereumjs/mpt": "7.0.0-alpha.1",
     "@ethereumjs/rlp": "6.0.0-alpha.1",

packages/client/tsconfig.prod.esm.json

@@ -12,6 +12,7 @@
     { "path": "../blockchain/tsconfig.prod.esm.json" },
     { "path": "../common/tsconfig.prod.esm.json" },
     { "path": "../devp2p/tsconfig.prod.esm.json" },
+    { "path": "../era/tsconfig.prod.esm.json" },
     { "path": "../rlp/tsconfig.prod.esm.json" },
     { "path": "../mpt/tsconfig.prod.esm.json" },
     { "path": "../tx/tsconfig.prod.esm.json" },