Replace tsup with ts-bridge (#247)

Thanks to `tsup`, we publish CommonJS- and ESM-compatible versions of
our libraries. However, there are two problems with our builds:

1. We produce two versions of JavaScript files, but we only produce one
version of TypeScript type declaration files (which happens to be
CommonJS-compatible). This violates best practices communicated both by
from the TypeScript team and also the "Are the Types Wrong" tool, which
both dictate that there be a 1-to-1 mapping between source and
declaration files. You can read more about this problem here:
<https://github.com/arethetypeswrong/arethetypeswrong.github.io/blob/main/docs/problems/FalseCJS.md>
2. `tsup` identifies and extracts common code to "chunk" files. These
make tree shaking possible, but make debugging difficult for our client
teams.

This commit replaces `tsup` with `ts-bridge`, which solves both of these
problems and more. It also adds `attw` to the `test` script so that we
ensure that we don't have incompatibilities with builds in the future.

package.json

@@ -13,22 +13,26 @@
   "sideEffects": false,
   "exports": {
     ".": {
-      "types": "./dist/types/index.d.ts",
-      "import": "./dist/index.mjs",
-      "require": "./dist/index.js"
+      "import": {
+        "types": "./dist/index.d.mts",
+        "default": "./dist/index.mjs"
+      },
+      "require": {
+        "types": "./dist/index.d.cts",
+        "default": "./dist/index.cjs"
+      }
     },
     "./package.json": "./package.json"
   },
-  "main": "./dist/index.js",
+  "main": "./dist/index.cjs",
   "module": "./dist/index.mjs",
-  "types": "./dist/types/index.d.ts",
+  "types": "./dist/index.d.cts",
   "files": [
     "dist"
   ],
   "scripts": {
-    "build": "tsup --clean && yarn build:types",
+    "build": "ts-bridge --project tsconfig.build.json --clean",
     "build:docs": "typedoc",
-    "build:types": "tsc --project tsconfig.build.json",
     "lint": "yarn lint:eslint && yarn lint:constraints && yarn lint:misc --check && yarn lint:dependencies --check && yarn lint:changelog",
     "lint:changelog": "auto-changelog validate --prettier",
     "lint:constraints": "yarn constraints",
@@ -37,19 +41,22 @@
     "lint:fix": "yarn lint:eslint --fix && yarn lint:constraints --fix && yarn lint:misc --write && yarn lint:dependencies && yarn lint:changelog",
     "lint:misc": "prettier '**/*.json' '**/*.md' '**/*.yml' '!.yarnrc.yml' --ignore-path .gitignore --no-error-on-unmatched-pattern",
     "prepack": "./scripts/prepack.sh",
-    "test": "jest && jest-it-up",
+    "test": "jest && jest-it-up && attw --pack",
     "test:watch": "jest --watch"
   },
   "devDependencies": {
+    "@arethetypeswrong/cli": "^0.15.3",
     "@lavamoat/allow-scripts": "^3.0.4",
     "@lavamoat/preinstall-always-fail": "^2.0.0",
     "@metamask/auto-changelog": "^3.4.3",
     "@metamask/eslint-config": "^12.2.0",
     "@metamask/eslint-config-jest": "^12.1.0",
     "@metamask/eslint-config-nodejs": "^12.1.0",
     "@metamask/eslint-config-typescript": "^12.1.0",
+    "@ts-bridge/cli": "^0.1.4",
+    "@ts-bridge/shims": "^0.1.1",
     "@types/jest": "^28.1.6",
-    "@types/node": "^16",
+    "@types/node": "^18.18",
     "@typescript-eslint/eslint-plugin": "^5.43.0",
     "@typescript-eslint/parser": "^5.43.0",
     "@yarnpkg/types": "^4.0.0-rc.52",
@@ -68,7 +75,6 @@
     "prettier-plugin-packagejson": "^2.3.0",
     "ts-jest": "^28.0.7",
     "ts-node": "^10.7.0",
-    "tsup": "^7.2.0",
     "typedoc": "^0.23.15",
     "typescript": "~4.8.4"
   },
@@ -82,8 +88,7 @@
   },
   "lavamoat": {
     "allowScripts": {
-      "@lavamoat/preinstall-always-fail": false,
-      "tsup>esbuild": true
+      "@lavamoat/preinstall-always-fail": false
     }
   }
 }

tsconfig.build.json

@@ -6,7 +6,7 @@
     "emitDeclarationOnly": true,
     "inlineSources": true,
     "noEmit": false,
-    "outDir": "dist/types",
+    "outDir": "dist",
     "rootDir": "src",
     "sourceMap": true
   },

yarn.config.cjs

@@ -253,20 +253,21 @@ module.exports = defineConfig({
     workspace.set('repository.type', 'git');
     workspace.set('repository.url', `${workspaceRepository}.git`);
 
-    // The package must specify a minimum Node.js version of 16.
+    // The package must specify a minimum Node.js version of 18.18.
     workspace.set('engines.node', '^18.18 || >=20');
 
-    // The package must specify a `types` entrypoint, and an `import`
-    // entrypoint.
-    workspace.set('types', './dist/types/index.d.ts');
-    workspace.set('exports["."].types', './dist/types/index.d.ts');
+    // The package must provide the location of the CommonJS-compatible
+    // entrypoint and its matching type declaration file.
+    workspace.set('main', './dist/index.cjs');
+    workspace.set('exports["."].require.default', './dist/index.cjs');
+    workspace.set('types', './dist/index.d.cts');
+    workspace.set('exports["."].require.types', './dist/index.d.cts');
 
-    // The package must specify a `main` and `module` entrypoint, and a
-    // `require` and `import` entrypoint.
-    workspace.set('main', './dist/index.js');
-    workspace.set('exports["."].require', './dist/index.js');
+    // The package must provide the location of the ESM-compatible JavaScript
+    // entrypoint and its matching type declaration file.
     workspace.set('module', './dist/index.mjs');
-    workspace.set('exports["."].import', './dist/index.mjs');
+    workspace.set('exports["."].import.default', './dist/index.mjs');
+    workspace.set('exports["."].import.types', './dist/index.d.mts');
 
     // The package must export a `package.json` file.
     workspace.set('exports["./package.json"]', './package.json');