From 6f7d17e5928bafdc530a268ee92e9e4953de6af8 Mon Sep 17 00:00:00 2001
From: Adam Hines <ahines@factset.com>
Date: Tue, 11 Oct 2022 13:04:21 -0600
Subject: [PATCH] chore(cache): cache tsconfig parsing to avoid the cost per
 vue file / interpolated string

---
 packages/vue2-jest/lib/utils.js | 12 +++++++++++-
 packages/vue3-jest/lib/utils.js | 13 +++++++++++--
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/packages/vue2-jest/lib/utils.js b/packages/vue2-jest/lib/utils.js
index 257af1ad..a6eb5d90 100644
--- a/packages/vue2-jest/lib/utils.js
+++ b/packages/vue2-jest/lib/utils.js
@@ -70,12 +70,18 @@ const getBabelOptions = function loadBabelOptions(filename, options = {}) {
   return loadPartialConfig(opts).options
 }
 
+const tsConfigCache = {}
+
 /**
  * Load TypeScript config from tsconfig.json.
  * @param {string | undefined} path tsconfig.json file path (default: root)
  * @returns {import('typescript').TranspileOptions | null} TypeScript compilerOptions or null
  */
 const getTypeScriptConfig = function getTypeScriptConfig(path) {
+  if (path in tsConfigCache) {
+    return tsConfigCache[path]
+  }
+
   ensureRequire('typescript', ['typescript'])
   const typescript = require('typescript')
 
@@ -103,12 +109,16 @@ const getTypeScriptConfig = function getTypeScriptConfig(path) {
 
   const compilerOptions = parsedConfig ? parsedConfig.options : {}
 
-  return {
+  const transpileConfig = {
     compilerOptions: {
       ...compilerOptions,
       module: typescript.ModuleKind.CommonJS
     }
   }
+
+  tsConfigCache[path] = transpileConfig
+
+  return transpileConfig
 }
 
 function isValidTransformer(transformer) {
diff --git a/packages/vue3-jest/lib/utils.js b/packages/vue3-jest/lib/utils.js
index e137e6ba..8a11be32 100644
--- a/packages/vue3-jest/lib/utils.js
+++ b/packages/vue3-jest/lib/utils.js
@@ -70,12 +70,18 @@ const getBabelOptions = function loadBabelOptions(filename, options = {}) {
   return loadPartialConfig(opts).options
 }
 
+const tsConfigCache = {}
+
 /**
  * Load TypeScript config from tsconfig.json.
  * @param {string | undefined} path tsconfig.json file path (default: root)
  * @returns {import('typescript').TranspileOptions | null} TypeScript compilerOptions or null
  */
 const getTypeScriptConfig = function getTypeScriptConfig(path) {
+  if (path in tsConfigCache) {
+    return tsConfigCache[path]
+  }
+
   ensureRequire('typescript', ['typescript'])
   const typescript = require('typescript')
 
@@ -103,14 +109,17 @@ const getTypeScriptConfig = function getTypeScriptConfig(path) {
 
   const compilerOptions = parsedConfig ? parsedConfig.options : {}
 
-  // Force es5 to prevent const vue_1 = require('vue') from conflicting
-  return {
+  const transpileConfig = {
     compilerOptions: {
       ...compilerOptions,
       target: typescript.ScriptTarget.ES5,
       module: typescript.ModuleKind.CommonJS
     }
   }
+
+  tsConfigCache[path] = transpileConfig
+
+  return transpileConfig
 }
 
 function isValidTransformer(transformer) {