Make slow imports dynamic in hardhat-core

Author: schaable

packages/hardhat-core/src/internal/core/config/config-loading.ts

@@ -1,4 +1,5 @@
 import type StackTraceParserT from "stacktrace-parser";
+import type { ConfigValidationT } from "./config-validation";
 
 import chalk from "chalk";
 import debug from "debug";
@@ -20,7 +21,6 @@ import { getUserConfigPath } from "../project-structure";
 
 import { SUPPORTED_SOLIDITY_VERSION_RANGE } from "../../hardhat-network/stack-traces/constants";
 import { resolveConfig } from "./config-resolution";
-import { validateConfig, validateResolvedConfig } from "./config-validation";
 import { DEFAULT_SOLC_VERSION } from "./default-config";
 
 const log = debug("hardhat:core:config");
@@ -68,6 +68,8 @@ export function loadConfigAndTasks(
     showSolidityConfigWarnings: false,
   }
 ): { resolvedConfig: HardhatConfig; userConfig: HardhatUserConfig } {
+  const { validateConfig, validateResolvedConfig } =
+    require("./config-validation") as ConfigValidationT;
   let configPath =
     hardhatArguments !== undefined ? hardhatArguments.config : undefined;
 

packages/hardhat-core/src/internal/core/config/config-resolution.ts

@@ -1,4 +1,5 @@
-import cloneDeep from "lodash/cloneDeep";
+import type { LoDashStatic } from "lodash";
+
 import path from "path";
 import semver from "semver";
 
@@ -62,6 +63,7 @@ export function resolveConfig(
   userConfigPath: string,
   userConfig: HardhatUserConfig
 ): HardhatConfig {
+  const cloneDeep = require("lodash/cloneDeep") as LoDashStatic["cloneDeep"];
   userConfig = cloneDeep(userConfig);
 
   return {
@@ -77,6 +79,7 @@ export function resolveConfig(
 function resolveNetworksConfig(
   networksConfig: NetworksUserConfig = {}
 ): NetworksConfig {
+  const cloneDeep = require("lodash/cloneDeep") as LoDashStatic["cloneDeep"];
   const hardhatNetworkConfig = networksConfig[HARDHAT_NETWORK_NAME];
 
   const localhostNetworkConfig =
@@ -128,6 +131,7 @@ function normalizeHexString(str: string): string {
 function resolveHardhatNetworkConfig(
   hardhatNetworkConfig: HardhatNetworkUserConfig = {}
 ): HardhatNetworkConfig {
+  const cloneDeep = require("lodash/cloneDeep") as LoDashStatic["cloneDeep"];
   const clonedDefaultHardhatNetworkParams = cloneDeep(
     defaultHardhatNetworkParams
   );
@@ -246,6 +250,7 @@ function isHdAccountsConfig(
 function resolveHttpNetworkConfig(
   networkConfig: HttpNetworkUserConfig
 ): HttpNetworkConfig {
+  const cloneDeep = require("lodash/cloneDeep") as LoDashStatic["cloneDeep"];
   const accounts: HttpNetworkAccountsConfig =
     networkConfig.accounts === undefined
       ? defaultHttpNetworkParams.accounts
@@ -427,6 +432,7 @@ function resolveCompiler(compiler: SolcUserConfig): SolcConfig {
 }
 
 function resolveMochaConfig(userConfig: HardhatUserConfig): Mocha.MochaOptions {
+  const cloneDeep = require("lodash/cloneDeep") as LoDashStatic["cloneDeep"];
   return {
     ...cloneDeep(defaultMochaOptions),
     ...userConfig.mocha,

packages/hardhat-core/src/internal/core/config/config-validation.ts

@@ -1,8 +1,12 @@
 import type { HardhatConfig as HardhatConfigT } from "../../../types";
+import type {
+  Context,
+  ValidationError,
+  getFunctionName as getFunctionNameT,
+} from "io-ts/lib";
+import type { Reporter } from "io-ts/lib/Reporter";
 
 import * as t from "io-ts";
-import { Context, getFunctionName, ValidationError } from "io-ts/lib";
-import { Reporter } from "io-ts/lib/Reporter";
 
 import {
   HARDHAT_MEMPOOL_SUPPORTED_ORDERS,
@@ -17,8 +21,16 @@ import { hardforkGte, HardforkName } from "../../util/hardforks";
 import { HardhatNetworkChainUserConfig } from "../../../types/config";
 import { defaultHardhatNetworkParams } from "./default-config";
 
+export interface ConfigValidationT {
+  validateConfig: typeof validateConfig;
+  validateResolvedConfig: typeof validateResolvedConfig;
+}
+
 function stringify(v: any): string {
   if (typeof v === "function") {
+    const { getFunctionName } = require("io-ts/lib") as {
+      getFunctionName: typeof getFunctionNameT;
+    };
     return getFunctionName(v);
   }
   if (typeof v === "number" && !isFinite(v)) {

packages/hardhat-core/src/internal/sentry/transport.ts

@@ -1,4 +1,4 @@
-import { Event, Response } from "@sentry/node";
+import type { Event, Response } from "@sentry/node";
 import { spawn } from "child_process";
 import * as path from "path";