feat(config/jest): add swc_mut_cjs_exports plugin to SWC configuration

In an effort to make the SWC-based Jest compilation as backward
compatible as possible, add the `swc_mut_cjs_exports` plugin so that
Jest spies work in all the places they used to work.

See: https://github.com/magic-akari/swc_mut_cjs_exports

.gitignore

@@ -14,4 +14,6 @@ dist
 !.yarn/plugins
 !.yarn/sdks
 !.yarn/versions
-.pnp.*
+.pnp.*
+
+.swc/

package.json

@@ -51,8 +51,8 @@
     "@commitlint/config-conventional": "^17.8.1",
     "@commitlint/prompt": "^17.8.1",
     "@swc-node/jest": "^1.5.6",
-    "@swc/core": "^1.3.38",
-    "@swc/helpers": "^0.4.14",
+    "@swc/core": "^1.3.102",
+    "@swc/helpers": "^0.5.3",
     "@types/jest": "^29.5.4",
     "@types/lodash.has": "^4.5.8",
     "@types/mkdirp": "^1.0.2",
@@ -85,10 +85,12 @@
     "jest-watch-typeahead": "^2.2.2",
     "lint-staged": "^15.1.0",
     "lodash.has": "^4.5.2",
+    "lodash.merge": "^4.6.2",
     "mkdirp": "^2.1.3",
     "prettier": "^2.8.8",
     "read-pkg-up": "^7.0.1",
     "rimraf": "^4.1.1",
+    "swc_mut_cjs_exports": "^0.86.17",
     "tslib": "^2.6.2",
     "typescript": "^4.9.5",
     "which": "^3.0.0",
@@ -130,6 +132,7 @@
     "@babel/core": "^7.23.2",
     "@babel/preset-env": "^7.23.2",
     "@types/cross-spawn": "^6.0.4",
+    "@types/lodash.merge": "^4",
     "depcheck": "^1.4.7",
     "eslint-config-kentcdodds": "^20.5.0",
     "husky": "^8.0.3",

src/config/jest.config.js

@@ -1,5 +1,12 @@
 /** @typedef {import('@jest/types').Config.InitialOptions} JestConfig */
+/** @typedef {import('@swc-node/core').Options} SwcNodeOptions */
 
+const {dirname} = require('path')
+const merge = require('lodash.merge')
+const {
+  readDefaultTsConfig,
+  tsCompilerOptionsToSwcConfig,
+} = require('@swc-node/register/read-default-tsconfig')
 const {ifAnyDep, hasFile, fromRoot, hasDevDep} = require('../utils')
 
 const {
@@ -17,6 +24,23 @@ const ignores = [
   '__mocks__',
 ]
 
+/**
+ * Get the path at which `@hover/javascript/jest` is installed in a dependent
+ * project in order to resolve the Jest preset as sometimes package managers
+ * nest the preset installation within the `@hover/javascript` installation.
+ * 
+ * @returns 
+ */
+const getResolvePaths = () => {
+  try {
+    const nested = require.resolve('@hover/javascript/jest')
+
+    return {paths: [dirname(nested)]}
+  } catch {
+    return undefined
+  }
+}
+
 /** @type JestConfig */
 const jestConfig = {
   roots: [fromRoot('.')],
@@ -50,7 +74,33 @@ const jestConfig = {
           ],
         ),
       )
-    : {'^.+\\.(t|j)sx?$': [require.resolve('@swc-node/jest')]},
+    : {
+        '^.+\\.(t|j)sx?$': [
+          require.resolve('@swc-node/jest', getResolvePaths()),
+          /** @type {SwcNodeOptions} */ (
+            merge(tsCompilerOptionsToSwcConfig(readDefaultTsConfig(), ''), {
+              esModuleInterop: true,
+              module: 'commonjs',
+              swc: {
+                jsc: {
+                  target: 'es2020',
+                  experimental: {
+                    plugins: [[require.resolve('swc_mut_cjs_exports'), {}]],
+                  },
+                  parser: {
+                    syntax: 'typescript',
+                    tsx: true,
+                    decorators: false,
+                    dynamicimport: true,
+                  },
+                  loose: true,
+                  externalHelpers: false,
+                },
+              },
+            })
+          ),
+        ],
+      },
   coveragePathIgnorePatterns: [
     ...ignores,
     'src/(umd|cjs|esm)-entry.js$',

src/tsconfig.json

@@ -8,6 +8,7 @@
     "declarationMap": true,
     "emitDeclarationOnly": true,
     "outDir": "../dist",
-    "rootDir": "."
+    "rootDir": ".",
+    "skipLibCheck": true
   }
 }

yarn.lock

@@ -2223,6 +2223,7 @@ __metadata:
     "@types/cross-spawn": ^6.0.4
     "@types/jest": ^29.5.4
     "@types/lodash.has": ^4.5.8
+    "@types/lodash.merge": ^4
     "@types/mkdirp": ^1.0.2
     "@types/node": ^18.18.6
     "@types/rimraf": ^3.0.2
@@ -2257,12 +2258,14 @@ __metadata:
     jest-watch-typeahead: ^2.2.2
     lint-staged: ^15.1.0
     lodash.has: ^4.5.2
+    lodash.merge: ^4.6.2
     mkdirp: ^2.1.3
     npm-run-all: ^4.1.5
     prettier: ^2.8.8
     read-pkg-up: ^7.0.1
     rimraf: ^4.1.1
     slash: ^3.0.0
+    swc_mut_cjs_exports: ^0.86.17
     tslib: ^2.6.2
     typescript: ^4.9.5
     which: ^3.0.0
@@ -3269,6 +3272,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/lodash.merge@npm:^4":
+  version: 4.6.9
+  resolution: "@types/lodash.merge@npm:4.6.9"
+  dependencies:
+    "@types/lodash": "*"
+  checksum: d0dd6654547c9d8d905184d14aa5c2a37a1ed1c3204f5ab20b7d591a05f34859ef09d3b72c065e94ca1989abf9109eb8230f67c4d64a5768b1d65b9ed8baf8e7
+  languageName: node
+  linkType: hard
+
 "@types/lodash@npm:*":
   version: 4.14.181
   resolution: "@types/lodash@npm:4.14.181"
@@ -11358,6 +11370,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"swc_mut_cjs_exports@npm:^0.86.17":
+  version: 0.86.17
+  resolution: "swc_mut_cjs_exports@npm:0.86.17"
+  peerDependencies:
+    "@swc/core": ^1.3.58
+    "@swc/jest": ^0.2.26
+  checksum: 709e0b3d32ea6a70f12c29d6455454eb9b27f27708f57b0fb9eb76ce55c1876acec65a26f53d27b00a5e3a114afd28dad472e1b32be1d6d89d60563ec1cf9bc5
+  languageName: node
+  linkType: hard
+
 "symbol-tree@npm:^3.2.4":
   version: 3.2.4
   resolution: "symbol-tree@npm:3.2.4"