optimize stat calls in resolvers (#1759)

* optimize stat calls in resolvers

* fix

Author: cspotcode

dist-raw/node-internal-modules-esm-resolve.js

@@ -2,21 +2,12 @@
 
 'use strict';
 
-const [nodeMajor, nodeMinor, nodePatch] = process.versions.node.split('.').map(s => parseInt(s, 10))
+const {versionGteLt} = require('../dist/util');
+
 // Test for node >14.13.1 || (>=12.20.0 && <13)
-const builtinModuleProtocol = nodeMajor > 14 || (
-    nodeMajor === 14 && (
-      nodeMinor > 13 || (
-        nodeMinor === 13 && nodePatch > 0
-      )
-    )
-  ) || (
-    nodeMajor === 12 && (
-      nodeMinor > 20 || (
-        nodeMinor === 20
-      )
-    )
-  )
+const builtinModuleProtocol =
+  versionGteLt(process.versions.node, '14.13.1') ||
+  versionGteLt(process.versions.node, '12.20.0', '13.0.0')
     ? 'node:'
     : 'nodejs:';
 
@@ -149,11 +140,20 @@ function getConditionsSet(conditions) {
 const realpathCache = new SafeMap();
 const packageJSONCache = new SafeMap();  /* string -> PackageConfig */
 
-function tryStatSync(path) {
+const statSupportsThrowIfNoEntry = versionGteLt(process.versions.node, '15.3.0') ||
+  versionGteLt(process.versions.node, '14.17.0', '15.0.0');
+const tryStatSync = statSupportsThrowIfNoEntry ? tryStatSyncWithoutErrors : tryStatSyncWithErrors;
+const statsIfNotFound = new Stats();
+function tryStatSyncWithoutErrors(path) {
+  const stats = statSync(path, { throwIfNoEntry: false });
+  if(stats != null) return stats;
+  return statsIfNotFound;
+}
+function tryStatSyncWithErrors(path) {
   try {
     return statSync(path);
   } catch {
-    return new Stats();
+    return statsIfNotFound;
   }
 }
 

dist-raw/node-internalBinding-fs.js

@@ -1,4 +1,5 @@
 const fs = require('fs');
+const {versionGteLt} = require('../dist/util');
 
 // In node's core, this is implemented in C
 // https://github.com/nodejs/node/blob/v15.3.0/src/node_file.cc#L891-L985
@@ -28,6 +29,17 @@ function internalModuleReadJSON(path) {
  * @returns {number} 0 = file, 1 = dir, negative = error
  */
 function internalModuleStat(path) {
+  const stat = fs.statSync(path, { throwIfNoEntry: false });
+  if(!stat) return -1;
+  if(stat.isFile()) return 0;
+  if(stat.isDirectory()) return 1;
+}
+
+/**
+ * @param {string} path
+ * @returns {number} 0 = file, 1 = dir, negative = error
+ */
+function internalModuleStatInefficient(path) {
   try {
     const stat = fs.statSync(path);
     if(stat.isFile()) return 0;
@@ -37,7 +49,10 @@ function internalModuleStat(path) {
   }
 }
 
+const statSupportsThrowIfNoEntry = versionGteLt(process.versions.node, '15.3.0') ||
+  versionGteLt(process.versions.node, '14.17.0', '15.0.0');
+
 module.exports = {
   internalModuleReadJSON,
-  internalModuleStat
+  internalModuleStat: statSupportsThrowIfNoEntry ? internalModuleStat : internalModuleStatInefficient
 };

src/bin.ts

@@ -4,7 +4,7 @@ import { join, resolve, dirname, parse as parsePath, relative } from 'path';
 import { inspect } from 'util';
 import Module = require('module');
 let arg: typeof import('arg');
-import { parse, createRequire, hasOwnProperty } from './util';
+import { parse, createRequire, hasOwnProperty, versionGteLt } from './util';
 import {
   EVAL_FILENAME,
   EvalState,
@@ -21,7 +21,6 @@ import {
   VERSION,
   TSError,
   register,
-  versionGteLt,
   createEsmHooks,
   createFromPreloadedConfig,
   DEFAULTS,

src/child/spawn-child.ts

@@ -2,7 +2,7 @@ import type { BootstrapState } from '../bin';
 import { spawn } from 'child_process';
 import { brotliCompressSync } from 'zlib';
 import { pathToFileURL } from 'url';
-import { versionGteLt } from '..';
+import { versionGteLt } from '../util';
 
 const argPrefix = '--brotli-base64-config=';
 

src/esm.ts

@@ -1,4 +1,4 @@
-import { register, RegisterOptions, Service, versionGteLt } from './index';
+import { register, RegisterOptions, Service } from './index';
 import {
   parse as parseUrl,
   format as formatUrl,
@@ -8,7 +8,7 @@ import {
 } from 'url';
 import { extname } from 'path';
 import * as assert from 'assert';
-import { normalizeSlashes } from './util';
+import { normalizeSlashes, versionGteLt } from './util';
 import { createRequire } from 'module';
 
 // Note: On Windows, URLs look like this: file:///D:/dev/@TypeStrong/ts-node-examples/foo.ts

src/file-extensions.ts

@@ -1,5 +1,6 @@
 import type * as _ts from 'typescript';
-import { RegisterOptions, versionGteLt } from '.';
+import type { RegisterOptions } from '.';
+import { versionGteLt } from './util';
 
 /**
  * Centralized specification of how we deal with file extensions based on

src/index.ts

@@ -17,6 +17,7 @@ import {
   parse,
   ProjectLocalResolveHelper,
   split,
+  versionGteLt,
   yn,
 } from './util';
 import { findAndReadConfig, loadCompiler } from './configuration';
@@ -66,33 +67,6 @@ export type {
 const engineSupportsPackageTypeField =
   parseInt(process.versions.node.split('.')[0], 10) >= 12;
 
-/** @internal */
-export function versionGteLt(
-  version: string,
-  gteRequirement: string,
-  ltRequirement?: string
-) {
-  const [major, minor, patch, extra] = parse(version);
-  const [gteMajor, gteMinor, gtePatch] = parse(gteRequirement);
-  const isGte =
-    major > gteMajor ||
-    (major === gteMajor &&
-      (minor > gteMinor || (minor === gteMinor && patch >= gtePatch)));
-  let isLt = true;
-  if (ltRequirement) {
-    const [ltMajor, ltMinor, ltPatch] = parse(ltRequirement);
-    isLt =
-      major < ltMajor ||
-      (major === ltMajor &&
-        (minor < ltMinor || (minor === ltMinor && patch < ltPatch)));
-  }
-  return isGte && isLt;
-
-  function parse(requirement: string) {
-    return requirement.split(/[\.-]/).map((s) => parseInt(s, 10));
-  }
-}
-
 /**
  * Assert that script can be loaded as CommonJS when we attempt to require it.
  * If it should be loaded as ESM, throw ERR_REQUIRE_ESM like node does.

src/util.ts

@@ -169,3 +169,30 @@ export function once<Fn extends (...args: any[]) => any>(fn: Fn) {
   }
   return onceFn;
 }
+
+/** @internal */
+export function versionGteLt(
+  version: string,
+  gteRequirement: string,
+  ltRequirement?: string
+) {
+  const [major, minor, patch, extra] = parse(version);
+  const [gteMajor, gteMinor, gtePatch] = parse(gteRequirement);
+  const isGte =
+    major > gteMajor ||
+    (major === gteMajor &&
+      (minor > gteMinor || (minor === gteMinor && patch >= gtePatch)));
+  let isLt = true;
+  if (ltRequirement) {
+    const [ltMajor, ltMinor, ltPatch] = parse(ltRequirement);
+    isLt =
+      major < ltMajor ||
+      (major === ltMajor &&
+        (minor < ltMinor || (minor === ltMinor && patch < ltPatch)));
+  }
+  return isGte && isLt;
+
+  function parse(requirement: string) {
+    return requirement.split(/[\.-]/).map((s) => parseInt(s, 10));
+  }
+}