ESM/CJS work

- delete "type: module" from package.json (this broke CJS typescript consumers)
- give up on "fix-cjs" approach, and switch to tsup-produced bundles.
- ensure CJS is "index.CJS", and ESM is "index.MJS" to avoid ambiguity
- switch from "api-extractor" back to tsc for typings
- DRY up jest-specific tsconfigs
- run jest in both cjs and esm modes
- tweak integration tests to use package exports instead of relative paths
- run awash in regret that I didn't just support CJS. ESM is far too painful for no performance or ergonomic benefit, and supporting only ESM is a huge middle finger to people still "stuck" on CJS.

.github/workflows/build.yml

@@ -178,7 +178,7 @@ jobs:
           cache: "npm"
       - run: ls -laR ./prebuilds
       - run: npm ci
-      - run: npm run tsc
+      - run: npm run prepare-release
 
       # readme: https://github.com/actions/checkout?tab=readme-ov-file#push-a-commit-using-the-built-in-token
       # https://chatgpt.com/share/6761e017-9950-800e-ba1e-94d575010f2d

eslint.config.mjs

@@ -5,14 +5,14 @@ import ts_eslint from "typescript-eslint";
 /** @type {import('eslint').Linter.Config[]} */
 export default [
   {
-    files: ["src/**/*.ts", "scripts/*.js", "*.js"],
+    files: ["src/**/*.ts", "scripts/*.js"],
     languageOptions: {
       globals: {
         ...globals.node,
       },
     },
   },
-  { ignores: [".tsup", "build", "coverage", "dist*", "docs"] },
+  { ignores: ["build", "coverage", "dist", "docs", "*.cts", "*.cjs"] },
   pluginJs.configs.recommended,
   ...ts_eslint.configs.recommended,
   ...ts_eslint.configs.strict,

jest.config.cjs

@@ -0,0 +1,33 @@
+// @ts-check
+
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+
+const config = {
+  displayName: "@photostructure/fs-metadata (CJS)",
+  testEnvironment: "jest-environment-node",
+  roots: ["<rootDir>/src"],
+  coverageProvider: "v8",
+  moduleNameMapper: {
+    "^(\\.{1,2}/.*)\\.js$": "$1",
+  },
+  transform: {
+    "^.+\\.(c)?ts$": [
+      "ts-jest",
+      {
+        useESM: false,
+        tsconfig: "tsconfig.jest-cjs.json",
+      },
+    ],
+  },
+  moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
+  collectCoverage: false,
+  verbose: true,
+  silent: false,
+  randomize: true,
+  setupFilesAfterEnv: [
+    "jest-extended/all",
+    "<rootDir>/src/test-utils/jest-matchers.ts",
+  ],
+};
+
+module.exports = config;

jest.config.mjs

@@ -7,24 +7,25 @@ const otherPlatforms = ["linux", "darwin", "windows"]
   .map((ea) => `/${ea}/`);
 
 /** @type {import('ts-jest').JestConfigWithTsJest} */
+
 const config = {
-  displayName: "@photostructure/fs-metadata",
+  displayName: "@photostructure/fs-metadata (ESM)",
   testEnvironment: "jest-environment-node",
   roots: ["<rootDir>/src"],
   coverageProvider: "v8",
   moduleNameMapper: {
     "^(\\.{1,2}/.*)\\.js$": "$1",
   },
   transform: {
-    "^.+\\.tsx?$": [
+    "^.+\\.(m)?ts$": [
       "ts-jest",
       {
         useESM: true,
-        tsconfig: "tsconfig.json",
+        tsconfig: "tsconfig.jest-esm.json",
       },
     ],
   },
-  extensionsToTreatAsEsm: [".ts"],
+  extensionsToTreatAsEsm: [".ts", ".mts"],
   moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
   collectCoverage:
     argv.includes("--coverage") && !argv.includes("--no-coverage"),
@@ -33,7 +34,6 @@ const config = {
   collectCoverageFrom: ["src/**/*.ts"],
   coveragePathIgnorePatterns: [
     "debuglog",
-    "\\.test\\.ts$",
     "/test-utils/",
     "/types/",
     ...otherPlatforms,