Fix stripping local debug code so can that dead-code-elimination produces smaller bundles with fewer function calls (part 1)

package.json

@@ -20,14 +20,14 @@
     "build": "dotenv -- turbo build",
     "build:control": "rollup -c rollup.config.mjs",
     "build:flags": "RETAIN_FLAGS=true ember build --env production --suppress-sizes",
-    "link:all": "esyes ./bin/link-all.mts",
     "clean": "node ./bin/clean.mjs",
+    "link:all": "esyes ./bin/link-all.mts",
     "lint": "npm-run-all lint:*",
     "lint:files": "turbo lint",
     "lint:format": "prettier -c .",
     "lint:types": "tsc -b",
     "lintfix": "pnpm turbo test:lint -- --fix && prettier -w .",
-    "start": "ember serve --port=7357",
+    "start": "vite",
     "test": "node bin/run-tests.mjs",
     "test:babel-plugins": "yarn workspace @glimmer/vm-babel-plugins test",
     "test:browserstack": "ember test --test-port=7774 --host 127.0.0.1 --config-file=testem-browserstack.js",

packages/@glimmer-workspace/build/index.d.ts

@@ -4,4 +4,3 @@ export {
   type PackageJSON,
   type ViteConfig as ViteExport,
 } from './lib/config.js';
-export { default as importMeta } from './lib/import-meta.js';

packages/@glimmer-workspace/build/index.js

@@ -1,3 +1,2 @@
 export { Package } from './lib/config.js';
-export { default as importMeta } from './lib/import-meta.js';
 export { default as inline } from './lib/inline.js';

packages/@glimmer-workspace/build/lib/config.js

@@ -1,7 +1,7 @@
 /* eslint-disable no-console */
 // @ts-check
-
 import { existsSync, readFileSync } from 'node:fs';
+import { createRequire } from 'node:module';
 import { dirname, resolve } from 'node:path';
 import { fileURLToPath } from 'node:url';
 
@@ -11,9 +11,10 @@ import * as insert from 'rollup-plugin-insert';
 import rollupTS from 'rollup-plugin-ts';
 import ts from 'typescript';
 
-import importMeta from './import-meta.js';
 import inline from './inline.js';
 
+const require = createRequire(import.meta.url);
+
 // eslint-disable-next-line import/no-named-as-default-member
 const { ModuleKind, ModuleResolutionKind, ScriptTarget, ImportsNotUsedAsValues } = ts;
 
@@ -96,7 +97,10 @@ export function typescript(pkg, config) {
   return rollupTS({
     transpiler: 'babel',
     transpileOnly: true,
-    babelConfig: { presets },
+    babelConfig: {
+      presets,
+      plugins: [require.resolve('@glimmer/local-debug-babel-plugin')],
+    },
     /**
      * This shouldn't be required, but it is.
      * If we use @rollup/plugin-babel, we can remove this.
@@ -108,7 +112,7 @@ export function typescript(pkg, config) {
 
 /** @type {['is' | 'startsWith', string[], 'inline' | 'external'][]} */
 const EXTERNAL_OPTIONS = [
-  ['is', ['tslib', '@glimmer/local-debug-flags'], 'inline'],
+  ['is', ['tslib', '@glimmer/local-debug-flags', '@glimmer/debug'], 'inline'],
   ['is', ['@handlebars/parser', 'simple-html-tokenizer', 'babel-plugin-debug-macros'], 'external'],
   ['startsWith', ['.', '/', '#', '@babel/runtime/', process.cwd().replace(/\\/gu, '/')], 'inline'],
   ['startsWith', ['@glimmer/', '@simple-dom/', '@babel/', 'node:'], 'external'],
@@ -315,7 +319,31 @@ export class Package {
         commonjs(),
         nodeResolve(),
         ...this.replacements(env),
-        ...(env === 'prod' ? [terser()] : []),
+        ...(env === 'prod'
+          ? [
+              terser({
+                module: true,
+                // to debug the output, uncomment this so you can read the
+                // identifiers, unchanged
+                // mangle: false,
+                compress: {
+                  passes: 3,
+                },
+              }),
+            ]
+          : [
+              terser({
+                module: true,
+                mangle: false,
+                compress: {
+                  passes: 3,
+                },
+                format: {
+                  comments: 'all',
+                  beautify: true,
+                },
+              }),
+            ]),
         postcss(),
         typescript(this.#package, {
           target: ScriptTarget.ES2022,
@@ -356,7 +384,20 @@ export class Package {
    */
   replacements(env) {
     return env === 'prod'
-      ? [importMeta]
+      ? [
+          replace({
+            preventAssignment: true,
+            values: {
+              // Intended to be left in the build during publish
+              // currently compiled away to `@glimmer/debug`
+              'import.meta.env.MODE': '"production"',
+              'import.meta.env.DEV': 'false',
+              'import.meta.env.PROD': 'true',
+              // Not exposed at publish, compiled away
+              'import.meta.env.VM_LOCAL_DEV': 'false',
+            },
+          }),
+        ]
       : [
           replace({
             preventAssignment: true,
@@ -417,10 +458,15 @@ export class Package {
 
       return {
         input: resolve(root, ts),
+        treeshake: {
+          // moduleSideEffects: false,
+          moduleSideEffects: (id, external) => !external,
+        },
         output: {
           file: resolve(root, 'dist', env, file),
           format,
           sourcemap: true,
+          hoistTransitiveImports: false,
           exports: format === 'cjs' ? 'named' : 'auto',
         },
         onwarn: (warning, warn) => {

packages/@glimmer-workspace/build/package.json

@@ -13,6 +13,7 @@
     "test:types": "tsc --noEmit -p ../tsconfig.json"
   },
   "dependencies": {
+    "@glimmer/local-debug-babel-plugin": "workspace:*",
     "@rollup/plugin-commonjs": "^25.0.7",
     "@rollup/plugin-node-resolve": "^15.2.3",
     "@rollup/plugin-replace": "^5.0.5",

packages/@glimmer/debug/index.ts

@@ -1,4 +1,54 @@
 export { debug, debugSlice, logOpcode } from './lib/debug';
-export * from './lib/metadata';
+export {
+  buildEnum,
+  buildMetas,
+  buildSingleMeta,
+  META_KIND,
+  normalize,
+  normalizeAll,
+  normalizeParsed,
+  OPERAND_TYPES,
+  strip,
+} from './lib/metadata';
 export { opcodeMetadata } from './lib/opcode-metadata';
-export * from './lib/stack-check';
+export {
+  check,
+  CheckArray,
+  CheckBlockSymbolTable,
+  CheckBoolean,
+  CheckDict,
+  CheckDocumentFragment,
+  CheckElement,
+  CheckFunction,
+  CheckHandle,
+  CheckInstanceof,
+  CheckInterface,
+  CheckMaybe,
+  CheckNode,
+  CheckNumber,
+  CheckObject,
+  CheckOption,
+  CheckOr,
+  CheckPrimitive,
+  CheckProgramSymbolTable,
+  CheckSafeString,
+  CheckString,
+  CheckUndefined,
+  CheckUnknown,
+  recordStackSize,
+  wrap,
+} from './lib/stack-check';
+
+// Types are optimized await automatically
+export type {
+  NormalizedMetadata,
+  NormalizedOpcodes,
+  Operand,
+  OperandList,
+  OperandName,
+  OperandType,
+  RawOperandFormat,
+  RawOperandMetadata,
+  Stack,
+} from './lib/metadata';
+export type { Checker } from './lib/stack-check';