Get rid of warnings for dual esm and cjs packages of the same version

packages/util/src/versionDetect.spec.ts

@@ -3,7 +3,7 @@
 
 /// <reference types="@polkadot/dev-test/globals.d.ts" />
 
-import { detectPackage } from './versionDetect.js';
+import { detectPackage, POLKADOTJS_DISABLE_ESM_CJS_WARNING_FLAG } from './versionDetect.js';
 
 describe('detectPackage', (): void => {
   const PKG = '@polkadot/util';
@@ -70,3 +70,41 @@ The following conflicting packages were found:
     spy.mockRestore();
   });
 });
+
+describe('detectPackageEsmCjsNoWarnings', (): void => {
+  const PKG = '@polkadot/wasm-crypto';
+  const VER1 = '9.8.0-beta.45';
+  const PATH = '/Users/jaco/Projects/polkadot-js/api/node_modules/@polkadot/api/node_modules/@polkadot/wasm-crypto';
+
+  it('should not log when there are concurrent esm and cjs versions of the same package with the same version number and warnings are disabled', (): void => {
+    const spy = jest.spyOn(console, 'warn');
+    const pkgEsm = { name: PKG, path: PATH, type: 'esm', version: VER1 };
+    const pkgCjs = { name: PKG, path: `${PATH}/cjs`, type: 'cjs', version: VER1 };
+
+    process.env[POLKADOTJS_DISABLE_ESM_CJS_WARNING_FLAG] = '1';
+    detectPackage(pkgEsm, false, []);
+    detectPackage(pkgCjs, false, []);
+
+    expect(spy).not.toHaveBeenCalled();
+    spy.mockRestore();
+  });
+});
+
+describe('detectPackageEsmCjs', (): void => {
+  const PKG = '@polkadot/wasm-crypto-wasm';
+  const VER1 = '9.8.0-beta.45';
+  const PATH = '/Users/jaco/Projects/polkadot-js/api/node_modules/@polkadot/api/node_modules/@polkadot/wasm-crypto-wasm';
+
+  it('should log when there are concurrent esm and cjs versions of the same package with the same version number and warnings are not disabled', (): void => {
+    const spy = jest.spyOn(console, 'warn');
+    const pkgEsm = { name: PKG, path: PATH, type: 'esm', version: VER1 };
+    const pkgCjs = { name: PKG, path: `${PATH}/cjs`, type: 'cjs', version: VER1 };
+
+    process.env[POLKADOTJS_DISABLE_ESM_CJS_WARNING_FLAG] = undefined;
+    detectPackage(pkgEsm, false, []);
+    detectPackage(pkgCjs, false, []);
+
+    expect(spy).toHaveBeenCalled();
+    spy.mockRestore();
+  });
+});

packages/util/src/versionDetect.ts

@@ -26,6 +26,8 @@ type FnString = () => string | undefined;
 
 const DEDUPE = 'Either remove and explicitly install matching versions or dedupe using your package manager.\nThe following conflicting packages were found:';
 
+export const POLKADOTJS_DISABLE_ESM_CJS_WARNING_FLAG = 'POLKADOTJS_DISABLE_ESM_CJS_WARNING';
+
 /** @internal */
 function getEntry (name: string): VersionPath[] {
   const _global = xglobal as PjsGlobal;
@@ -105,7 +107,7 @@ function warn <T extends { version: string }> (pre: string, all: T[], fmt: (vers
 /**
  * @name detectPackage
  * @summary Checks that a specific package is only imported once
- * @description A `@polkadot/*` version detection utility, checking for one occurence of a package in addition to checking for ddependency versions.
+ * @description A `@polkadot/*` version detection utility, checking for one occurrence of a package in addition to checking for dependency versions.
  */
 export function detectPackage ({ name, path, type, version }: PackageInfo, pathOrFn?: FnString | string | false | null, deps: PackageInfo[] = []): void {
   if (!name.startsWith('@polkadot')) {
@@ -116,7 +118,14 @@ export function detectPackage ({ name, path, type, version }: PackageInfo, pathO
 
   entry.push({ path: getPath(path, pathOrFn), type, version });
 
-  if (entry.length !== 1) {
+  // if we have more than one entry at DIFFERENT version types then warn. If there is more than one entry at the same
+  // version and ESM/CJS dual warnings are disabled, then do not display warnings
+  const entriesSameVersion = entry.every((e) => e.version === version);
+  const esmCjsWarningDisabled = POLKADOTJS_DISABLE_ESM_CJS_WARNING_FLAG in process.env && process.env[POLKADOTJS_DISABLE_ESM_CJS_WARNING_FLAG] === '1';
+  const multipleEntries = entry.length !== 1;
+  const disableWarnings = esmCjsWarningDisabled && entriesSameVersion;
+
+  if (multipleEntries && !disableWarnings) {
     warn(`${name} has multiple versions, ensure that there is only one installed.`, entry, formatVersion);
   } else {
     const mismatches = deps.filter((d) => d && d.version !== version);